IEC 62321-7-2:2017
電工技術產品中某些物質的測定. 第7-2部分: 六價鉻. 采用比色法測定電子聚合物中的六價鉻(Cr(VI))
Determination of certain substances in electrotechnical products - Part 7-2: Hexavalent chromium - Determination of hexavalent chromium (Cr(VI)) in polymers and electronics by the colorimetric method
IEC 62321-7-2:2017 發布歷史
IEC 62321-7-2:2017由國際電工委員會 IX-IEC 發布于 2017-03，并于 2017-03-31 實施。
IEC 62321-7-2:2017 在中國標準分類中歸屬于: K04 基礎標準和通用方法，在國際標準分類中歸屬于: 31.020 電子元器件綜合,71.040.50 物理化學分析方法。
本標準有等同采用的 中文版 GB/T 39560.702-2021 電子電氣產品中某些物質的測定 第7-2部分：六價鉻 比色法測定聚合物和電子件中的六價鉻[Cr（VI）]
IEC 62321-7-2:2017 發布之時，引用了標準
- IEC 62321-1:2013 電工制品中特定物質的測定.第1部分:簡介和概述
- ISO 3696:1987 分析實驗室用水 規范和試驗方法
IEC 62321-7-2:2017的歷代版本如下：
- 2017年 IEC 62321-7-2:2017 電工技術產品中某些物質的測定. 第7-2部分: 六價鉻. 采用比色法測定電子聚合物中的六價鉻(Cr(VI))
This part of IEC 62321 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-violet- coloured complex in the reaction. The complex solution is measured quantitatively by a colorimeter or a spectrophotometer at 540 nm.
- 標準號
- IEC 62321-7-2:2017
- 發布
- 2017年
- 中文版
- GB/T 39560.702-2021 (等同采用的中文版本)
- 發布單位
- 國際電工委員會
- 當前最新
- IEC 62321-7-2:2017
- 引用標準
- IEC 62321-1:2013 ISO 3696:1987
- 被代替標準
- IEC 111/408/CDV:2016 IEC 62321:2008(部分代替)