GB/T 19719-2005Jewellery -- Determination of the release of nickel -- Method of spectrometry (English PDF)

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

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.

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.

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

6 Samples

7 Procedure

8 Calculations

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.

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