1.1 本试验方法包括测定部分或完全用铬化合物鞣制的蓝湿革中的氧化铬。通常，样品中的铬含量在1 % 和5 % 当计算为以干基表示的氧化铬时，也称为无湿基（mfb）。 1.2 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.3 本试验方法不适用于湿白色。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 参见第节 9 针对特定的安全隐患。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 所述程序针对蓝湿革中的铬。钒是唯一常见的干扰元素，数量很少。这些方法的精密度和准确度通常至少与蓝湿病本身的采样一样好。 5.2 蓝湿革的铬含量与获得的鞣制程度有关，因此可能是购买蓝湿革时的规格问题。所述程序为此目的提供了足够的准确性。

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 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. See Section 9 for specific safety hazards. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== 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.