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ASTM D8375-22

(Test Method)

Standard Test Method for Determination of Cannabinoid Concentration in Dried Cannabis and Hemp Raw Materials using Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)

Standard Test Method for Determination of Cannabinoid Concentration in Dried Cannabis and Hemp Raw Materials using Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)

SIGNIFICANCE AND USE
5.1 The analysis and reporting of cannabinoid content in cannabis and hemp is required to address human health and safety concerns, satisfy testing and labeling requirements, and meet the regulatory guidelines of various jurisdictions. This test method is useful in providing quantitative results for up to seventeen cannabinoids in dried cannabis and hemp raw material samples.
SCOPE
1.1 This test method allows for the concentration determination of the cannabinoids listed in Table 1, and shall apply to any dried raw material from a cannabis plant (Note 1, Note 2) regardless of the type of cannabis plant from which it was derived.2 For the sake of brevity, the term “cannabis” shall be used from now on to refer to any type of cannabis plant including those that can be classified as hemp. The procedure includes sub-sampling a ground, homogeneous sample, extraction with methanol:water (80:20, v:v),3,4 dilution in methanol and analysis by liquid chromatography tandem mass spectrometry (LC-MS/MS). The method allows for a wide-range of sample concentrations to be determined by using a 1000-fold calibration range and the option to perform multiple levels of sample dilution. The calibration curve is prepared in methanol over a range of 10 ng/mL to 10 000 ng/mL for all seventeen cannabinoids, or a subset of cannabinoids if desired, while the sample extracts are diluted in methanol into the calibration range.3,4,5 For example, a 1/500 dilution of sample extracts allows concentration determination over a range of 0.5 mg/g to 500 mg/g in cannabis. The method was validated with quality control samples prepared in methanol, a candidate certified reference material (CRM), and repeat analysis of cannabinoid samples.3  
Note 1: For this test method, dried raw material from a cannabis plant includes one or more of inflorescence, leaves, or stems.
Note 2: Certain jurisdictions or regulations may require specific parts of the plant to be included or excluded for analysis and those regulations will take precedence for the selection of plant parts.  
1.2 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 List of Measurable Analytes—See Table 1.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Historical
Publication Date
31-Jul-2022
ICS
11.120.99 - Other standards related to pharmaceutics
Technical Committee
D37 - Cannabis
Drafting Committee
D37.03 - Laboratory
Current Stage
Ref Project

