GB/T 32461-2015 in English

《GB/T 32461-2015氨基树脂、酚醛树脂中甲醛含量及其成型品中甲醛迁移量的测定 高效液相色谱法》由TC374（全国质量监管重点产品检验方法标准化技术委员会）归口，主管部门为国家标准化管理委员会。
本标准规定了包装用氨基树脂、酚醛树脂中甲醛含量及其成型品中甲醛迁移量的高效液相色谱测定方法。
本标准适用于包装用氨基树脂、酚醛树脂中甲醛含量及其成型品中甲醛迁移量的测定。涂膜中甲醛迁移量的测定可参照使用。

Determination of formaldehyde in amino resins and phenolic resins and of migration of formaldehyde in their moldings - High performance liquid chromatography

1 Scope

This standard specifies the high performance liquid chromatography for determination of the formaldehyde in amino resins and phenolic resins used for packaging and of migration of formaldehyde in their moldings.

This standard is applicable to the determination of formaldehyde in amino resins and phenolic resins used for packaging and of migration of formaldehyde in their moldings. This standard may also serve as reference for the determination of migration of formaldehyde in paint films.

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 601 Chemical reagent - Preparations of reference titration solutions
GB/T 5009.156 General principle for the determination of migration of packaging materials and their products
GB/T 6682 Water for analytical laboratory use - Specification and test methods

3 Principle

The formaldehyde extract obtained by distillation or soaking of samples is subjected to derivatization reaction with 2,4-Dinitrophenylhydrazine (DNPH) to produce 2,4-dinitrophenylhydrazone. The content of formaldehyde is determined with high performance liquid chromatography (HPLC). The formula of reaction between formaldehyde and 2,4-Dinitrophenylhydrazine is as follows:



Reference spectrograms of 2,4-Dinitrophenylhydrazine and 2,4-dinitrophenylhydrazone are shown in Annex A.

4 Reagents and materials

Unless otherwise specified, all reagents used shall be analytically-pure reagents and water used shall be Class-I water defined in GB/T 6682.

4.1 Isopropanol.

4.2 Acetonitrile: chromatographically pure.

Foreword i
1 Scope
2 Normative references
3 Principle
4 Reagents and materials
5 Apparatus
6 HPLC conditions (recommended)
7 Analytical procedure
8 Result calculation
9 Detection limit
10 Precision
Annex A (Informative) Chromatogram of standards