GB10733-2008

Primary chemical - Sodium chloride

第一基准试剂氯化钠

GB 10733-2008 é uma norma nacional chinesa obrigatória vigente: Primary chemical - Sodium chloride. 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 is applicable to the testing and inspection of primary chemical reagent sodium chloride (NaCl). It specifies the characteristics, specifications, testing methods, and packaging requirements for this high-purity chemical. It is mandatory for manufacturers producing primary-grade sodium chloride reagents in China. The standard does not apply to general-purpose or lower-purity grades of sodium chloride.

Requisitos técnicos

The standard outlines the physical and chemical specifications for primary chemical sodium chloride. It mandates a highly precise purity range for the NaCl content, along with strict limits on pH value and clarity. Furthermore, the standard sets maximum allowable limits for a comprehensive list of impurities, including iodides, bromides, sulfates, total nitrogen, phosphates, and heavy metals (such as lead). It also regulates the content of specific metal ions like magnesium, potassium, calcium, iron, and barium to ensure the reagent's ultra-high purity. Compliance with these stringent impurity limits is critical for laboratories relying on this reagent as a primary standard. The standard also references GB/T 602, GB/T 603, and other national standards for the preparation of standard solutions and testing methodologies.

Métodos de ensaio

The primary method for determining the NaCl content is constant-current precision coulometric titration, utilizing a pure silver anode to electrogenerate silver ions that react with chloride ions, with endpoint detection by potentiometry. For impurity analysis, the standard prescribes various techniques: flame atomic absorption spectrometry (FAAS) for metals like magnesium, potassium, and calcium; visual colorimetric and turbidimetric methods for substances like iodides, bromides, sulfates, and heavy metals; and specific general methods outlined in referenced GB/T standards for parameters like pH and water insolubles. Uncertainty calculation for the content determination is also a key part of the testing procedure.

Perguntas frequentes

What products are regulated under GB 10733-2008?

GB 10733-2008 regulates primary chemical reagent sodium chloride, which is a high-purity grade of NaCl used as a primary standard in analytical chemistry.

Are there any updates from the previous version of GB 10733-2008?

Yes, this standard replaces GB 10733-1989. Key updates include the addition of normative references, modifications to the content determination principle and the constant-current coulometric device diagram, and the addition of an uncertainty calculation method for the assay result.

How does GB 10733-2008 differ from general sodium chloride standards?

GB 10733-2008 specifies much stricter purity and impurity limits compared to general-purpose or analytical-grade sodium chloride standards. It also employs highly precise coulometric titration for content determination, which is essential for a primary standard reagent.

The summary above provides a high-level overview of GB 10733-2008. To ensure complete compliance for your 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 10733-2008 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 10733-1989