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ASTM D8375-22 - Standard Test Method for Determination of Cannabinoid Concentration in Dried Cannabis and Hemp Raw Materials using Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)ASTM D8375-22 - Standard Test Method for Determination of Cannabinoid Concentration in Dried Cannabis and Hemp Raw Materials using Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)
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ASTM D8375-22 - Standard Test Method for Determination of Cannabinoid Concentration in Dried Cannabis and Hemp Raw Materials using Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D8375 − 22
Standard Test Method for
Determination of Cannabinoid Concentration in Dried
Cannabis and Hemp Raw Materials using Liquid
1
Chromatography Tandem Mass Spectrometry (LC-MS/MS)
This standard is issued under the fixed designation D8375; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
includes one or more of inflorescence, leaves, or stems.
1. Scope
NOTE 2—Certain jurisdictions or regulations may require specific parts
1.1 This test method allows for the concentration determi-
of the plant to be included or excluded for analysis and those regulations
nation of the cannabinoids listed in Table 1, and shall apply to
will take precedence for the selection of plant parts.
any dried raw material from a cannabis plant (Note 1, Note 2)
1.2 Units—The values stated in SI units are to be regarded
regardless of the type of cannabis plant from which it was
as standard. No other units of measurement are included in this
2
derived. For the sake of brevity, the term “cannabis” shall be
standard.
used from now on to refer to any type of cannabis plant
1.3 List of Measurable Analytes—See Table 1.
including those that can be classified as hemp. The procedure
1.4 This standard does not purport to address all of the
includes sub-sampling a ground, homogeneous sample, extrac-
3,4
safety concerns, if any, associated with its use. It is the
tion with methanol:water (80:20, v:v), dilution in methanol
responsibility of the user of this standard to establish appro-
and analysis by liquid chromatography tandem mass spectrom-
priate safety, health, and environmental practices and deter-
etry (LC-MS/MS). The method allows for a wide-range of
mine the applicability of regulatory limitations prior to use.
sample concentrations to be determined by using a 1000-fold
1.5 This international standard was developed in accor-
calibration range and the option to perform multiple levels of
dance with internationally recognized principles on standard-
sample dilution. The calibration curve is prepared in methanol
ization established in the Decision on Principles for the
over a range of 10 ng ⁄mL to 10 000 ng/mL for all seventeen
Development of International Standards, Guides and Recom-
cannabinoids, or a subset of cannabinoids if desired, while the
mendations issued by the World Trade Organization Technical
sample extracts are diluted in methanol into the calibration
3,4,5
Barriers to Trade (TBT) Committee.
range. For example, a 1/500 dilution of sample extracts
allows concentration determination over a range of 0.5 mg ⁄g to
2. Referenced Documents
500 mg ⁄g in cannabis. The method was validated with quality
6
control samples prepared in methanol, a candidate certified
2.1 ASTM Standards:
reference material (CRM), and repeat analysis of cannabinoid
D1193 Specification for Reagent Water
3
samples.
D8245 Guide for Disposal of Resin-Containing Cannabis
NOTE 1—For this test method, dried raw material from a cannabis plant
Raw Materials and Downstream Products
D8270 Terminology Relating to Cannabis
D8282 Practice for Laboratory Test Method Validation and
1
This test method is under the jurisdiction of ASTM Committee D37 on
Method Development
Cannabis and is the direct responsibility of Subcommittee D37.03 on Laboratory.
E203 Test Method for Water Using Volumetric Karl Fischer
Current edition approved Aug. 1, 2022. Published September 2022. DOI:
Titration
10.1520/D8375-22.
2
Health Canada, Guidance Document: Good production practices guide for
cannabis Testing for Phytocannabinoids.
3. Terminology
3
McRae, G. and Melanson, J. E., Quantitative determination and validation of 17
cannabinoids in cannabis and hemp using liquid chromatography-tandem mass
3.1 Definitions—For general terms related to cannabis, refer
spectrometry, Anal Bioanal Chem, Vol 412, No. 27, 2020, pp. 7381–7393,
to Terminology D8270.
doi:10.1007/s00216-020-02862-8.
4
Mudge, E. M., Murch, S. J., Brown, P. N., Leaner and greener analysis of
3.2 Definitions of Terms Specific to This Standard:
cannabinoids, Anal Bioanal Chem, Vol 409, No. 12, 2017, pp. 3153–3163, doi:
10.1007/s00216-017-0256-3.
5
Vaclavik, L., Benes, F., Fenclova, M., Hricko, J., Krmela, A., Svobodova, V., et
6
al. Quantitation of cannabinoids in cannabis dried plant materials, concentrates, and For referenced ASTM standards, visit the ASTM website, www.astm.org, or
oils using liquid chromatography-diode array detection technique with optional contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
mass spectrometric detection: single-laboratory validation study, first action
...

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ASTM D8270-23b(Terminology)
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1.1 This terminology is a compilation of definitions of technical terms used in the cannabis industry. Terms that are generally understood or adequately defined in other readily available sources are not included.  
1.2 When a term is used in an ASTM document for which Committee D37 is responsible it is included only when judged, after review by Subcommittee D37.91, to be a generally usable term.  
1.3 Definitions that are identical to those published by other ASTM committees or other standards organizations are identified with the committee number (for example, D20) or with the abbreviation of the name of the organization (for example, IUPAC, International Union of Pure and Applied Chemistry).  
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Standard Guide for Compliance to the Specifications of ASTM D8450

SIGNIFICANCE AND USE
4.1 Standards and practices for assuring safety, quality, and weight stabilization during key steps of the cannabis/hemp flowers sojourn are in order.  
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1.1 Specification D8450 specifies the environmental conditions, such as temperature, humidity, and lighting under which the cured, dry, cannabis/hemp flowers in fresh format intended for human use are to be packaged to assure the safety, quality, and weight stabilization of the packaged flower. This guide suggests means by which the packager of cannabis/hemp can meet Specification D8450.  
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1.2 This guide applies only to controlling an indoor environment (heat, cooling, humidity control, lighting) surrounding packaging operations. Outdoor operations are outside the scope of this guide and are not addressed.  
1.3 This guide can be used by licensed operators in the cannabis/hemp space who move the cured crop(s) into consumer or non-consumer packaging used for distribution.  
1.4 Security of the cannabis/hemp flower during the packaging process is not within the scope of this guide.  
1.5 This guide is intended to remain valid until the packaged cannabis/hemp flower is placed in storage or transit.  
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4.1 Standards and practices for assuring safety, quality, and weight stabilization during key steps of the cannabis/hemp flowers’ sojourn are in order.  
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Standard Guide for Meeting the Specifications of ASTM D8423

