Standard Test Method for
Potassium in Water by Atomic Absorption
Spectrophotometry1

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 the last revision. A number in parentheses indicates the year of the last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

1. Scope*

1.1 This test method covers the determination of low
amounts of potassium in waters 2 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 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.

2. Referenced Documents

2.1 ASTM Standards:
D 1066 Practice for Sampling Steam3
D 1129 Terminology Relating to Water3
D 1192 Specification for Equipment for Sampling Water
and Steam in Closed Conduits3
D 1193 Specification for Reagent Water3

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