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ASTM D4192-97

(Test Method)

Standard Test Method for Potassium in Water by Atomic Absorption Spectrophotometry

Standard Test Method for Potassium in Water by Atomic Absorption Spectrophotometry

SCOPE
1.1 This test method covers the determination of low amounts of potassium in waters  having low solids content. The applicable range of this test method is 0.20 to 4.0 mg/L when using the 766.5-nm resonance line. The range may be extended upward by dilution of an appropriate aliquot of sample or by using the less-sensitive 404.4-nm resonance line. Many workers have found that this test method is reliable for potassium levels to 0.02 mg/L, but use of this test method at this low level is dependent on the configuration of the aspirator and nebulizer systems available in the atomic absorption spectrophotometer as well as the skill of the analyst. The precision and bias data presented are insufficient to justify use of this test method in the 0.02-mg/L range.  
1.2 This test method has been used successfully with spiked reagent water. It is the analyst's responsibility to ensure the validity of this test method to other low dissolved solids matrices.  
1.3 This standard does not purport to address all of the safety problems, 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 a specific precautionary statement, see Note 2.

General Information

Status
Historical
Publication Date
09-Dec-1997
ICS
13.060.50 - Examination of water for chemical substances
Technical Committee
D19 - Water
Drafting Committee
D19.05 - Inorganic Constituents in Water
Current Stage
Ref Project

Relations

Replaced By
ASTM D4192-03 - Standard Test Method for Potassium in Water by Atomic Absorption Spectrophotometry
Effective Date
10-Jan-2003

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ASTM D4192-97 - Standard Test Method for Potassium in Water by Atomic Absorption SpectrophotometryASTM D4192-97 - Standard Test Method for Potassium in Water by Atomic Absorption Spectrophotometry
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ASTM D4192-97 - Standard Test Method for Potassium in Water by Atomic Absorption Spectrophotometry
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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NOTICE: This standard has either been superseded and replaced by a new version or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.
Designation: D 4192 – 97
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
Potassium in Water by Atomic Absorption
1
Spectrophotometry
This standard is issued under the fixed designation D 4192; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Terminology
1.1 This test method covers the determination of low 3.1 Definitions—For definitions of terms used in this test
2
amounts of potassium in waters having low solids content. method, refer to Terminology D 1129.
The applicable range of this test method is 0.20 to 4.0 mg/L
4. Summary of Test Method
when using the 766.5-nm resonance line. The range may be
4.1 Potassium is determined by flame atomic absorption
extended upward by dilution of an appropriate aliquot of
spectrophotometry. The potassium content is determined by
sample or by using the less-sensitive 404.4-nm resonance line.
Many workers have found that this test method is reliable for aspirating the low solids sample directly with no sample
pretreatment.
potassium levels to 0.02 mg/L, but use of this test method at
this low level is dependent on the configuration of the aspirator
5. Significance and Use
and nebulizer systems available in the atomic absorption
5.1 Potassium occurs in rocks in a form that is not easily
spectrophotometer as well as the skill of the analyst. The
solubilized; therefore, the potassium content of natural waters
precision and bias data presented are insufficient to justify use
is usually low. Most natural waters contain less than 20 mg/L
of this test method in the 0.02-mg/L range.
of potassium, but waters containing several hundred milli-
1.2 This test method has been used successfully with spiked
grams per litre are occasionally found. Potassium is essential to
reagent water. It is the analyst’s responsibility to ensure the
animal nutrition, but a concentration of 1000 to 2000 mg/L in
validity of this test method to other low dissolved solids
stock water is regarded as the extreme limit permissible.
matrices.
1.3 This standard does not purport to address all of the
6. Interferences
safety concerns, if any, associated with its use. It is the
6.1 In the analysis of low-solids water, interferences are
responsibility of the user of this standard to establish appro-
usually negligible.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. For a specific
7. Apparatus
precautionary statement, see Note 2.
7.1 Atomic Absorption Spectrophotometer for use at 766.5
2. Referenced Documents
nm.
2.1 ASTM Standards:
NOTE 1—The manufacturer’s instructions should be followed for all
3
D 1066 Practice for Sampling Steam
instrumental parameters. Wavelengths other than 766.5 nm may be used
3
D 1129 Terminology Relating to Water only if they have been determined to be equally suitable.
D 1192 Specification for Equipment for Sampling Water
7.2 Potassium Hollow-Cathode Lamps—Multielement hol-
3
and Steam in Closed Conduits
low cathode lamps are available and also have been found
3
D 1193 Specification for Reagent Water
satisfactory.
D 3370 Practices for Sampling Water from Closed Con-
7.3 Pressure-Reducing Valves—The supplies of fuel and
3
duits
oxidant shall be maintained at pressures somewhat higher than
the operating pressure of the instrument by using suitable
1 valves.
This test method is under the jurisdiction of ASTM Committee D-19 on Water
and is the direct responsibility of Subcommittee D19.05 on Inorganic Constituents
8. Reagents and Materials
in Water.
Current edition approved Dec. 10, 1997. Published December 1998. Originally
8.1 Purity of Reagents—Reagent grade chemicals shall be
published as D 4192–82. Last previous edition D 4192–93.
2
used in all tests. Unless otherwise indicated, it is intended that
Platte, J. A., and Marcy, V. M., “A New Tool for the Water Chemist,” Industrial
Water Engineering, May 1965.
3
Annual Book of ASTM Standards, Vol 11.01.
1

---------------------- Page: 1 ----------------------
NOTICE:¬This¬standard¬has¬either¬been¬superseded¬and¬replaced¬by¬a¬new¬version¬or
discontinued.¬Contact¬ASTM¬International¬(www.astm.org)¬for¬the¬latest¬information.¬
D 4192
all reagents shall conform to the specifications of the Commit- concentration. Aspirate water between samples.
tee on Analytical Reagents of the American Chemical Society
12. Calculation
4
where such specifications are available. Other grades may be
12.1 Calculate the concentrations of potassium in the
used, pro
...

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Standard Practice for Estimation of Chlorine Demand of Water

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5.1 Chlorine is added to potable water, waste water, and industrial water for a variety of purposes. Some of these purposes are:  
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5.1 This test method has been developed by U.S. EPA Region 5 Chicago Regional Laboratory (CRL).  
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Standard Test Method for Determination of Select Pesticides in Water by Multiple Reaction Monitoring Liquid Chromatography Tandem Mass Spectrometry

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SCOPE
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1.4 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 The Reporting Range for the target analytes are listed in Table 1.  
1.5.1 The reporting limit in this test method is the minimum value below which data are documented as non-detects. The reporting limit is calculated from the concentration of the Level 1 calibration standard as shown in Table 6 after taking into account an 8 mL water sample volume and a final diluted sample volume of 10 mL (80 % water/20 % methanol).  
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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