GB6854-2008

pH primary reagent - Disodium hydrogen phosphate

pH 基准试剂磷酸氢二钠

GB 6854-2008 é uma norma nacional chinesa obrigatória vigente: pH primary reagent - Disodium hydrogen phosphate. 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 applies to pH primary reagents, specifically focusing on disodium hydrogen phosphate (Na2HPO4). It is applicable to the inspection, acceptance, and packaging of this chemical reagent used as a pH baseline in analytical chemistry. It is essential for manufacturers and suppliers of laboratory reagents entering the Chinese market.

Requisitos técnicos

The standard specifies the physical properties and chemical purity requirements for disodium hydrogen phosphate. Chapter 4 and Section 5.3 are designated as mandatory provisions. The technical specifications cover the pH value of mixed phosphate solutions, the main content (mass fraction) of the compound, and general pH value limits. Additionally, the standard defines strict impurity limits for various foreign substances. This includes maximum allowable concentrations for water insoluble matter, chlorides, sulfates, nitrates, and heavy metals (such as iron, arsenic, and lead). These parameters ensure the reagent meets the high-purity demands of pH baseline calibration.

Métodos de ensaio

Testing procedures involve potentiometric titration to determine the main content and pH values, adhering to general methods specified in GB/T 9725 and GB/T 9724. Impurity testing utilizes visual turbidimetric and colorimetric comparisons against standard solutions for elements like chlorides and sulfates. For trace elements such as potassium, the standard mandates the use of flame atomic absorption spectrometry (GB/T 9723). Furthermore, tests for magnesium and arsenic follow specific precipitation and colorimetric procedures outlined in referenced national standards. Operators must observe strict safety and health measures due to the toxic and corrosive nature of the reagents used.

Perguntas frequentes

What products are regulated under GB 6854-2008?

This standard regulates pH primary reagents, specifically disodium hydrogen phosphate (Na2HPO4), which is primarily used for establishing pH baselines in analytical laboratories.

Are there any significant updates from the previous GB 6854-1986 version?

The updated version adjusted the tolerance for the mixed phosphate solution pH value to pH(S)II = pH(S)I ± 0.01, renamed the "water solution reaction" parameter to "pH value", and updated the testing methods for pH and heavy metals to use general chemical reagent methods.

How does GB 6854-2008 relate to international ISO standards?

The standard references several ISO standards (such as ISO 6353-1:1982 and ISO 3696:1987) for general chemical reagent testing methods. However, GB 6854-2008 establishes the specific mandatory baseline requirements for the Chinese market, meaning compliance with ISO alone may not be sufficient.

The summary above provides a high-level overview of GB 6854-2008. 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 6854-2008 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 6854-1986