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Significance and Use
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 .
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.
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 on Hazards and in .
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D1517 Terminology Relating to Leather
D6656 Test Method for Determination of Chromic Oxide in Wet Blue (Perchloric Acid Oxidation)
D6658 Test Method for Volatile Matter (Moisture) of Wet Blue by Oven Drying
D6659 Practice for Sampling and Preparation of Wet Blue and Wet White for Physical and Chemical Tests
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ICS Number Code 59.140.30 (Leather and furs)
UNSPSC Code 41115407(Atomic absorption AA spectrometers)
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ASTM D7967-16, Standard Test Method for Analysis of Chrome Content (as Cr