SIGNIFICANCE AND USE
4.1 Standards and practices for assuring safety, quality, and weight stabilization during key steps of the cannabis/hemp flowers’ sojourn are in order.  
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Standard Test Method for Determination of Cannabinoid Concentration in Dried Cannabis and Hemp Raw Materials using Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)

SIGNIFICANCE AND USE
5.1 The analysis and reporting of cannabinoid content in cannabis and hemp is required to address human health and safety concerns, satisfy testing and labeling requirements, and meet the regulatory guidelines of various jurisdictions. This test method is useful in providing quantitative results for up to seventeen cannabinoids in dried cannabis and hemp raw material samples.
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1.1 This test method allows for the concentration determination of the cannabinoids listed in Table 1, and shall apply to any dried raw material from a cannabis plant (Note 1, Note 2) regardless of the type of cannabis plant from which it was derived.2 For the sake of brevity, the term “cannabis” shall be used from now on to refer to any type of cannabis plant including those that can be classified as hemp. The procedure includes sub-sampling a ground, homogeneous sample, extraction with methanol:water (80:20, v:v),3,4 dilution in methanol and analysis by liquid chromatography tandem mass spectrometry (LC-MS/MS). The method allows for a wide-range of sample concentrations to be determined by using a 1000-fold calibration range and the option to perform multiple levels of sample dilution. The calibration curve is prepared in methanol over a range of 10 ng/mL to 10 000 ng/mL for all seventeen cannabinoids, or a subset of cannabinoids if desired, while the sample extracts are diluted in methanol into the calibration range.3,4,5 For example, a 1/500 dilution of sample extracts allows concentration determination over a range of 0.5 mg/g to 500 mg/g in cannabis. The method was validated with quality control samples prepared in methanol, a candidate certified reference material (CRM), and repeat extraction and analysis of cannabinoid samples.3  
Note 1: For this test method, dried raw material from a cannabis plant includes one or more of inflorescence, leaves, or stems.
Note 2: Certain jurisdictions or regulations may require specific parts of the plant to be included or excluded for analysis and those regulations will take precedence for the selection of plant parts.  
1.2 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 List of Measurable Analytes—See Table 1.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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SIGNIFICANCE AND USE
5.1 The analysis and reporting of pesticide content in all forms of cannabis raw material that is grown or processed or both, with the intent of ingestion or consumption, is required to address health and safety concerns, satisfy testing and labeling requirements, and meet the regulatory guidelines of various jurisdictions where cannabis has been legalized for ingestion or consumption for medicinal or recreational purposes, or both. This test method is useful in providing quantitative results for the analytes listed in Table 1, which is a subset of the pesticide testing requirements found in regulatory documents for cannabis, not limited to and including Canada, many U.S. states where legalization has occurred, and the European Pharmacopeia (1-4). This test method may be appropriate for additional pesticide and growth regulator analytes, which may be added to those of Table 1 provided validation is performed in accordance with Practice D8282. Analytes may be removed from Table 1 without additional validation.
SCOPE
1.1 This test method allows for the concentration determination of the pesticides listed in Table 1 and shall apply to any dried raw material from a cannabis plant (Note 1, Note 2) regardless of the type of cannabis plant from which it was derived (1, 2).2 For the sake of brevity, the term “cannabis” shall be used from now on to refer to any type of cannabis plant including those which can be classified as hemp. The procedure includes sub-sampling a ground, homogenous sample, liquid-solid extraction with acetonitrile:acetic acid (100:1, v:v), solid phase extraction with C18 SPE media, dilution in 3 mM ammonium formate in water with 0.1 % formic acid and 3 mM ammonium formate in methanol with 0.02 % formic acid in a 20:80 ratio (v:v) and analysis by LC-MS/MS. This procedure encompasses the entire process from sample preparation to analyte quantitation encompassing a range of 0.005 µg/g to 0.500 µg/g.  
Pyrethrins = Pyrethrin I and II
Spinetoram = Spinetoram J and L
Spinosad = Spinosyn A and D
Note 1: For this test method, dried raw material from a cannabis plant includes one or more of inflorescence, leaves, or stems.
Note 2: Certain jurisdictions or regulations may require specific parts of the plant to be included or excluded for analysis and those regulations will take precedence for the selection of plant parts.  
1.2 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 Table 1 lists the analytes measured by this test method.  
1.4 No recommendations found within this test method shall preclude observance of federal, state, or local regulations, which may be more restrictive or have different requirements.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
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ASTM D8493-23(Guide)
Standard Guide for Sample Preparation of Cannabis and Hemp Inflorescence for Laboratory Analysis

