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1.1 This test method covers the Atomic Absorption procedure, using nitrous oxide-acetylene flame, to analyze the chrome content of Wet Blue on a moisture-free basis.

1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

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. Some specific hazards statements are given in Section 9 on Hazards and in 12.5.

5.1 The procedure described is for chromium in Wet Blue using Atomic Absorption. This method may be used to determine the chromium content in Wet Blue as an alternate to Test Method D6656.

5.2 The chromium content of Wet Blue is related to the degree of tannage obtained, and hence may be a matter for specification in the purchase of Wet Blue. The procedure described provides adequate accuracy for this purpose.