GB/T 29783-2013Determination of chromium(VI) in electrical and electronic products - Atomic fluorescence spectrometry (English PDF)

1 Scope

This standard specifies the analytical method for the determination of chromium (VI) in electrical and electronic products by atomic fluorescence spectrometry.

This standard applies to the determination of chromium (VI) in polymer materials in electrical and electronic products.

2 Normative references

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this standard.

GB/T 6682 Water for analytical laboratory use -- Specification and test methods

GB/T 26125 Electrical and electronic products -- Determination of six regulated substances (lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl ethers) (GB/T 26125-2011, IEC 62321:2008, IDT)

3 Principles

After the hexavalent chromium in the sample is extracted with toluene-lye extraction solution, adjust the pH value to 2~4 with nitric acid, and make it pass through a cation exchange column; then, trivalent chromium is retained on the column, and hexavalent chromium directly flows out. After dilution, the content of chromium in the solution was determined by atomic fluorescence spectrometry to calculate the content of hexavalent chromium in the sample. add water to dilute to 1000 mL.

5 Reagents or materials

5.8 0.01 mol/L HNO3 solution: measure out 0.9 mL of concentrated nitric acid (5.1), then add water to dilute to 1000 mL.

5.9 Toluene.

6 Sample preparation

The samples shall be manually sheared, roughly ground, and finely ground according to GB/T 26125, crushed to less than 1 mm, for later use.

7 Analysis steps