IEC 62321-7-1:2015 电工产品中某些物质的测定 - 第7-1部分:六价铬 - 通过比色法在无色和有色腐蚀保护涂层中存在六价铬（Cr（VI））

标准编号：IEC 62321-7-1:2015

中文名称：电工产品中某些物质的测定 - 第7-1部分:六价铬 - 通过比色法在无色和有色腐蚀保护涂层中存在六价铬（Cr（VI））

英文名称：Determination of certain substances in electrotechnical products - Part 7-1: Hexavalent chromium - Presence of hexavalent chromium (Cr(VI)) in colourless and coloured corrosion-protected coatings on metals by the colorimetric method

发布日期：2015-09-16

标准范围

IEC 62321-7-1:2015描述了一种沸水萃取程序，旨在定性测定金属样品上无色和有色防腐涂层中六价铬（Cr（VI））的存在。在该程序中，当检测到样品中的Cr（VI）低于0.10 g/cm2的定量限时，该样品被视为Cr（VI）阴性。由于即使在同一批样品中，Cr（VI）也可能不会均匀分布在涂层中，因此0.10 g/cm2和0.13 g/cm2之间的“灰色区”被确定为“非决定性”，以减少不可避免的涂层变化导致的不一致结果。在这种情况下，可能需要额外的测试来确认Cr（VI）的存在。当检测到Cr（VI）高于0.13 g/cm2时，样品被认为是涂层中Cr（VI）的阳性。

IEC 62321-7-1:2015 describes a boiling water extraction procedure intended to provide a qualitative determination of the presence of hexavalent chromium (Cr(VI)) in colourless and coloured corrosion-protection coatings on metallic samples. In this procedure, when Cr(VI) in a sample is detected below the 0,10 g/cm2 LOQ (limit of quantification), the sample is considered to be negative for Cr(VI). Since Cr(VI) may not be uniformly distributed in the coating even within the same sample batch, a "grey zone" between 0,10 g/cm2 and 0,13 g/cm2 has been established as "inconclusive" to reduce inconsistent results due to unavoidable coating variations. In this case, additional testing may be necessary to confirm the presence of Cr(VI). When Cr(VI) is detected above 0,13 g/cm2, the sample is considered to be positive for the presence of Cr(VI) in the coating layer.

标准预览图