GB/T 19719-2005 PDF English
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| GB/T 19719-2005 | English | 85 |
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Jewellery -- Determination of the release of nickel -- Method of spectrometry
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GB/T 19719-2005: Jewellery -- Determination of the release of nickel -- Method of 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/GBT19719-2005
GB
ICS 39.060
Y 88
NATIONAL STANDARD
Jewellery - Determination of the Release of
Nickel - Method of Spectrometry
Issued on. MARCH 23, 2005
Implemented on. SEPTEMBER 1, 2005
Jointly Issued by. General Administration of Quality Supervision, Inspection
and Quarantine of the People's Republic of China;
Standardization Administration Committee of the People's
Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative References... 4
3 Principle... 4
4 Reagents... 4
5 Apparatus... 5
6 Samples... 6
7 Procedure... 7
8 Calculations... 8
9 Test Report... 9
Appendix A... 10
Appendix B... 12
Appendix C... 14
Appendix D... 15
Appendix E... 16
Appendix F... 17
Foreword
This Standard is modified in relation to European Standard EN 1811.1998 "Reference Test
Method for Release of Nickel from Products Intended to Come into Direct and Prolonged
Contact with the Skin" (English edition).
In order to be convenient for application, this Standard makes the following editorial changes.
a) "This European Standard" was changed into "this Standard";
b) The comma "," served as decimal point is replaced by the decimal point ".";
c) "cm3" is replaced by "mL";
d) The Foreword of the international standard was deleted;
e) Add Appendix E (Informative) for guidance.
Appendixes A, B, C, D, E and F of this Standard are informative.
This Standard was proposed by China National Light Industry Council.
This standard shall be under the jurisdiction of National Technical Committee on Jewellery of
Standardization Administration of China (SAC/TC 256).
Drafting organizations of this Standard. National Jewellery Quality Supervision and
Inspection Center, National Center of Quality Supervision & Inspection on Gold-Silver
Products (Nanjing), and National Center of Quality Supervision & Inspection on Gold-Silver
Products (Shanghai).
Chief drafting staffs of this Standard. Li Wujun, Wang Donghui, Fang Mingxu, Fan Jifang, Li
Yukun, and Li Suqing.
Jewellery - Determination of the Release of
Nickel - Method of Spectrometry
1 Scope
This Standard specifies a method for simulating the release of nickel from jewellery, in order
to determine whether the item releases nickel at a rate greater than 0.5 μg/(cm2·week).
This Standard is applicable to the determination of the release of nickel from jewellery, as
well as the products intended to come into direct and prolonged contact with the skin (see
4.3.2 of GB 11887-2002).
2 Normative References
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this Standard. For dated references, subsequent amendments to, or
revisions of, any of these publications do not apply. However, parties to agreements based on
this Standard are encouraged to investigate the possibility of applying the most recent editions
of the normative documents indicated below. For undated references, the latest edition of the
normative document referred to applies.
GB 11887-2002 Jewellery — Fineness of Precious Metal Alloys and Designation (ISO
9202.1991, NEQ)
3 Principle
The item to be tested for nickel release is placed in an artificial sweat test solution for one
week. The concentration of dissolved nickel in the solution is determined by atomic
absorption spectrometry, inductively-coupled plasma spectrometry or other appropriate
analytical method. The nickel release is expressed in micrograms per square centimetre per
week [μg/(cm2·week)].
4 Reagents
Except where indicated, all reagents, distilled water or deionized water or equivalent shall be
of recognized analytical pure grade.
4.1 Sodium chloride.
4.2 Urea.
4.6 Nitric acid. 65 % (m/m), ρ = 1.40 g/mL..
4.7 Dilute ammonia solution. 1%(m/m). Transfer 10 mL of ammonia solution (4.5) into a
250 mL beaker containing 100 mL of deionized water. Stir and cool to room temperature.
Transfer the solution to a 250 mL volumetric flask and make up to the volume with deionized
water.
