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BS EN 62321-7-2:2017:2020 Edition

BS EN 62321-7-2:2017:2020 Edition

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Determination of certain substances in electrotechnical products – Hexavalent chromium. Determination of hexavalent chromium (Cr(VI)) in polymers and electronics by the colorimetric method

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BSI 2020 24
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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-violetcoloured complex in the reaction. The complex solution is measured quantitatively by a colorimeter or a spectrophotometer at 540 nm.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 English
CONTENTS
8 FOREWORD
10 INTRODUCTION
11 1 Scope
2 Normative references
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
12 3.2 Abbreviated terms
4 Reagents
4.1 General
4.2 Reagents
13 5 Apparatus
5.1 General
5.2 Apparatus
14 6 Sampling
7 Test procedure
7.1 Extraction of Cr(VI) in soluble polymers – ABS, PC and PVC matrixes
15 7.2 Extraction of Cr(VI) in insoluble/unknown polymers and electronics – without Sb
16 8 Calibration
8.1 Permanent calibration instruments
8.2 Traditional calibration instruments
8.2.1 General
17 9 Calculation
18 10 Precision
Table 1 – Statistical data of all IIS trails
19 11 Quality assurance and control
11.1 General method
11.2 Matrix spike recovery correction method
12 Limits of detection (LOD) and limits of quantification (LOQ)
12.1 General
20 12.2 Determination of LOD and LOQ
21 13 Test report
Table 2 – Method detection limit = t x sn–1
22 Bibliography

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BS EN 62321-7-2:2017
$142.49