GB6857-2008

pH primary reagent - Potassium hydrogen phthalate

pH 基准试剂邻苯二甲酸氢钾

GB 6857-2008 é uma norma nacional chinesa obrigatória vigente: pH primary reagent - Potassium hydrogen phthalate. Setor: Eletrônicos. Foco: Segurança de produtos. Entrada em vigor: 1 de jun. de 2009.

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 specifies the properties, specifications, testing methods, inspection rules, and packaging for pH primary reagent - Potassium hydrogen phthalate. It is applicable to the inspection and quality control of this specific chemical reagent used as a pH benchmark. Compliance with this standard is mandatory for manufacturers producing pH primary reagents in China. The standard replaces the previous GB 6857-1986.

Requisitos técnicos

The standard outlines the mandatory specifications for potassium hydrogen phthalate, focusing on its purity and physical-chemical properties. Chapter 4 and Section 5.3 are designated as mandatory requirements, while other clauses are recommended. Key parameters regulated include the pH(S)II value of the solution, the main content (purity) percentage, and limits for various impurities such as chlorides, sulfates, and heavy metals. Manufacturers must ensure their product meets these strict purity tiers to be certified as a pH primary reagent. The standard also defines acceptable limits for clarity, loss on drying, and water-insoluble matter, referencing general chemical reagent testing guidelines like GB/T 601 and GB/T 602.

Métodos de ensaio

Testing procedures are detailed to verify compliance with the specified limits. The pH(S)II value is determined using a palladium hydrogen electrode according to GB 6851. Purity (content) is measured following the methods in GB 1257-2007. Impurity testing includes flame atomic absorption spectrometry for sodium, and colorimetric or turbidimetric methods for heavy metals, iron, and ammonium. Specific safety and health measures must be taken during testing due to the toxic or corrosive nature of some reagents used. Sampling and acceptance rules follow HG/T 3921.

Perguntas frequentes

What products are regulated under GB 6857-2008?

It applies to pH primary reagent - Potassium hydrogen phthalate, a high-purity chemical reagent used for pH measurement calibration.

What are the mandatory requirements in GB 6857-2008?

Chapter 4 (Specifications) and Section 5.3 (Determination of pH(S)II value) are mandatory. All other provisions are recommended.

How does GB 6857-2008 differ from the previous version?

It replaces GB 6857-1986, updating the standard name, adjusting the tolerance for the pH(S)II value, and modifying the determination methods for content, chlorides, and iron.

The summary above provides a high-level overview of GB 6857-2008. To ensure complete compliance for your chemical reagents entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 6857-2008 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 6857-1986