GB/T 29783-2013 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 29783-2013 | English | 130 |
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Determination of chromium (VI) in electrical and electronic products -- Atomic fluorescence spectrometry
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GB/T 29783-2013: Determination of chromium (VI) in electrical and electronic products -- Atomic fluorescence spectrometry
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT29783-2013
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 31.020
L 10
Determination of chromium (VI) in electrical and electronic
products -- Atomic fluorescence spectrometry
ISSUED ON: OCTOBER 10, 2013
IMPLEMENTED ON: FEBRUARY 1, 2014
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Principles ... 4
4 Instruments and equipment ... 5
5 Reagents or materials ... 5
6 Sample preparation ... 6
7 Analysis steps ... 6
8 Quality Control ... 7
Appendix A (Informative) Reference Operating Conditions for Microwave Extraction,
Atomic Fluorescence Spectrometry and Electrothermal Evaporation ... 9
Determination of chromium (VI) in electrical and electronic
products -- Atomic fluorescence spectrometry
Warning -- The personnel using this document shall have practical experience in
formal laboratory work. This document does not indicate all possible safety issues.
The user is responsible for taking appropriate safety and health measures and
ensuring compliance with the conditions stipulated by relevant national laws and
regulations.
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.
5.8 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
7.1 Extraction
Weigh 0.1 g of sample (the weight shall be accurate to 0.1 mg) and put it into a sealable
extraction tank. Measure out 10 mL of the extract (5.4) and 5 mL toluene (5.9) with a
graduated cylinder, add to the sample and place in the sealable extraction tank; seal the
extraction tank and put it into a microwave-assisted extraction device, carry out the
extraction according to the reference extraction procedure given in Table A.1.
After the extraction is completed, open the tank after cooling, cool and centrifuge it;
transfer the lower layer of the aqueous phase solution into a 25 mL volumetric flask,
and wash the organic phase twice with water; incorporate the aqueous phase into the
volumetric flask, and make up the volume with deionized water, then obtain the extract.
7.2 Separation
Take 4 mL of HNO3 solution (5.7), activate the cation exchange column twice, and
wash with deionized water until neutral.
Take 2.5 mL extract, adjust the pH value to 2~4; load the sample, and wash twice with
1mL HNO3 solution (5.8); collect the effluent and washing solution, and then make up
the volume to 10 mL; test it later.
7.3 Drawing of the standard curve
Stepwise dilute the standard working solution of hexavalent chromium (5.6), carry out
separation treatment according to 7.2, and then obtain the standard solution series in
Table 1. According to Table A.2 (Working conditions of the atomic fluorescence
spectrometer) and Table A.3 (Electrothermal evaporation conditions), draw the working
curve.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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