GB1259-2007
Working chemical - Potassium dichromate
工作基准试剂 重铬酸钾
GB 1259-2007 is a current mandatory Chinese national standard for Working chemical - Potassium dichromate. It appears in the Electronics compliance cluster with a product safety focus and has an implementation date of Nov 1, 2007.
Applicability depends on product scope, certification route, competent authority notices and transition rules. Requst for the translation or verify source before using this record in a compliance decision.
Compliance overview
Scope and applicability
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.
Technical requirements
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.
Testing methods
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.
FAQs
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.
Applicability hints
- Type
- Product
- CCS
- G61
- ICS
- 71.040.30
- Competent department
- Ministry of Industry and Information Technology
- Technical committee
- Ministry of Industry and Information Technology
Relationships
Replaces:GB 1259-1989