GB10735-2008

Primary chemical - Sodium carbonate anhydrous

第一基准试剂无水碳酸钠

GB 10735-2008 é uma norma nacional chinesa obrigatória vigente: Primary chemical - Sodium carbonate anhydrous. 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, inspection rules, and packaging/marking for primary chemical sodium carbonate anhydrous. It is specifically applicable to the inspection and quality control of this primary reference reagent used in analytical chemistry. Manufacturers and suppliers of high-purity chemical reagents must comply with this standard. It does not apply to general industrial grade sodium carbonate.

Requisitos técnicos

The standard establishes strict specifications for sodium carbonate anhydrous ($Na_{2}CO_{3}$), categorizing it as a primary reference reagent. The mandatory clauses dictate that the content purity must fall within an extremely narrow range of 99.98% to 100.02%. Compliance with these purity limits is strictly enforced for certified reference materials. Additionally, the standard sets maximum allowable limits for various impurities, including chlorides, sulfur compounds, total nitrogen, and heavy metals (as Pb). It also regulates trace metal impurities such as magnesium, aluminum, potassium, calcium, and iron. Supplementary requirements cover physical properties like clarity and water insoluble matter, ensuring the reagent meets the highest analytical grade criteria.

Métodos de ensaio

The primary assay for content determination utilizes constant current precision coulometric titration, based on Faraday's law of electrolysis. This method requires highly specialized equipment, including a high-precision timing constant current source and a controlled temperature standard battery group, as referenced in JJG 153 and JJG 116. For impurity testing, the standard mandates various analytical techniques. Flame atomic absorption spectrometry (referencing GB/T 9723-2007) is used for determining magnesium, potassium, and calcium. Turbidimetric and colorimetric methods are specified for chlorides, sulfates, and heavy metals. Accurate execution of these testing procedures is essential to verify the ultra-high purity requirements.

Perguntas frequentes

What products are regulated under GB 10735-2008?

GB 10735-2008 regulates primary chemical sodium carbonate anhydrous, which is a high-purity reference reagent used primarily in analytical chemistry for precise volumetric and coulometric analysis.

Are there any updates from the previous version of GB 10735-2008?

Yes, GB 10735-2008 replaces the older GB 10735-1989. Key updates include the addition of normative references, modifications to the content determination principle, improved pre-titration methods, and the introduction of an uncertainty calculation method for the assay results.

How does GB 10735-2008 relate to international standards?

The standard references several national standards that are modified or non-equivalent to international standards, such as ISO 6353-1:1982 for impurity determination and ISO 3696:1987 for analytical laboratory water specifications.

The summary above provides a high-level overview of GB 10735-2008. To ensure complete compliance for your primary 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 10735-2008 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 10735-1989