Standard Test Method for
Sodium in Water by Atomic Absorption Spectrophotometry1

This standard is issued under the fixed designation D 4191; 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*

1.1 This test method covers the determination of low
amounts of sodium in waters2 having low solids content. The
applicable range of this test method is from 0.20 to 3.0 mg/L
when using the 589.6-nm resonance line. This range may be
extended upward by dilution of an appropriate aliquot of
the sample or by use of the less-sensitive 330.2-nm resonance line
(see Test Method D 3561). Many workers have found that this
the test method is reliable for sodium levels to 0.005 mg/L, but use
of this test method at this low level is dependent on the
configuration of the aspirator and nebulizer system available in
the atomic absorption spectrophotometer as well as the experience and skill of the analyst. The precision and bias data
presented are insufficient to justify use of this test method in
the 0.005 to 0.20-mg/L range.

1.2 This test method has been used successfully with spiked
reagent water. It is the analyst’s responsibility to assure the
validity of the 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.

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
D 2777 Practice for Determination of Precision and Bias of
Applicable Methods of Committee D-19 on Water3
D 3370 Practice for Sampling Water from Closed Conduits3
D 3561 Test Method for Lithium, Potassium, and Sodium

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