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ASTM D6656-14b
Standard Test Method for Determination of Chromic Oxide in Wet Blue (Perchloric Acid Oxidation)
4 стр.
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Разработчик:
Зарубежные/ASTM
ICS:
59.140.10 Processes and auxiliary materials / Процессы и вспомогательные материалы71.040.40 Chemical. Including analysis of gases and surface chemical analysis / Химический анализ. Включая анализ газов
Сборник (ASTM):
15.04 Soaps and Other Detergents; Polishes; Leather; Resilient Floor Coverings / Мыло и другие моющие средства; Полировальные материалы; Кожа; Эластичные покрытия для полов
Тематика:
Leather
Описание
Значение и использование

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.

Область применения

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.

Ключевые слова:
blue stock; chrome content; chromic oxide; perchloric acid oxidation; wet blue;