GB10733-2008

Primary chemical - Sodium chloride

第一基准试剂氯化钠

GB 10733-2008 est une norme nationale chinoise obligatoire en vigueur : Primary chemical - Sodium chloride. Secteur : Électronique. Thème principal : Sécurité des produits. Entrée en vigueur : 1 juin 2009.

L’applicabilité dépend du périmètre du produit, de la voie de certification, des avis des autorités et des règles de transition. Demandez une traduction ou vérifiez la source avant d’utiliser cette fiche pour une décision de conformité.

Aperçu de conformité

Cet aperçu n’est actuellement disponible qu’en anglais.

Champ d’application

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.

Exigences techniques

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.

Méthodes d’essai

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.

Questions fréquentes

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.

Indications d’applicabilité

Type: Produit
CCS: G61
ICS: 71.040.30
Autorité compétente: Ministry of Industry and Information Technology
Comité technique: Ministry of Industry and Information Technology

Relations

Remplace:GB 10733-1989