4.8 Dilute nitric acid. approximately 5 % (m/m). Transfer 15 mL of nitric acid (4.6) into a
500 mL beaker containing 100 mL of deionized water (4.3). Stir and cool to room temperature.
Transfer the solution to a 250 mL volumetric flask and make up to the volume with deionized
water.
5 Apparatus
5.1 A pH-meter, accurate to ±0.02 pH.
5.2 An analytical spectrometer. The instrument shall, after optimization, meet the
performance criteria given in 5.2.1 and 5.2.2.It is recommended that either an
inductively-coupled plasma-optical emission spectrometer or an electrothermal excitation
atomic absorption spectrometer is used.
5.2.1 Minimum precision. The standard deviation of 10 measurements of the absorption of a
full matrix calibration solution containing 0.05 mg nickel per litre shall not exceed 10 %.
5.3 Thermostatically controlled water-bath or oven, capable of maintaining a temperature of
(30 ± 2) ℃.
5.4 A vessel with lid, both composed of a non-metallic, nickel-free and nitric-acid-resistant
material, such as glass and/or polypropylene and/or polytetrafluoroethylene and/or
polystyrene.
6 Samples
6.1 Sample area
6.1.1 Definition of sample area
Only the surfaces of an item that comes into direct and prolonged contact with the skin shall
be analyzed. In this standard such surfaces are defined as “sample area”.
6.2 Sample preparation
Gently swirl the sample for 2 min in degreasing solution (4.9) at room temperature. Rinse
thoroughly with deionized water and dry. After degreasing, items should be handled with
plastic forceps or clean protective gloves.
6.3 Reference disc
As a quality control check, the nickel release from a reference disc may be determined (see
Appendix B).
7 Procedure
7.1 Preparation of test solution
7.1.1 Preparation of deionized and aerated water
Fill a tall-form 2 L beaker with deionized water (4.3), saturate with air by attaching a gas
distribution tube to a cork and positioning the lower end of the tube on the bottom of the
beaker.
7.1.2 Preparation of artificial sweat
The artificial sweat consists of deionized and aerated water containing.
7.2 Release procedure
7.2.1 Place the sample, suspended by its holder, in the test vessel (5.4). Add an amount of
test solution corresponding to approximately 1 mL per cm2 sample area. The suspended
sample shall be totally immersed. However, it is not essential to immerse areas which are
completely protected by wax or lacquer.
7.3 Determination of nickel
Determine the nickel content of the test solution using an analytical spectrometer (see 5.2).
7.4 Number of replicates
Whenever possible, the determination shall be carried out on at least two identical samples.
8 Calculations
8.1 Nickel release
The nickel release of a sample, d, expressed in micrograms per square centimetre per week
[μg/(cm2·week)], is given by the equation.
8.2 Interpretation of results
Multiply the result, d, established in 8.1 by 0.1 to obtain an adjusted analytical figure. A
sample shall be deemed to have a nickel release of more than 0.5 μg/(cm2·week) if the
adjusted figure is greater than 0.5 μg/(cm2·week).
9 Test Report
— identification of the sample including source, date of receipt, form;
— reference standard (include issued or published year);
— for each replicate, the nickel release and its adjusted figure, which can be calculated
according to the requirement of Chapter 8;
— if relevant, details of any deviations from this standard method;
— any unusual features observed during the determination;
— date of test;
— identification of laboratory carrying out the analysis;
— signature of laboratory manager and operator.
Appendix A
(Informative)
Statistical Uncertainty of the Test Procedure and Interpretation of Results
Most chemical test methods are designed to measure the total amount of a substance in a
material. This usually makes it possible to obtain an accurate result with close statistical
agreement between laboratories because there is an absolute or true value. The test method in
this Standard measures the rate of soluble nickel release from an item. With this type of
chemical test the result is dependent upon the specified conditions of test, and there is no
absolute or true value. Consequently, it is more difficult to obtain close statistical agreement
between laboratories when performing such migration (or release) tests.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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