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ASTM D7168-05e1

(Test Method)

Standard Test Method for99Tc in Water by Solid Phase Extraction Disk

Standard Test Method for<sup>99</sup>Tc in Water by Solid Phase Extraction Disk

SIGNIFICANCE AND USE
This method has not been evaluated for all possible matrices. Method suitability should be determined on specific waters of interest.
SCOPE
1.1 This test method describes a solid phase extraction (SPE) procedure to separate 99Tc from environmental water samples (that is, non-process and effluent waters). Technetium-99 beta activity is measured by liquid scintillation spectrometry.
1.2 This test method is designed to measure 99Tc in the range of approximately 0.037 Bq/L (1.0 pCi/L) or greater for a one litre sample.
1.3 The values stated in SI units are to be regarded as standard. Values given in parentheses are provided for information purposes only.
1.4 This method has been used successfully with tap water. It is the user's responsibility to ensure the validity of this test method for samples larger than 1 L and for waters of untested matrices.
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 and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 9.

General Information

Status
Historical
Publication Date
31-May-2005
ICS
13.060.60 - Examination of physical properties of water
Technical Committee
D19 - Water
Drafting Committee
D19.04 - Methods of Radiochemical Analysis
Current Stage
Ref Project

Relations

Replaces
ASTM D7168-05 - Standard Test Method for<sup>99</sup>Tc in Water by Solid Phase Extraction Disk
Effective Date
01-Jun-2005
Replaced By
ASTM D7168-11 - Standard Test Method for <sup>99</sup>Tc in Water by Solid Phase Extraction Disk
Effective Date
15-May-2011
Referred By
ASTM D8026-16 - Standard Practice for Determination of Tc-99 in Water by Inductively Coupled Plasma Mass Spectrometry (ICP-MS)
Effective Date
01-Jun-2005
Referred By
ASTM C1387-23 - Standard Guide for the Determination of Technetium-99 in Soil
Effective Date
01-Jun-2005

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ASTM D7168-05e1 - Standard Test Method for<sup>99</sup>Tc in Water by Solid Phase Extraction DiskASTM D7168-05e1 - Standard Test Method for<sup>99</sup>Tc in Water by Solid Phase Extraction Disk
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ASTM D7168-05e1 - Standard Test Method for<sup>99</sup>Tc in Water by Solid Phase Extraction Disk
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Standards Content (Sample)

