GB1259-2007

Working chemical - Potassium dichromate

工作基准试剂重铬酸钾

GB 1259-2007 est une norme nationale chinoise obligatoire en vigueur : Working chemical - Potassium dichromate. Secteur : Électronique. Thème principal : Sécurité des produits. Entrée en vigueur : 1 nov. 2007.

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

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Champ d’application

This standard applies specifically to working chemical reagents, namely potassium dichromate (K₂Cr₂O₇), used in titrimetric analysis. It establishes the required characteristics, specifications, testing methods, and packaging rules for this chemical. It is essential for manufacturers and suppliers of benchmark chemical reagents entering the Chinese market.

Exigences techniques

The standard mandates strict physical and chemical parameters for potassium dichromate. The primary requirement dictates that the mass fraction of K₂Cr₂O₇ must be maintained within an extremely tight tolerance range, specifically between 99.95% and 100.05%. Compliance with this purity tier is mandatory for all working benchmark reagents. Additionally, the standard sets maximum allowable limits for various impurities that could affect titration accuracy. Key controlled impurities include water insolubles, chlorides (Cl), sulfates (SO₄), sodium (Na), calcium (Ca), and iron (Fe). The standard also defines the physical properties, requiring the reagent to appear as orange-red crystalline particles or powder.

Méthodes d’essai

To verify compliance, the standard outlines rigorous testing procedures. The primary content determination is performed using a gravimetric potentiometric titration method with a sodium thiosulfate standard titration solution, utilizing specific platinum and calomel electrodes. Impurity tests employ general methods such as flame atomic absorption spectrometry for sodium, and specific visual turbidity and colorimetric comparisons for chlorides, sulfates, calcium, and iron. Water insoluble matter is measured using a dedicated filtration method.

Questions fréquentes

What products are regulated under GB 1259-2007?

This standard regulates potassium dichromate specifically used as a working chemical for volumetric analysis. It sets the mandatory specifications and testing methods for this chemical reagent.

Are there any updates from the previous version of GB 1259-2007?

The current version updated the standard's name and revised the determination method for the main content. It also updated the testing methods for water insolubles and sulfates to align with current general chemical reagent methods.

How does GB 1259-2007 relate to international standards?

The standard references several general chemical reagent standards, some of which are modified or equivalent to ISO standards (e.g., ISO 6353-1:1982 for impurity determination). However, GB 1259-2007 itself is a specific product standard tailored for the Chinese market's working benchmark reagent requirements.

The summary above provides a high-level overview of GB 1259-2007. 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 1259-2007 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 1259-1989