1.1 本试验方法包括在1至100μg范围内测定铁。 1.2 本试验方法适用于铁测定的最后步骤，不包括样品制备程序。 1.3 本试验方法适用于溶液pH值小于2的样品。假设在样品制备过程中将pH值调整到该范围内。 1.4 查看当前的安全数据表（SDS），了解有关毒性、急救程序、处理和安全预防措施的详细信息。 1.5 以国际单位制给出的数值是标准值。括号中的值仅供参考。 1.6 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和健康实践，并确定监管限制的适用性。 ====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可溶于水或其他合适的溶剂（见 10.1 和 附注5 ). 4.2 本试验方法假设显色量与试验溶液中的铁量成比例。校准曲线在指定范围内呈线性。第节描述了可能的干扰 5 .

1.1 This test method covers the determination of iron in the range from 1 to 100 μg. 1.2 This test method is intended to be general for the final steps in the determination of iron and does not include procedures for sample preparation. 1.3 This test method is applicable to samples whose solutions have a pH less than 2. It is assumed that the pH is adjusted to within this range in the sample preparation. 1.4 Review the current Safety Data Sheets (SDS) for detailed information concerning toxicity, first-aid procedures, handling, and safety precautions. 1.5 The values given in SI units are the standard. Values in parentheses are for information only. 1.6 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. ====== 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 5 ). 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 .