GB6853-2008

pH primary reagent - Potassium dihydrogen phosphate

pH 基准试剂磷酸二氢钾

GB 6853-2008 est une norme nationale chinoise obligatoire en vigueur : pH primary reagent - Potassium dihydrogen phosphate. 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 the inspection and quality control of pH primary reagent potassium dihydrogen phosphate. It is specifically designed for chemical reagent manufacturers and laboratories utilizing this substance as a pH benchmark. It is mandatory for all manufacturers producing this specific pH primary reagent in China. The standard covers the reagent's properties, specifications, testing methods, inspection rules, and packaging requirements, referencing related standards like GB 6851 and GB/T 9724.

Exigences techniques

GB 6853-2008 specifies stringent technical requirements for potassium dihydrogen phosphate ($KH_{2}PO_{4}$) used as a pH primary reagent. The core mandatory specifications include the pH(S)II value for mixed phosphate solutions and the precise content of $KH_{2}PO_{4}$, which must be $\geq 99.5\%$. The standard also defines limits for various physical and chemical parameters, including pH value, clarity, loss on drying, and water-insoluble matter. Manufacturers must ensure compliance with these specific chemical purity thresholds. Furthermore, it sets maximum allowable limits for impurities such as chlorides, sulfates, nitrates, ammonium salts, sodium, iron, arsenic, and heavy metals (as Pb). These strict impurity controls are essential for maintaining the reagent's benchmark status, as outlined in GB 6851.

Méthodes d’essai

The standard outlines specific testing procedures to verify compliance. Key methods include potentiometric titration for determining the $KH_{2}PO_{4}$ content and flame atomic absorption spectrometry (per GB/T 9723-2007) for sodium content. Other evaluations involve visual turbidity comparisons for chlorides and sulfates, and specific colorimetric methods for iron, arsenic, and heavy metals. Accurate execution of these testing methods is critical for certification.

Questions fréquentes

What products are regulated under GB 6853-2008?

This standard regulates pH primary reagent potassium dihydrogen phosphate, a chemical used as a benchmark for pH measurement in laboratories.

Are the requirements in GB 6853-2008 mandatory?

Yes, Chapter 4 and clause 5.3 are mandatory, while other clauses are recommended. Compliance with the mandatory specifications is required for market access.

What are the main updates in GB 6853-2008 compared to the 1986 version?

The 2008 version adjusts the pH(S)II value tolerance and updates testing methods for pH, insoluble matter, ammonium, and heavy metals to align with general chemical reagent testing standards.

The summary above provides a high-level overview of GB 6853-2008. 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 6853-2008 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 6853-1986