BS EN 62321-7-2:2017描述了测量六价铬、六价铬和六价铬的程序， 在聚合物和电子产品的样品中进行定量分析。这种方法使用有机溶剂来溶解 溶解或膨胀样品基质，然后进行碱性消化程序以提取 样品中的Cr（VI）。研究表明，有机/碱性溶液比有机/碱性溶液更有效 从可溶性和不溶性样品中提取六价铬的酸性溶液。最小减少 在碱性条件下，Cr（VI）氧化为Cr（III）或Cr（III）氧化为Cr（VI）。适用于由ABS（丙烯腈-丁二烯-苯乙烯）、PC（聚碳酸酯）组成的可溶性聚合物 和PVC（聚氯乙烯），样品首先溶解在适当的有机溶剂中 然后用碱性萃取溶液萃取Cr（VI）。对于不溶性/未知聚合物，或不含锑（Sb）的电子材料， 样品在150°C的甲苯/碱性溶液中消化？C到160？C.然后是有机食品 分离并丢弃提取物中的相；无机相被保留用于Cr（VI） 分析提取物中的Cr（VI）浓度由其在酸性条件下的反应确定 1,5-二苯基碳酰肼。在与二苯基碳酰二肼的反应中，六价铬被还原为三价铬 它被氧化成二苯碳腙。铬（III）和二苯卡巴腙形成红色紫罗兰色 复杂的反应。复杂溶液的定量测量是通过一个 在540 nm处使用色度计或分光光度计。交叉引用:IEC 62321-1:2013ISO 3696:1987EN ISO 3696EN 62321-1（IEC 62321-1:2013）ASEN 62321-2EN 62321:2009EN ISO 648ISO 648:2008IEC 62321-5:2013IEC 62321:2008ASTM E1272-02（2012）取代了目前仍然有效的BS EN 62321:2009。购买本文件时可获得的所有当前修订均包含在购买本文件中。

BS EN 62321-7-2:2017 describes procedures to measure hexavalent chromium, Cr(VI), quantitatively in samples of polymers and electronics. This method employs organic solvent to dissolve or swell the sample matrix, followed by an alkaline digestion procedure to extract Cr(VI) from samples. Studies have shown that organic/alkaline solution is more effective than acidic solution in extracting Cr(VI) from soluble and insoluble samples. Minimal reduction of Cr(VI) to Cr(III) or oxidation of Cr(III) to Cr(VI) occurs under alkaline conditions.For soluble polymers consisting of ABS (Acrylonitrile- butadiene-styrene), PC (Polycarbonate) and PVC (poly(vinyl chloride)), the samples are first dissolved in an appropriate organic solvent and Cr(VI) is then extracted by an alkaline extraction solution.For insoluble/unknown polymers, or electronic materials that do not contain antimony (Sb), the samples are digested in a toluene/alkaline solution at 150?C to 160?C. Then the organic phase in the extracts are separated and discarded; the inorganic phase is retained for Cr(VI) analysis.The Cr(VI) concentration in the extract is determined by its reaction under acidic conditions with 1,5-diphenylcarbazide. Cr(VI) is reduced to Cr(III) in the reaction with diphenylcarbazide which is oxidized to diphenylcarbazone. The Cr(III) and diphenylcarbazone form a red-violetcoloured complex in the reaction. The complex solution is measured quantitatively by a colorimeter or a spectrophotometer at 540 nm.Cross References:IEC 62321-1:2013ISO 3696:1987EN ISO 3696EN 62321-1 (IEC 62321-1:2013) ASEN 62321-2EN 62321:2009EN ISO 648ISO 648:2008IEC 62321-5:2013IEC 62321:2008ASTM E1272 - 02(2012)Replaces BS EN 62321:2009 which remains current.All current amendments available at time of purchase are included with the purchase of this document.