GB1257-2007

Working chemical - Potassium hydrogen phthalate

工作基准试剂邻苯二甲酸氢钾

GB 1257-2007 é uma norma nacional chinesa obrigatória vigente: Working chemical - Potassium hydrogen phthalate. Setor: Eletrônicos. Foco: Segurança de produtos. Entrada em vigor: 1 de abr. de 2008.

A aplicabilidade depende do escopo do produto, da via de certificação, dos avisos da autoridade competente e das regras de transição. Solicite uma tradução ou verifique a fonte antes de usar este registro em uma decisão de conformidade.

Visão geral de conformidade

Esta visão geral está disponível por enquanto apenas em inglês.

Escopo e aplicabilidade

This standard applies to the inspection of working chemical reagents specifically for potassium hydrogen phthalate used in titration analysis. It is applicable to chemical reagent manufacturers and laboratories verifying the quality of this specific benchmark substance. It does not apply to general industrial-grade or non-benchmark chemical formulations.

Requisitos técnicos

This standard specifies the physical and chemical requirements for potassium hydrogen phthalate as a working benchmark reagent. The core specifications mandate a highly precise content range for the active compound, alongside strict limits for pH value and clarity. Compliance with the specified content range is mandatory for certification. Additionally, the standard sets strict maximum limits for various impurities, including water insolubles, chlorides, sulfur compounds, sodium, iron, and heavy metals (calculated as Lead). These stringent thresholds ensure the reagent's stability and accuracy for analytical titration. The standard also defines specific packaging and labeling criteria, referencing GB 15346 for storage and transportation protocols.

Métodos de ensaio

The standard outlines specific testing procedures to verify compliance. The primary assay for content determination is performed using a gravimetric potentiometric titration method, referencing GB 10737. Impurity testing utilizes general chemical reagent methods, including flame atomic absorption spectrometry for sodium, and visual turbidity or colorimetric comparison methods for chlorides, sulfates, iron, and heavy metals. Operators must observe strict safety and health measures, as some reagents used in these tests are toxic or corrosive.

Perguntas frequentes

What products are regulated under GB 1257-2007?

It applies to working chemical-grade potassium hydrogen phthalate used specifically for titration analysis. It does not apply to general industrial or commercial grades of the chemical.

Are there any updates from the previous version of GB 1257-2007?

The standard was renamed to "Working chemical - Potassium hydrogen phthalate". It updated the content determination method and switched the testing of water insolubles, chlorides, and iron to general chemical reagent methods (GB/T 9738, GB/T 9729, and GB/T 9739).

Is compliance with GB 1257-2007 mandatory?

Yes, Chapters 4 and 5.3.1, 5.3.2 are mandatory, while the remaining clauses are recommended. This means the exact specifications and content determination methods must be strictly followed.

The summary above provides a high-level overview of GB 1257-2007. To ensure complete compliance for your chemical products entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 1257-2007 today to access all detailed parameters, tables, and testing procedures.

Indicações de aplicabilidade

Tipo: Produto
CCS: G61
ICS: 71.040.30
Órgão competente: Ministry of Industry and Information Technology
Comitê técnico: Ministry of Industry and Information Technology

Relações

Substitui:GB 1257-1989