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ASTM D6656-14

Historical Revision

Standard Test Method for Determination of Chromic Oxide in Wet Blue (Perchloric Acid Oxidation)

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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 1 % and 5 % 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 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.


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.

SDO ASTM: ASTM International
Document Number D6656
Publication Date April 1, 2014
Language en - English
Page Count 4
Revision Level 14
Supercedes
Committee D31.02
Publish Date Document Id Type View
Dec. 1, 2024 D6656-24 Revision
Sept. 1, 2016 D6656-16 Revision
Nov. 1, 2014 D6656-14B Revision
May 1, 2014 D6656-14A Revision
April 1, 2014 D6656-14 Revision
May 10, 2001 D6656-01 Revision
Sept. 1, 2021 D6656-16R21 Reaffirmation
Oct. 1, 2010 D6656-01R10E01 Reaffirmation
Oct. 1, 2006 D6656-01R06 Reaffirmation