SIGNIFICANCE AND USE
5.1 The sample preparation procedure for comminution impacts other downstream processes such as extraction and sonication, which ultimately affects the total analytical error (TAE) and measurement uncertainty.  
5.2 Factors that may influence the sample preparation process include the prevention of cross-contamination (carryover) from a prior sample and an inadequate cleaning procedure between preparation of samples, poor sample handling, storage (sample preservation), and moisture content (drying methods) of plant material being greater than 15 % (15). Samples with high moisture content are hard to process completely and may yield lower analyte (that is, cannabinoid) concentration during extraction and further processing. Lastly, water activity Specification D8197 is recommended, activity (aw) range (0.55 to 0.65) for dry cannabis or hemp flower or both.  
5.3 There are many different types of hardware technologies that address the comminution of dried cannabis or hemp; however, the list of devices is exhaustive and thus beyond the scope of this guide. See Table 3 and Table 4  (16-18) for a summary of different milling technologies. Distinctions among various pieces of equipment often relate to the type, mass, and size/shape of the sample (dry, fibrous) for which each is most effective. In addition, there may be economic reasons for mill selection, that is, the sample throughput of the testing laboratory (number of samples per day), access to cryogenics, and sample mass requirements.    
5.4 In addition to sampling devices, this guide does not include the sample preparation of edibles, tinctures, oils/concentrates, beverages, and so forth in which the sample diversity poses significant sample preparation challenges to be put forward in additional work items.  
5.5 The sample size for comminution purposes is limited as the analytical testing portion required is often 500 times smaller than the bulk sample lot and not every testing laboratory is equipped to handl...
SCOPE
1.1 In this guide, the basic steps in obtaining a test portion sample of either dried cannabis/hemp inflorescence are outlined.  
1.2 Sample preparation depends on many factors including moisture (dryness) of the sample, the analyte to be measured, the concentrations/amounts, and the test method's precision and accuracy requirements. In this case, dried cannabis or hemp plant material require particle size reduction-comminution from a representative sample of which the final analytical testing portion is determined by the employed testing method. Local regulatory guidelines often dictate both the representative sample that is taken from the bulk material (harvest batch) and the final mass of the test portion (for example  
1.3 This guide will not purport to meet every local and state jurisdiction since different regulatory requirements vary; the local/state requirements are at the discretion of the user to follow and interpret.  
1.4 Units—The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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Standard Specification for Medicinal-use Cannabis Inflorescence

SCOPE
1.1 This standard defines the specifications (appropriate tests, their analytical methods and acceptance criteria) for the identification, strength (for example, cannabinoid content), and purity (for example, limits for contaminants) for medicinal-use cannabis inflorescence.  
1.2 This specification references approved analytical methods used to verify the specifications, and in the absence of approved analytical methods, a suggested method for validating such specifications.  
1.3 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM D8452-22(Guide)
Standard Guide for Requirements for Medical-related Professionals within the Cannabis and Hemp Industries

SIGNIFICANCE AND USE
5.1 As patient use of cannabis and hemp for medical purposes increases and medical professionals are increasingly called upon to provide medical advice, the following requirements and expectations within the medical profession are increasingly significant, requiring:  
5.1.1 Availability by patients to qualified medical professionals who can provide safe and objective advice on the medical use of cannabis and hemp,  
5.1.2 Clarity by medical professionals on the legal restrictions in their area of jurisdiction to ensure compliance, and  
5.1.3 Development of qualified training and certificate programs to ensure safe and quality healthcare for patients.  
5.2 The primary objectives of this guide are as follows:  
5.2.1 Provide a general overview of the BoK required for the professions listed in Section 7; and  
5.2.2 Provide recommendations to form the foundation for training and subsequent recognition/certificate systems that enable consumers, employers, organizational management, government agencies, and others who rely upon medical professionals to distinguish between qualified and non-qualified workers.  
5.2.3 Recommend requirements that agencies can use to develop and document the specific criteria used for training or certificate programs.  
5.3 Users of this guide shall document deviations from the recommended requirements to inform their clients of the criteria applied in either the training or the certificate programs offered. As the cannabis and hemp industries and medical guidelines mature, this guide will be updated to reflect current thinking and requirements.  
5.4 The Bok elements are applicable to certificate programs, while the BoK, experiential and educational elements are applicable to certification process requirements.
SCOPE
1.1 This guide can provide certification bodies, training providers, employers, and certificate issuers, with best-practice guidance for administering their respective programs for medical-related professions within the cannabis and hemp industries.  
1.2 This guide recommends requirements for experience, training, education, and the body of knowledge (BoK) necessary for medical-related professions within the cannabis and hemp industries listed in Table 1.  
1.3 For purposes of this guide, a medical professional is defined as a person qualified and licensed as required by the jurisdiction to provide guidance or recommendations regarding a person's health or fitness.  
1.4 This guide provides recommendations for articulating professional requirements for training and education or earning certificates. It is part of a series of guides denoting certification requirements for professions within the cannabis and hemp industries (Guides D8346, D8347, D8348), and supporting Practice D8403 for associated certificate programs.  
1.5 This guide's content does not supersede requirements for training or earning a certificate defined by jurisdictional entities such as government or other regional regulatory bodies.  
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM D8469-22(Test Method)
Standard Test Method for Analysis of Multiple Elements in Cannabis Matrices by Inductively Coupled Plasma Mass Spectrometry (ICP-MS)

