GB1253-2007

Working chemical - Sodium chloride

工作基准试剂氯化钠

GB 1253-2007 est une norme nationale chinoise obligatoire en vigueur : Working chemical - Sodium chloride. Secteur : Électronique. Thème principal : Sécurité des produits. Entrée en vigueur : 1 avr. 2008.

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

GB 1253-2007 applies to working chemical reagents specifically sodium chloride (NaCl) used for titration analysis. It is designed for the inspection and verification of high-purity sodium chloride utilized as a working standard in analytical chemistry. This standard is mandatory for manufacturers producing benchmark reagents for volumetric analysis in China.

Exigences techniques

This standard specifies the physical properties and stringent chemical specifications for working基准 grade sodium chloride. The core requirements mandate a highly concentrated NaCl content, strictly controlled within a very narrow tolerance band to ensure analytical precision. Additionally, the standard sets explicit limits on the pH value when dissolved in water, ensuring the solution remains within a neutral range suitable for sensitive titrations. The standard rigorously controls trace impurities to prevent interference in analytical applications. It establishes maximum allowable limits for various specific impurities, including water insolubles, iodides, bromides, sulfates, and phosphates. Strict adherence to these impurity thresholds is critical for maintaining the reagent's benchmark status. Heavy metal contamination and residual nitrogen compounds are also tightly regulated under this standard. Parameters for trace metals such as magnesium, potassium, calcium, iron, and barium are defined to guarantee the chemical's stability and reactivity. The standard also dictates specific packaging and marking requirements to preserve the reagent's integrity during storage and transportation.

Méthodes d’essai

The standard employs a variety of precise analytical methods to verify compliance. The primary NaCl content is determined using a gravimetric potentiometric titration method with a silver nitrate standard solution, utilizing specific electrodes. Trace metals like magnesium, potassium, and calcium are quantified via flame atomic absorption spectrometry. Other impurities, such as sulfates, phosphates, and heavy metals, are measured using standardized colorimetric and turbidimetric methods, comparing sample solutions against reference standard solutions.

Questions fréquentes

What products are regulated under GB 1253-2007?

This standard regulates working chemical reagents specifically in the form of sodium chloride (NaCl) used for titration analysis. It sets the benchmark for chemical purity and impurity thresholds in analytical laboratories.

Are there any updates from the previous version of GB 1253-2007?

The 2007 version revised the standard's title and updated the determination method for NaCl content. Additionally, testing methods for pH, water insolubles, sulfates, total nitrogen, phosphates, iron, and heavy metals were updated to align with current general chemical reagent methods.

How does GB 1253-2007 differ from ISO standards?

While many testing methods reference ISO 6353-1:1982 (via equivalent GB/T standards), GB 1253-2007 includes specific Chinese regulatory requirements, such as unique packaging specifications and the mandatory use of the gravimetric potentiometric titration method (GB 10737) for content determination.

The summary above provides a high-level overview of GB 1253-2007. 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 1253-2007 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 1253-1989