GB/T 41435-2022 in English

《GB/T 41435-2022玩具材料中硼酸和硼酸盐含量的测定 电感耦合等离子体质谱法》由TC253（全国玩具标准化技术委员会）归口，主管部门为中国轻工业联合会。

Determination of boric acid and salts of boric acid in toy materials - Inductively coupled plasma mass spectrometry

WARNING - Persons using this document should be familiar with normal laboratory practice. This document does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions.

1 Scope

This document describes an inductively coupled plasma mass spectrometry for the determination of boric acid and salts of boric acid in toy materials.

This document is applicable to the determination of boron in toy materials, and the results are counted by boric acid and salts of boric acid.

2 Normative references

The following documents contain requirements which, through reference in this text, constitute indispensable requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.

GB/T 602 Chemical reagent - Preparations of standard solutions for impurity
GB 6675.2 Safety of toys - Part 2: Mechanical and physical properties
GB 6675.4-2014 Safety of toys - Part 4: Migration of certain elements
GB/T 6682 Water for analytical laboratory use - Specification and test methods

3 Terms and definitions

For the purpose of this document, the following terms and definitions apply.

3.1
base material
material upon which coatings may be formed or deposited

3.2
coating
all layers of material formed or deposited on the base material of a toy

Note: It includes paints, varnishes, lacquers, inks, polymers, or other substances of a similar nature, whether they contain metallic particles or not, no matter how they have been applied to the toy, and which may be removed by scraping with a sharp blade

3.3
mass-coloured materials
materials that absorb coloring substances but do not form a coating

Note: Such as wood, fiberboard, cardboard, leather, bones and other loose materials.

3.4
paper and paperboard
paper and paperboard with maximum mass per unit area not greater than 400 g/m2

Note: Paper and paperboard (possibly, fiberboard or cardboard) with the mass per unit area exceeding 400 g/m2 shall be treated as "other mass-coloured materials".

3.5
scraping
mechanical process for removal of coatings down to the base material

Note: Scraping shall not be performed on the base material.

3.6
toy material
all accessible materials on toys

4 Principle

Boric acid and salts of boric acid in toy materials are extracted with hydrochloric acid of specific concentration under specific conditions. After filtration, boron in the sample solution is determined with an inductively coupled plasma mass spectrometer (ICP-MS) and quantified with internal standard method. The content of boric acid and salts of boric acid is calculated based on boron content.

Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents and materials
6 Apparatus
7 Analysis procedure
8 Result calculation
9 Lower limit of quantitation, recovery rate and precision
10 Test report
Annex A (Informative) Reference working conditions for inductively coupled plasma mass spectrometer
Annex B (Informative) Precision
Bibliography