1.1 本指南仅涵盖六价铬化合物的安全生产、储存、运输和处理的控制程序 表1 以及它们的各种水合物和它们的共沉淀物的混合物。 1.2 本指南无意涵盖( 一 )诸如钠、钾、镁或铵的铬酸盐等“可溶性”铬酸盐；( b )可溶性重铬酸盐；( c )铬酸；( d )挥发性铬基化合物；( e )任何三价铬化合物；或( f )元素铬。省略所述化合物或化合物类别不应被解释为意味着可以在没有适当考虑其特定物理、化学和毒理学危害的情况下处理这些化合物 ( 9 , 10 , 11 ) . 1.3 铬酸盐离子CrO 4. −2. 取决于酸度，复合物形成二、三和更高级的多色；因此 表1 根据分离方法和最终用途的不同，可能含有多种色素的混合物。 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 （有关更具体的预防信息，请参阅第节 5. .) 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 4.1 本指南包括不易溶于水且水溶性（铬酸盐离子）在更易溶于铬酸钙和更难溶于铬酸铅范围内的铬酸盐。可能接触不溶性铬酸盐的主要职业是铬铁矿的焙烧、铬酸盐颜料的制造、含有铬酸盐颜料的涂料的制造以及这些涂料的喷漆。 没有足够的证据证明三价铬化合物是致癌的。

1.1 This guide covers control procedures for the safe production, storage, transportation, and handling of only the hexavalent chromium compounds found in Table 1 and their various hydrates, and mixtures of coprecipitates of the same regardless of crystalline form. 1.2 This guide is not intended to cover ( a ) such “soluble” chromates as chromates of sodium, potassium, magnesium, or ammonium; ( b ) soluble bichromates; ( c ) chromic acid; ( d ) volatile chromyl compounds; ( e ) any trivalent chromium compound; or ( f ) elemental chromium. Omission of said compounds or classes of compounds should not be construed to mean that they may be handled without due regard to their particular physical, chemical, and toxicological hazards ( 9 , 10 , 11 ) . 1.3 The chromate ion, CrO 4 −2 , depending upon the acidity, complexes to form di-, tri-, and higher polychromates; hence, the chromates listed in Table 1 may contain mixtures of polychromates, depending on the method of isolation and end use. 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. (For more specific precautionary information see Section 5 .) 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 ====== 4.1 This guide includes chromates that are not readily soluble in water and that have water solubilities (Chromate ION) within the range of the more soluble calcium chromate and the much less soluble lead chromate. The major occupations involving potential exposure to insoluble chromates are in roasting of chromite ore, the manufacture of chromate pigments, the manufacture of coatings containing chromate pigments, and spray painting with these coatings. There is insufficient evidence to conclude that trivalent chromium compounds are carcinogenic.