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ASTM International - ASTM D4192-08

Standard Test Method for Potassium in Water by Atomic Absorption Spectrophotometry

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Organization: ASTM International
Publication Date: 1 October 2008
Status: inactive
Page Count: 4
ICS Code (Examination of water for chemical substances): 13.060.50
significance And Use:

Potassium occurs in rocks in a form that is not easily solubilized; therefore, the potassium content of natural waters is usually low. Most natural waters contain less than 20 mg/L of potassium,... View More

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 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 and health practices and determine the applicability of regulatory limitations prior to use. For a specific precautionary statement, see Note 3.

Document History

February 1, 2015
Standard Test Method for Potassium in Water by Atomic Absorption Spectrophotometry
1.1 This test method covers the determination of low amounts of potassium in waters2 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...
ASTM D4192-08
October 1, 2008
Standard Test Method for Potassium in Water by Atomic Absorption Spectrophotometry
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...
January 10, 2003
Standard Test Method for Potassium in Water by Atomic Absorption Spectrophotometry
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...
December 10, 1997
Standard Test Method for Potassium in Water by Atomic Absorption Spectrophotometry
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...
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