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GB/T 32461-2015: Determination of formaldehyde in amino resins and phenolic resins and of migration of formaldehyde in their moldings -- High performance liquid chromatography
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GB/T 32461-2015: Determination of formaldehyde in amino resins and phenolic resins and of migration of formaldehyde in their moldings -- High performance liquid chromatography

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Determination of formaldehyde in amino resins and phenolic resins and of migration of formaldehyde in their moldings.High performance liquid chromatography ICS 83.140.01 G32 National Standards of People's Republic of China Amino resin, phenolic resin in formaldehyde content And the amount of formaldehyde in its molded product High performance liquid chromatography 2015-12-31 released 2016-07-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Management Committee released Directory Preface I 1 Scope 1 2 normative reference document 1 Principle 1 4 Reagents and Materials 1 5 instruments and equipment 2 6 Chromatography (HPLC) conditions (recommended) 3 7 Analysis Step 3 8 results calculated 3 9 detection limit 5 10 precision 5 Appendix A (informative) Standard Chromatogram Figure 6

Foreword

This standard is drafted in accordance with the rules given in GB/T 1.1-2009. This standard is proposed and centralized by the National Standardization Technical Committee for Quality Assurance (SAC/TC374). The main drafting unit of this standard. National Packaging Product Quality Supervision and Inspection Center (Guangzhou), Guangzhou Quality Supervision and Inspection Research Institute. The main drafters of this standard. Xi Shaofeng, Xie Yongping, Li Huiyong, Xie Wenjie, Tan Jianhua, Wang Jicai, Lai Hongjuan, Zhang can be winter, Huang Jinchao, Zhang Hu Song, Shen Congwen, Jia Fang, Huang Guangchi. Amino resin, phenolic resin in formaldehyde content And the amount of formaldehyde in its molded product High performance liquid chromatography

1 Scope

This standard specifies the use of amino resin for packaging, formaldehyde content in phenolic resin and the amount of formaldehyde in its molded product by high performance liquid chromatography Method. This standard applies to the packaging of amino resin, phenolic resin in formaldehyde content and the formation of formaldehyde in the determination of migration. Coating a Determination of aldehyde migration can be used.

2 normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article Pieces. For undated references, the latest edition (including all modifications) applies to this document. Preparation of standard titration solution for GB/T 601 chemical reagents General rules for immersion test of packaging materials and their products for foodstuffs GB/T 5009.156 GB/T 6682 Analytical laboratory water specifications and test methods

3 principle

The samples were distilled or immersed in the formaldehyde extract, and 2,4-dinitrophenylhydrazine (2,4-dinitrophenylhydrazine, DNPH) The derivatization reaction was carried out to produce 2,4-dinitrophenylhydrazone, and the content of formaldehyde was determined by high performance liquid chromatography. Formaldehyde and 2,4-dinitrophenylhydrazine The reaction is as follows. 􀜏􀜏 􀜏􀜏 􀜏􀜏􀜏 NHNH2 NO2 NO2 HCHO → 􀜏􀜏 􀜏􀜏 􀜏􀜏􀜏 NHN CH2􀪅 NO2 NO2 H2O The reference spectra of 2,4-dinitrophenylhydrazine and 2,4-dinitrobenzone are shown in Appendix A.

4 Reagents and Materials

Unless otherwise stated, all reagents are of analytical grade and water is a primary water specified in GB/T 6682. 4.1 isopropyl alcohol. 4.2 acetonitrile (chromatographic purity). 4.3 dinitrophenylhydrazine (DNPH). 4.4 concentrated phosphoric acid (85%). 4.5 1% dinitrophenylhydrazine (DNPH) solution. DNPH was first purified by recrystallization from 25% aqueous acetonitrile and the purified ...