GB1254-2007
Working chemical - Sodium oxalate
工作基准试剂 草酸钠
GB 1254-2007 is a current mandatory Chinese national standard for Working chemical - Sodium oxalate. It appears in the Electronics compliance cluster with a product safety focus and has an implementation date of Apr 1, 2008.
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 to working chemical reagents, specifically sodium oxalate, utilized as a titration standard in analytical chemistry. It is applicable to manufacturers and laboratories producing or verifying working-grade sodium oxalate for volumetric analysis. It does not apply to general industrial or technical-grade sodium oxalate.
Technical requirements
The standard specifies stringent physical and chemical requirements for sodium oxalate. It defines the mandatory specifications for the reagent's purity, including a highly restricted mass fraction content range, specific pH value parameters, and strict limits on drying loss. Compliance with these primary chemical parameters is mandatory for all working基准 (benchmark) reagents. Additionally, the standard regulates the maximum allowable limits for various trace impurities to ensure analytical accuracy. This includes strict thresholds for chlorides, sulfur compounds, total nitrogen, and heavy metals (as Pb). It also sets requirements for clarity and the absence of readily carbonizable substances. Manufacturers must ensure their product meets all these impurity thresholds to achieve certification.
Testing methods
The standard outlines rigorous testing procedures to verify compliance. The primary assay (content) is determined via a gravimetric titration method using a potassium permanganate standard titration solution, adhering to the GB 10738 general rules. Accurate mass measurement and specific temperature controls during titration are critical for this method. Other evaluations include pH measurement following GB/T 9724, clarity testing against standard turbidity solutions, and drying loss determination at elevated temperatures. Trace impurities such as potassium are measured using flame atomic absorption spectrometry, while heavy metals and sulfates are evaluated via visual colorimetric and turbidimetric comparisons against standard reference solutions.
FAQs
What products are regulated under GB 1254-2007?
It applies to working chemical sodium oxalate used as a titration standard in analytical laboratories. It is not intended for general industrial-grade sodium oxalate.
Are there any updates from the previous version of GB 1254-2007?
The standard was renamed to 'Working chemical - Sodium oxalate' and the method for determining the content (assay) was modified to align with the updated GB 10738 standard.
How does GB 1254-2007 differ from standard ISO chemical reagent standards?
It sets highly stringent purity tolerances (99.95%-100.05%) and specific limits for trace impurities such as chlorides, sulfates, and heavy metals, which are critical for accurate volumetric analysis.
The summary above provides a high-level overview of GB 1254-2007. 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 1254-2007 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 1254-1990