GB6856-2008

pH primary reagent - Sodium tetraborate decahydrate

pH 基准试剂四硼酸钠

GB 6856-2008 est une norme nationale chinoise obligatoire en vigueur : pH primary reagent - Sodium tetraborate decahydrate. 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 applies to pH primary reagent sodium tetraborate decahydrate (Na2B4O7·10H2O), primarily utilized in analytical chemistry for pH value determination and calibration. It is specifically designed for the inspection and quality control of pH基准试剂 and does not apply to general industrial-grade borax.

Exigences techniques

The standard specifies stringent physical and chemical requirements for sodium tetraborate decahydrate. It mandates a specific pH(S)II value range for a 0.01mol/kg solution at 25°C, ensuring its viability as a reliable pH primary standard. Compliance with this pH specification is strictly mandatory. Furthermore, the standard outlines the required purity level, indicating a minimum mass fraction percentage for the active ingredient. It also sets maximum allowable limits for various impurities, including chlorides, sulfates, phosphates, and heavy metals (such as lead and iron), to prevent interference in precise analytical applications. Additional quality parameters include clarity test limits and specific thresholds for insoluble matter in hydrochloric acid. Manufacturers must ensure their product meets all specified impurity thresholds to achieve certification.

Méthodes d’essai

The standard details various testing procedures to verify compliance. The pH value determination must be conducted according to GB 6851 using a platinum double-hydrogen electrode. Content assay is performed via an acid-base titration method utilizing standard sodium hydroxide and mannitol. Impurity testing involves standardized chemical and instrumental methods, such as flame atomic absorption spectrometry for potassium determination, and visual colorimetric/turbidimetric comparisons for impurities like chlorides, sulfates, and heavy metals. Strict adherence to these specified testing protocols is required for valid certification.

Questions fréquentes

What products are regulated under GB 6856-2008?

This standard applies to pH primary reagent sodium tetraborate decahydrate (Na2B4O7·10H2O), primarily used for pH value determination and calibration in analytical laboratories.

Are there any updates from the previous version of GB 6856-2008?

The updated standard revised the pH(S)II value accuracy, modified the content determination method, and updated the testing methods for impurities like phosphates and iron to align with current general chemical reagent methods.

Is compliance with GB 6856-2008 mandatory?

Chapter 4 and clause 5.3 are mandatory, while all other technical requirements and testing methods are recommended.

The summary above provides a high-level overview of GB 6856-2008. 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 6856-2008 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 6856-1986