SIGNIFICANCE AND USE
5.1 Medical and/or recreational marijuana (cannabis) has been legalized for adult use in many countries and states within the USA (5). Many jurisdictions that permit the use of medicinal and recreational marijuana require testing of cannabis and associated products to ensure safety from contaminants, especially the toxic “big four” elements such as As, Cd, Hg, and Pb (6), and other metals worthy of consideration (6). These heavy metals can accumulate in plants grown in polluted soils or contamination can occur during the manufacturing process (7). In addition to ensuring product safety, the analysis of mineral and other trace elements is required for labeling purposes when these products are sold as nutritional supplements. Trace element analysis of plant and nutritional supplement materials is a well-established application (8). Following acidic digestion to break down the plant-based samples' primary components, ICP-MS is often used for quantitative analysis because of its multi-element capability, high sensitivity, speed, robustness, and wide dynamic range.  
5.2 This test method covers the rapid determination of multiple elements in cannabis sample digests. The elements include the priority toxic elements (As, Cd, Hg, and Pb), as well as elements required by some states and elements of interest in the cannabis community (V, Cr, Cu, Zn, Sb, Ba, Se, Ag, Na, Al, K, Mn, Fe, Co, Ni, Mo, Tl, Th, and U). Irrespective of the number of elements being measured, test times are approximately a few minutes per test specimen, and detectability for most elements is in the low- to sub-ppb range.
SCOPE
1.1 This test method uses inductively coupled plasma mass spectrometry (ICP-MS) to determine multiple trace elements in cannabis and cannabis-related matrices following sample preparation using microwave-assisted acid digestion. This test method is applicable to the quantification of trace levels of elements in dried plant materials, concentrates, oils, extracts, tinctures of cannabis and cannabis-related products. Other matrices may be added provided that the lab validates the extra matrices using Practice D8282. Details are provided on the validation of both the sample preparation procedure and analytical method using certified reference materials (CRMs) and validation of the analytical method using spike recovery testing of several cannabis based samples.  
1.2 This test method should be used by analysts experienced in the use of microwave digestion and ICP-MS, matrix interferences, and procedures for their correction or reduction, and should only be used by personnel trained in the handling, preparation, and analysis of samples for the determination of trace elements in cannabis and cannabis products (1).2 This test method was developed using a single quadrupole ICP-MS equipped with a collision/reaction cell (CRC) that can be pressurized with helium (He) gas for the removal of polyatomic interferences using kinetic energy discrimination (KED). This test method can also be run using a triple quadrupole or “tandem” mass spectrometer (MS/MS) ICP-MS instrument, which is fitted with CRC technology. The ICP-MS method accounts for polyatomic interferences, which are the most common spectral overlaps in ICP-MS, isobaric interferences, and any potential doubly-charged ion interferences (M2+) that may arise from the presence of rare earth elements (REEs) in the samples, as the REE2+ ion interferences can affect the accuracy of the measurement of arsenic (As) and selenium (Se) in the samples. Table 1 lists elements for which the test method applies along with recommended analytical masses, and secondary masses for some elements. The priority toxic elements arsenic (As), cadmium (Cd), mercury (Hg), and lead (Pb), also sometimes referred to as the “big four” toxic trace elements are listed separately because of their toxicity, as discussed in 5.1.  
1.3 Certified reference materials (CRMs) should be matrix matc...

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