Standard No.:	GB/T 19719-2026
English Name:	Jewellery—Determination of the release of nickel—Method of spectrometry
Chinese Name:	首饰 镍释放量的测定 光谱法
Professional Classification:	GB    National Standard
Source Content Issued by:	SAMR, SAC
Issued on:	2026-04-30
Implemented on:	2026-11-1
Status:	to be valid
Superseding:	GB/T 19719-2005 Jewellery - Determination of the release of nickel - Method of spectrometry
Target Language:	English
File Format:	PDF
Word Count:	10500 words
Translation Price(USD):	315.0
Delivery:	via email in 1 business day

GB/T 19719-2026 Jewellery — Determination of the release of nickel — Method of spectrometry 1 Scope This document describes the testing method for the release amount of nickel in jewellery. This document is applicable to jewellery worn on body piercings and jewellery in direct contact with human skin for a long time. Other nickel-containing products can be used this document as a reference. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 6682 Water for analytical laboratory use - Specification and test methods GB 28480 Jewellery - Technical requirements for safety GB/T 28485 Coated adornment - Detection of nickel release - Method for simulation of wear and corrosion 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 homogeneous jewellery jewellery with uniform overall material and cannot be separated into different materials Note: Overlay jewellery is not homogeneous jewellery. 3.2 sample area the surface area of jewellery that comes into prolonged direct contact with the skin or with the pierced areas of the body 4 Principle The samples to be tested for nickel release shall be immersed in artificial sweat for one week to eliminate interference. The concentration of nickel ions dissolved in the artificial sweat can be determined by atomic absorption spectroscopy or inductively coupled plasma spectroscopy. The nickel release is in micrograms per square centimeter per week [μg/(cm2·week)]. Jewellery with non-nickel coatings that come into prolonged direct contact with the skin shall first be tested in accordance with GB/T 28485, and then tested according to the procedures specified in this document. Before the test, it is possible to first determine whether there is releasable nickel in the sample by following Annex A. 5 Reagents During the analysis, unless otherwise specified, only reagents of recognized analytical grade and and free of nickel and Grade 2 water specified in GB/T 6682 are used. 5.1 Sodium chloride. 5.2 Urea. 5.3 Sodium hydroxide: solid, with a purity not less than 98%. 5.4 DL-lactic acid: with a mass fraction greater than 88%. 5.5 Hybrochloric acid: with a mass fraction of 36% to 38%. 5.6 Nitric acid: with a mass fraction of 65% to 68%. 5.7 1mol/L sodium hydroxide solution: weigh (4.00 ± 0.01) g of sodium hydroxide (5.3) into a 100mL beaker, add 50mL of water, stir and cool to room temperature. Transfer the solution to a 100mL volumetric flask, dilute to the scale with water, and mix well. 5.8 0.1mol/L sodium hydroxide solution: measure 25mL of 1mol/L sodium hydroxide solution (5.7) into a 250mL volumetric flask, dilute to the scale with water, and mix well. 5.9 0.1mol/L hydrochloric acid solution: measure 1mL of hydrochloric acid (5.5) into a 100mL volumetric flask, dilute to the scale with water, and mix well. 5.10 Dilute nitric acid (with a mass fraction of approximately 5%): measure 30mL of nitric acid (5.6) into a 500mL beaker pre-filled with 350mL of water. Stir and cool to room temperature, then transfer the solution to a 500mL volumetric flask, dilute to the scale with water, and mix well. 5.11 Degreasing solution: weigh 5g of nonionic surfactant (such as sodium dodecyl benzene sulfonate or sodium alkyl aryl sulfonate) and dissolve it in 1,000mL of water. Other neutral commercial detergents can also be used after dilution. 5.12 Wax or paint (applicable to the electroplating industry): apply one or more layers on the surface of the sample to prevent nickel from escaping from the non-tested surface. Note 1: When using wax, immerse the sample in molten wax. Without changing the sample's properties, preheating the sample at a low temperature can improve the adhesion of the wax. Note 2: To cover cracks and fissures, it may be necessary to apply 2 to 3 layers of paint to achieve the desired effect. A low-power magnifying glass (such as 2 to 5 times) can be used to visually inspect the coverage effect. 5.13 Nickel standard stock solution (100μg/mL): weigh 0.448g of hexahydrate nickel sulfate, dissolve it in water, transfer into a 1,000mL volumetric flask, and dilute to the scale. Alternatively, a certified national standard solution can be purchased for preparation.

Contents Foreword II 1 Scope 2 Normative references 3 Terms and definitions 4 Principle 5 Reagents 6 Apparatus 7 Sample 7.1 Number of samples 7.2 Sample area 7.3 Sample degreasing 8 Analysis procedure 8.1 Preparation of artificial sweat 8.2 Release process 8.3 Blank test 8.4 Determination of nickel 9 Result calculation 9.1 Release of nickel 9.2 Interpretation of results 10 Test report Annex A (Normative) Preliminary screening of nickel content in samples before nickel release test A.1 General A.2 Principle A.3 Reagents A.4 Apparatus A.5 Test procedures A.6 Interpretation of results Annex B (Informative) Pre-treatment of body piercing components and jewellery in direct contact with human skin for a long time before conducting nickel release tests B.1 General B.2 Principle B.3 Determination of nickel release test method B.4 Determination of homogeneous jewellery and non-homogeneous jewellery surfaces B.5 Determination method of surface area Annex C (Informative) Jewellery made of heterogeneous materials