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
´1
Designation:D7168–05
Standard Test Method for
99
1
Tc in Water by Solid Phase Extraction Disk
This standard is issued under the fixed designation D7168; 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.
1
´ NOTE—Footnote 7 was updated editorially in February 2009.
1. Scope D5847 Practice for Writing Quality Control Specifications
for Standard Test Methods for Water Analysis
1.1 This test method describes a solid phase extraction
99
D6001 Guide for Direct-Push Ground Water Sampling for
(SPE) procedure to separate Tc from environmental water
Environmental Site Characterization
samples (that is, non-process and effluent waters).
Technetium-99 beta activity is measured by liquid scintillation
3. Terminology
spectrometry.
99 3.1 Definitions—For definitions of terms used in this test
1.2 This test method is designed to measure Tc in the
method refer to Terminology D1129.
range of approximately 0.037 Bq/L(1.0 pCi/L) or greater for a
one litre sample.
4. Summary of Test Method
1.3 The values stated in SI units are to be regarded as
4.1 Ameasuredaliquantofsampleistransferredtoabeaker.
standard. Values given in parentheses are provided for infor-
Hydrogen peroxide is added to facilitate the formation of the
mation purposes only.
extractable pertechnetate ion. The sample may be heated to
1.4 This method has been used successfully with tap water.
oxidize organics if such are suspected to be present. The entire
It is the user’s responsibility to ensure the validity of this test
sample is passed through a technetium-selective SPE disk onto
method for samples larger than 1 L and for waters of untested
which the pertechnetate is adsorbed. The disk is transferred to
matrices.
a liquid scintillation vial, cocktail added, and the contents well
1.5 This standard does not purport to address all of the
mixed. The beta emission rate of the sample is determined by
safety concerns, if any, associated with its use. It is the
liquid scintillation spectrometry. Chemical yield corrections
responsibility of the user of this standard to establish appro-
are determined by the method of standard additions.
priate safety and health practices and determine the applica-
4.2 Minor differences in processing between Extraction
bility of regulatory limitations prior to use. For specific hazard
Chromatographic Resin Discs and PTFE Membrane Disks are
statements, see Section 9.
addressed in Variations A and B of the method.
2. Referenced Documents
5. Significance and Use
2
2.1 ASTM Standards:
5.1 This method has not been evaluated for all possible
D1129 Terminology Relating to Water
matrices. Method suitability should be determined on specific
D1193 Specification for Reagent Water
waters of interest.
D2777 Practice for Determination of Precision and Bias of
Applicable Test Methods of Committee D19 on Water
6. Interferences
D3370 Practices for Sampling Water from Closed Conduits
6.1 Suspended materials must be removed by filtration or
D4448 Guide for Sampling Ground-Water Monitoring
centrifuging prior to processing the sample. Suspended par-
Wells
ticulate matter in the sample will be physically trapped in part
or in whole on or in the SPE extraction material.This may lead
1
This test method is under the jurisdiction of ASTM Committee D19 on Water
topotentialinclusionofradionuclidebearingsolidsortosignal
andisthedirectresponsibilityofSubcommitteeD19.04onMethodsofRadiochemi-
quenching in the liquid scintillation measurement.
cal Analysis.
6.2 Technetium-99 activity in the sample may overwhelm
Current edition approved June 1, 2005. Published June 2005. DOI: 10.1520/
99
D7168-05E01.
the signal from the Tc spike addition and interfere with
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
accurate determination of chemical yield. Samples for which
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
the unspiked sample count rate exceeds 50 % of the spiked
Standards volume information, refer to the standard’s Document Summary page on
sample count rate should be reprepared with an appropriately
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
´1
D7168–05
adjusted aliquant and spike addition levels to minimize contri- 8.3 Radioactive Purity—Radioactive purity shall be such
butions to uncertainty in the determination of the chemical that the measured radioactivity of blank samples does not
yield. exceed the calculated probable error of the measurement.
6.3 Organic co
...

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ment  
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This test method covers the apparatus and procedure for the electrometric measurement of oxidation-reduction potential (ORP) in water. The test method described has been designed for the routine and process measurement of oxidation-reduction potential. ORP is defined as the electromotive force between a noble metal electrode and a reference electrode when immersed in a solution. The ORP electrodes are inert and measure the ratio of the activities of the oxidized to the reduced species present. In addition, the ORP electrodes reliably measure ORP in nearly all aqueous solutions and in general are not subject to solution interference from color, turbidity, colloidal matter, and suspended matter. The apparatus to be used in the measurement of ORP includes: pH meter, reference electrode, oxidation-reduction electrode and electrode assembly. Materials necessary in the procedure for ORP measurement include chemical reagents, aqua regia, water, buffer standard salts, phthalate reference buffer solution, phosphate reference buffer solution, chromic acid cleaning solution, detergent, nitric acid, redox standard solution or ferrous-ferric reference solution, and redox reference quinhydrone solutions.
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Sections  
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8  
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9  
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10  
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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. For a specific hazard statement, see Section 9.  
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Standard Test Method for 99Tc in Water by Solid Phase Extraction Disk

SIGNIFICANCE AND USE
5.1 This test method has not been evaluated for all possible matrices. Test method suitability should be determined on specific waters of interest.
SCOPE
1.1 This test method describes a solid phase extraction (SPE) procedure to separate 99Tc from environmental water (non-process-related or effluent water samples). Technetium-99 beta activity is measured by liquid scintillation spectrometry.  
1.2 This test method is designed to measure 99Tc in the range of approximately 0.037 Bq/L (1.0 pCi/L) or greater for a one litre sample.  
1.3 This test method has been used successfully with tap water. It is the user’s responsibility to ensure the validity of this test method for samples larger than 1 L and for waters of untested matrices.  
1.4 Technetium-99 alternatively can be determined in water samples using Practice D8026.  
1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses are provided for information only and are not considered standard.  
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SCOPE
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SCOPE
1.1 This test method covers the determination of radioactive 90Sr in environmental water samples (for example, non-process and effluent waters) in the range of 0.037 Bq/L (1.0 pCi/L) or greater.  
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1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
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