ASTM D6656-16 PDF

Scope: 5.1 The procedure described is specific for chromium in Wet Blue. Vanadium is the only common interfering element and is rarely present in quantity. The precision and accuracy of the methods are usually, at least, as good as the sampling of Wet Blue itself.

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 determination of chromic oxide in Wet Blue that has been partly or completely tanned with chromium compounds. In general, the samples will contain chromium content between 18201;% and 58201;% when calculated as chromic oxide expressed upon a dry basis otherwise referred to as moisture-free basis (mfb).

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 test method does not apply to Wet White.

1.4 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. See Section 9 for specific safety hazards.

ASTM D6656-16 Referenced Document

ASTM D6658 Standard Test Method for Volatile Matter (Moisture) of Wet Blue by Oven Drying
ASTM D6659 Standard Practice for Sampling and Preparation of Wet Blue and Wet White for Physical and Chemical Tests
ASTM E177 Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
ASTM E180 Standard Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals
ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

2021 ASTM D6656-16(2021) Standard Test Method for Determination of Chromic Oxide in Wet Blue (Perchloric Acid Oxidation)
2016 ASTM D6656-16 Standard Test Method for Determination of Chromic Oxide in Wet Blue (Perchloric Acid Oxidation)
2014 ASTM D6656-14b Standard Test Method for Determination of Chromic Oxide in Wet Blue (Perchloric Acid Oxidation)
2014 ASTM D6656-14a Standard Test Method for Determination of Chromic Oxide in Wet Blue 40;Perchloric Acid Oxidation41;
2014 ASTM D6656-14 Standard Test Method for Determination of Chromic Oxide in Wet Blue 40;Perchloric Acid Oxidation41;
2001 ASTM D6656-01(2010)e1 Standard Test Method for Determination of Chromic Oxide in Wet Blue (Perchloric Acid Oxidation)
2001 ASTM D6656-01(2006) Standard Test Method for Determination of Chromic Oxide in Wet Blue (Perchloric Acid Oxidation)
2001 ASTM D6656-01 Standard Test Method for Determination of Chromic Oxide in Wet Blue (Perchloric Acid Oxidation)