Division 1.3 REFERENCE SUBSTANCE
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65% (w/w) aqueous nitric acid (analytical grade) is required as a reference substance.f1
Optionally, if the experimenter foresees that the results of this test may eventually be used for other purposes, testing of additional reference substances may also be appropriate.f2
Annotations
Footnotes
- f1
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The acid should be titrated before testing to confirm its concentration.
- f2
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E.g.: 50% (w/w) perchloric acid and 40% (w/w) sodium chlorate are used in reference 1.