QB/T 5291-2018 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| QB/T 5291-2018 | English | 185 |
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Determination of hexavalent chromium in cosmetics
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QB/T 5291-2018: Determination of hexavalent chromium in cosmetics---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/QBT5291-2018
LIGHT INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.70
Classification No.. Y42
Filing No.. 65903-2018
Determination of hexavalent chromium in cosmetics
Issued on. OCTOBER 22, 2018
Implemented on. APRIL 01, 2019
Issued by. Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword... 3
Introduction... 4
1 Scope... 5
2 Normative references... 5
3 Method 1 -- Diphenylcarbazide spectrophotometry... 5
4 Method 2 -- Ion chromatography-inductively coupled plasma mass spectrometry... 8
Appendix A (Informative) Reference conditions of instrument... 12
Appendix B (Informative) Ion chromatography-mass spectrograms of standard
solutions and samples... 13
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by China National Light Industry Federation.
This standard shall be under the jurisdiction of the National Standardization Technical
Committee of Flavor, Flavor and Cosmetics (SAC/TC 257).
Drafting organizations of this standard. Dalian Institute of Product Quality Inspection
(National Center for Quality Supervision and Inspection of Daily Chemical Products),
Dalian Food Inspection Institute, Shanghai Institute of Daily Chemical Industry
(National Center for Quality Supervision and Inspection of Flavor and Cosmetics).
The main drafters of this standard. Zhao Tong, Mao Xiqin, Shen Min, Zhou Huimin,
Niu Jinhui, Cai Qiang, Jia Zhenqiang.
This standard is published for the first time.
1 Scope
This standard specifies the methods for the determination of hexavalent chromium in
cosmetics, by diphenylcarbazide spectrophotometry and ion chromatography-
inductively coupled plasma mass spectrometry.
This standard applies to the determination of hexavalent chromium in cosmetics. When
the sample weight is 2 g, the detection limit of diphenylcarbazide spectrophotometry is
0.25 mg/kg, the quantification limit is 0.83 mg/kg; the detection limit of ion
chromatography-inductively coupled plasma mass spectrometry is 0.010 mg/kg, the
quantification limit is 0.033 mg/kg.
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
3 Method 1 -- Diphenylcarbazide spectrophotometry
3.1 Principle
After the sample is extracted by the alkaline leaching solution, the hexavalent
chromium in the leaching solution reacted with diphenylcarbazide in an acidic solution,
to form a purple-red complex, which was determined by spectrophotometry, at a
wavelength of 540 nm.
3.2 Reagents
Unless otherwise specified, the reagents are of analytical grade. The water is the first
grade water, which is specified in GB/T 6682.
3.3 Instruments
3.4 Analytical procedures
3.5 Result calculation
Calculate the hexavalent chromium, X, in the specimen, according to formula (1).
3.6 Recovery and precision
When the standard addition concentration is in the range of 0.5 mg/L ~ 10.0 mg/L, the
recoveries are in the range of 88.4% ~ 102.9%, the precisions are in the range of 1.9%
~ 7.1%.
3.7 Tolerance
The absolute difference, between the results of two independent determinations, which
are obtained under repeatability conditions, shall not exceed 10% of the arithmetic
mean.
4 Method 2 -- Ion chromatography-inductively coupled plasma mass spectrometry
4.1 Principle
After the samples are extracted with alkaline leaching solution, the leaching solution is
determined by ion chromatography-inductively coupled plasma mass spectrometry,
AND quantified by external standard method.
4.2 Reagents
Unless otherwise specified, the reagents are of analytical grade. The water is the first
grade water, which is specified in GB/T 6682.
4.3 Instruments and equipment
4.3.1 Ion chromatography-inductively coupled plasma mass spectrometer.
4.3.2 Ultrasonic generator. Constant temperature (60 ± 1) °C.
4.3.3 Analytical balance. Sensitivity 0.0001 g.
4.3.4 Graduated centrifuge tube (polyethylene or polypropylene). Specification 50 mL.
4.4 Analytical procedures
4.4.1 Pre-treatment of sample
Accurately weigh (0.5 g ~ 2 g, accurate to 0.0001 g) of the sample, into a 50 mL
graduated centrifuge tube. Add 20.0 mL of extract (4.2.8) and 0.5 mL of buffer (4.2.9).
Completely submerge the sample in the extract. Shake well. Carry out ultrasonic
extraction, at 60 °C for 20 min. Take it out. After cooling to room temperature, use
water to make the volume to 25.0 mL. Add 2.0 g of activated carbon powder. Shake
well. Use filter paper to filter it. Discard the first 1 mL of filtrate. Collect the filtrate.
Use microporous filter membrane (4.2.13) to filter the collected filtrate. Prepare for
determination. Meanwhile do a reagent blank test.
4.4.3 Determination
The instrument is tuned and set, to measure the standard curve solution, reagent blank
solution, sample solution in sequence. See Appendix A, for instrument reference
conditions.
4.6 Recovery and precision
When the standard concentration is in the range of 0.10 mg/kg ~ 10 mg/kg, the recovery
rate is 86.0% ~ 103.7% AND the precision is in the range of 1.1% ~ 8.1%.
4.7 Tolerance
The absolute difference, between the results of two independent determinations, which
are obtained under repeatability conditions, is not more than 10 % of the arithmetic
mean.
Appendix A
(Informative)
Reference conditions of instrument
A.1 Ion chromatography conditions
The ion chromatography conditions are as follows.
A.2 Inductively coupled plasma mass spectrometry conditions
Inductively coupled plasma mass spectrometry conditions are as follows.
