推荐回答（1个）
SGS有三种测试方法，请参考，对比如下：
Cr6+的检测方法－IEC 62321及其与ISO 3613、EPA3060方法的比较
IEC（International Electronic Committee，国际电工委员会）是世界上历史最悠久、最权威的国际性电工标准化机构。欧盟RoHS指令出台后，由于其指定的六种禁用物质的检测方法急需一个共同的国际标准，2005年6月，IEC下辖的第111号技术委员会第3工作小组 (TC 111 WG 3) 制定了《电子电气产品中管制物质测定程序》(Procedures for the Determination of Levels of Regulated Substances in Electrotechnical Products) 的草案，编号为IEC 62321。它明确而详细地阐述了测试金属、非金属（聚合物）等不同材质的基体中Cr6+含量所采用的不同方法。
对于聚合物等非金属材质样品，IEC将使用碱萃取法，最终可以得出以ppm为单位的具体数值结果，该结果可作为样品中Cr6+含量是否符合RoHS指令的判定依据。
对于金属材质样品则采用点测试法（8.5.1）或沸水萃取+比色法（8.5.2）。测试结果用阴性（Negative）或阳性（Positive）来表示，阴性结果表明在样品中没有检测到Cr6+，样品符合RoHS指令要求；反之，阳性结果表明在样品中检测到了Cr6+，根据IEC的判定方法，这意味着生产者在产品制造过程中使用了Cr6+，并且镀层中Cr6+的含量至少在镀层形成时期已超过了RoHS指令规定的限值1000 ppm。该判定方法建立在多家国际性实验室的合作研究结果上，IEC的内部研究文献对此判定方法也给予了有力的支持。因此这种表面上定性的判定方法是有科学的定量测试数据为基础的，是与RoHS指令限值相一致的。
在检测金属样品中的Cr6+含量时，IEC 62321 8.5.2方法与ISO 3613方法在萃取手段上是一致的，都是用沸水煮泡样品法将50cm2表面积的样品中的Cr6+萃取到50 mL溶液中。二者最主要的区别在于萃取时间的不同（前者10分钟，后者5分钟）以及结果的表达和判定。RoHS指令中对Cr6+的判定是：均质材料中的禁用物质不得超过1000 ppm。ISO3613方法得到的结果是μg/cm2，该值为准确值，但是其结果单位与RoHS指令的要求不一致。虽然可以将μg/cm2的结果转换成ppm，但不得不面临着均质材料的判断和获取的难题，即：是以样品总重量作为计算ppm浓度的分母，还是以镀层重量作为分母？若采用前者，显然与事实不符；若采用后者，又无法保证镀层重量的准确性。所以ISO 3613方法中经换算得到的以ppm为单位的结果仅为参考值，不能作为RoHS符合性的判据。另外，对于EPA3060方法，由于它是非金属样品的测试方法，对检测金属样品中的Cr6+含量显然不适用。
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