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Standard Test Method for Determination of Chromic Oxide in Wet Blue (Perchloric Acid Oxidation) (Includes all amendments And changes 12/5/2014).
Automaticky přeložený název:
Standardní zkušební metoda pro stanovení chromové oxidu v wet blue ( kyselina chloristá oxidace )
NORMA vydána dne 1.5.2014
Označení normy: ASTM D6656-14a
Poznámka: NEPLATNÁ
Datum vydání normy: 1.5.2014
Kód zboží: NS-36038
Počet stran: 4
Přibližná hmotnost: 12 g (0.03 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
blue stock, chrome content, chromic oxide, perchloric acid oxidation, wet blue, ICS Number Code 59.140.10 (Processes and auxiliary materials), 71.040.40 (Chemical analysis)
Significance and Use | ||||||||||
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. |
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1. Scope | ||||||||||
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.
Standard Practice for Sampling and
Preparation of Wet Blue and Wet White for Physical and Chemical
Tests Standard Practice for Conducting an
Interlaboratory Study to Determine the Precision of a Test
Method Standard Test Method for Volatile Matter
(Moisture) of Wet Blue by Oven Drying Standard Practice for Use of the Terms
Precision and Bias in ASTM Test Methods Standard Practice for Determining the
Precision of ASTM Methods for Analysis and Testing of Industrial
and Specialty Chemicals (Withdrawn 2009) |
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