1.1 本试验方法包括测定各种产品中1至100μg/g范围内的微量铁浓度。 1.2 使用该方法确定试验结果是否符合适用规范；结果应按照实践的四舍五入方法进行四舍五位 第29页 . 1.3 以国际单位表示的数值视为标准值。本标准不包括其他计量单位。 1.4 对于本规范中使用的所有材料，请参考当前的OSHA法规、供应商的安全数据表和当地法规。 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====== 4.1 本试验方法适用于测定各种产品中的微量铁浓度，前提是适当的样品制备使铁和样品基质溶于水或其他合适的溶剂（参见 10.1 和 附注4 ). 4.2 本试验方法假定显色量与试验溶液中的铁量成正比。校准曲线在规定范围内呈线性。第节描述了可能的干扰 5. .

1.1 This test method covers the determination of trace concentrations of iron in the range from 1 to 100 μg/g in a wide variety of products. 1.2 In determining the conformance of the test results using this method to applicable specifications; results shall be rounded off in accordance with the rounding-off method of Practice E29 . 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 Consult current OSHA regulations, suppliers’ Safety Data Sheets, and local regulations for all materials used in this specification. 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 test method is suitable for determining trace concentrations of iron in a wide variety of products, provided that appropriate sample preparation has rendered the iron and sample matrix soluble in water or other suitable solvent (see 10.1 and Note 4 ). 4.2 This test method assumes that the amount of color developed is proportional to the amount of iron in the test solution. The calibration curve is linear over the specified range. Possible interferences are described in Section 5 .