GB/T 35828-2018 PDF English
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Determination of chromium, arsenic, cadmium, stibium, and lead in cosmetics - Inductively coupled plasma mass spectrometry
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GB/T 35828-2018: PDF in English (GBT 35828-2018) GB/T 35828-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.70
Y 42
Determination of chromium, arsenic, cadmium,
stibium, and lead in cosmetics - Inductively coupled
plasma mass spectrometry
ISSUED ON. FEBRUARY 06, 2018
IMPLEMENTED ON. SEPTEMBER 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
Introduction ... 4
1 Scope ... 5
2 Normative references ... 5
3 Principles ... 5
4 Reagents and materials ... 6
5 Instruments and equipment... 6
6 Analytical procedures ... 7
7 Result calculation ... 9
8 Recovery rate and precision ... 9
9 Tolerance ... 10
Appendix A (Informative) Operating conditions for inductively coupled plasma
mass spectrometer (ICP-MS) ... 11
Determination of chromium, arsenic, cadmium,
stibium, and lead in cosmetics - Inductively coupled
plasma mass spectrometry
1 Scope
This Standard specifies inductively coupled plasma mass spectrometry for the
determination of chromium, arsenic, cadmium, stibium, and lead in cosmetics.
This Standard applies to inductively coupled plasma mass spectrometry for the
determination of chromium, arsenic, cadmium, stibium, and lead in cosmetics
such as creams, body lotions, lip glosses, lipsticks, liquid eyeliners, liquid
foundations, perfumes, nail polishes, bath foams, and shampoos.
The detection limit of this Standard for the determination of chromium, arsenic,
stibium, and lead is 0.07 mg/kg; the limit of quantification is 0.2 mg/kg. The
detection limit for cadmium is 0.04 mg/kg; the limit of quantification is 0.1 mg/kg.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
GB/T 6682 Water for analytical laboratory use - Specification and test
methods
3 Principles
After the sample is digested, it is determined by inductively coupled plasma
mass spectrometer (ICP-MS). ICP-MS consists of two main parts. ion source
and mass spectrometer. After the atomization of the sample solution, it is sent
by the carrier gas to the ICP torch flame. Through evaporation, dissociation,
atomization, ionization, and other processes, it is converted into positively
charged ions. After ion focusing, it enters the mass spectrometer. In the mass
spectrometer, according to the specific mass-to-charge ratio (m/z) of the
element, it is separated and collected. For a certain mass-to-charge ratio, the
mass spectral response value is directly proportional to the number of ions
entering the mass spectrometer, that is, the mass spectral signal intensity is
cosmetics, 0.5 mL~1 mL of hydrofluoric acid (4.4) can be added in advance;
and then DIGEST according to the microwave digestion procedures. After the
digestion is completed, acid-driving shall be carried out, to drive off the residual
hydrofluoric acid. Then ADD 3 mL of nitric acid; COOL, and FILTER the
digestion solution to the 50 mL colorimetric tube pre-added with 1 mL of internal
standard working solution (4.10); DILUTE to volume; SHAKE it well for use. Do
the blank test in the same way.
6.3 Preparation of standard series
PIPETTE 0.00 mL, 1.00 mL, 5.00 mL, 10.00 mL of secondary standard
intermediate solution (4.9) and 0.50 mL, 1.00 mL, 2.00 mL of primary standard
intermediate solution (4.8) respectively into 100 mL volumetric flasks. Then
ADD 2.00 mL of internal standard working solution (4.10) respectively; USE
dilute nitric acid solution (4.3) to dilute to volume; and SHAKE well. The
standard concentrations of chromium, stibium, cadmium, arsenic, and lead are
0.00 ng/mL, 1.00 ng/mL, 5.00 ng/mL, 10.00 ng/mL, 50.00 ng/mL, 100.00 ng/mL,
200.00 ng/mL.
6.4 Reference conditions for inductively coupled plasma mass
spectrometer (ICP-MS)
According to the interference elimination mode provided by the instrument
manufacturer, optimize the determination conditions. If there is no suitable
interference elimination mode, Appendix A can be referred to for optimization.
6.5 Determination
After using the tuning solution to adjust each index of the instrument with the
instrument sensitivity, precision (RSD), oxide, double charge, peak shape, and
resolution meeting the determination requirements, the standard series,
reagent blank, and sample solution are determined respectively. The
determination mass of the elements to be tested and internal standard elements
is shown in Table 1. ENTER each parameter; DRAW a standard curve; and
calculate the regression equation. If the determination result exceeds the linear
range of the standard curve, the sample shall be diluted and then determined.
The blank test, except for the absence of sample, uses exactly the same
analytical procedures, reagents, and dosages. The number of parallel
determinations is not less than two.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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