Appendix B
(Informative)
Ion chromatography-mass spectrograms of standard solutions and samples
See Figure B.1 and Figure B.2, for the ion chromatogram-mass spectrum of the standard
solution and sample.
QB/T 5291-2018
LIGHT INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.70
Classification No.. Y42
Filing No.. 65903-2018
Determination of hexavalent chromium in cosmetics
Issued on. OCTOBER 22, 2018
Implemented on. APRIL 01, 2019
Issued by. Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword... 3
Introduction... 4
1 Scope... 5
2 Normative references... 5
3 Method 1 -- Diphenylcarbazide spectrophotometry... 5
4 Method 2 -- Ion chromatography-inductively coupled plasma mass spectrometry... 8
Appendix A (Informative) Reference conditions of instrument... 12
Appendix B (Informative) Ion chromatography-mass spectrograms of standard
solutions and samples... 13
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by China National Light Industry Federation.
This standard shall be under the jurisdiction of the National Standardization Technical
Committee of Flavor, Flavor and Cosmetics (SAC/TC 257).
Drafting organizations of this standard. Dalian Institute of Product Quality Inspection
(National Center for Quality Supervision and Inspection of Daily Chemical Products),
Dalian Food Inspection Institute, Shanghai Institute of Daily Chemical Industry
(National Center for Quality Supervision and Inspection of Flavor and Cosmetics).
The main drafters of this standard. Zhao Tong, Mao Xiqin, Shen Min, Zhou Huimin,
Niu Jinhui, Cai Qiang, Jia Zhenqiang.
This standard is published for the first time.
1 Scope
This standard specifies the methods for the determination of hexavalent chromium in
cosmetics, by diphenylcarbazide spectrophotometry and ion chromatography-
inductively coupled plasma mass spectrometry.
This standard applies to the determination of hexavalent chromium in cosmetics. When
the sample weight is 2 g, the detection limit of diphenylcarbazide spectrophotometry is
0.25 mg/kg, the quantification limit is 0.83 mg/kg; the detection limit of ion
chromatography-inductively coupled plasma mass spectrometry is 0.010 mg/kg, the
quantification limit is 0.033 mg/kg.
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
3 Method 1 -- Diphenylcarbazide spectrophotometry
3.1 Principle
After the sample is extracted by the alkaline leaching solution, the hexavalent
chromium in the leaching solution reacted with diphenylcarbazide in an acidic solution,
to form a purple-red complex, which was determined by spectrophotometry, at a
wavelength of 540 nm.
3.2 Reagents
Unless otherwise specified, the reagents are of analytical grade. The water is the first
grade water, which is specified in GB/T 6682.
3.3 Instruments
3.4 Analytical procedures
3.5 Result calculation
Calculate the hexavalent chromium, X, in the specimen, according to formula (1).
3.6 Recovery and precision
When the standard addition concentration is in the range of 0.5 mg/L ~ 10.0 mg/L, the
recoveries are in the range of 88.4% ~ 102.9%, the precisions are in the range of 1.9%
~ 7.1%.
3.7 Tolerance
The absolute difference, between the results of two independent determinations, which
are obtained under repeatability conditions, shall not exceed 10% of the arithmetic
mean.
4 Method 2 -- Ion chromatography-inductively coupled plasma mass spectrometry
4.1 Principle
After the samples are extracted with alkaline leaching solution, the leaching solution is
determined by ion chromatography-inductively coupled plasma mass spectrometry,
AND quantified by external standard method.
4.2 Reagents
Unless otherwise specified, the reagents are of analytical grade. The water is the first
grade water, which is specified in GB/T 6682.
4.3 Instruments and equipment
4.3.1 Ion chromatography-inductively coupled plasma mass spectrometer.
4.3.2 Ultrasonic generator. Constant temperature (60 ± 1) °C.
4.3.3 Analytical balance. Sensitivity 0.0001 g.
4.3.4 Graduated centrifuge tube (polyethylene or polypropylene). Specification 50 mL.
4.4 Analytical procedures
4.4.1 Pre-treatment of sample
Accurately weigh (0.5 g ~ 2 g, accurate to 0.0001 g) of the sample, into a 50 mL
graduated centrifuge tube. Add 20.0 mL of extract (4.2.8) and 0.5 mL of buffer (4.2.9).
Completely submerge the sample in the extract. Shake well. Carry out ultrasonic
extraction, at 60 °C for 20 min. Take it out. After cooling to room temperature, use
water to make the volume to 25.0 mL. Add 2.0 g of activated carbon powder. Shake
well. Use filter paper to filter it. Discard the first 1 mL of filtrate. Collect the filtrate.
Use microporous filter membrane (4.2.13) to filter the collected filtrate. Prepare for
determination. Meanwhile do a reagent blank test.
4.4.3 Determination
The instrument is tuned and set, to measure the standard curve solution, reagent blank
solution, sample solution in sequence. See Appendix A, for instrument reference
conditions.
4.6 Recovery and precision
When the standard concentration is in the range of 0.10 mg/kg ~ 10 mg/kg, the recovery
rate is 86.0% ~ 103.7% AND the precision is in the range of 1.1% ~ 8.1%.
4.7 Tolerance
The absolute difference, between the results of two independent determinations, which
are obtained under repeatability conditions, is not more than 10 % of the arithmetic
mean.
Appendix A
(Informative)
Reference conditions of instrument
A.1 Ion chromatography conditions
The ion chromatography conditions are as follows.
A.2 Inductively coupled plasma mass spectrometry conditions
Inductively coupled plasma mass spectrometry conditions are as follows.
Appendix B
(Informative)
Ion chromatography-mass spectrograms of standard solutions and samples
See Figure B.1 and Figure B.2, for the ion chromatogram-mass spectrum of the standard
solution and sample.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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