GB12593-2007
Working chemical - Ethylenediaminetetraacetic acid disodium salt
工作基准试剂 乙二胺四乙酸二钠
GB 12593-2007 is a current mandatory Chinese national standard for Working chemical - Ethylenediaminetetraacetic acid disodium salt. 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 specifically to working chemical reagents of ethylenediaminetetraacetic acid disodium salt (EDTA disodium salt) used for titration analysis. It is applicable to chemical manufacturers and laboratories producing or verifying high-purity benchmark reagents. It does not cover general industrial-grade or lower-purity chemical formulations.
Technical requirements
The standard outlines stringent specifications for the chemical properties of EDTA disodium salt. Chapters 4 and 5.3.1-5.3.2 are marked as mandatory, dictating the exact purity and content determination protocols. The primary chemical content must fall within an extremely tight tolerance range, specifically between 99.95% and 100.05%. Additionally, the standard sets strict threshold limits for various impurities, including chlorides, sulfates, and heavy metals (such as iron, copper, and lead). It also regulates the physical characteristics of the reagent, such as its pH value (ranging from 4.0 to 5.0 at 50 g/L) and clarity. Furthermore, a specific complexing power test and a limit for nitrilotriacetic acid are mandated to ensure the reagent's suitability for precise analytical titration.
Testing methods
Testing procedures involve highly precise analytical methods. Content determination is performed using a weighometric titration method with a standard zinc chloride solution, following the guidelines of GB 10738. Impurity testing for chlorides and sulfates utilizes visual nephelometry (turbidity comparison). The detection of nitrilotriacetic acid is conducted using polarography (pulse or oscilloscopic). Heavy metals and trace elements like iron and copper are measured via visual colorimetry, comparing sample solutions against standard color solutions. All testing must utilize laboratory water meeting grade three specifications as defined in GB/T 6682.
FAQs
What products are regulated under GB 12593-2007?
The standard applies to working chemical-grade EDTA disodium salt used specifically for titration analysis in laboratories. It does not apply to general industrial or lower-purity grades.
Are there any updates from the previous version of GB 12593?
Yes, GB 12593-2007 replaces the older GB 12593-1990. The primary update includes a modification to the content determination method (titration) and a slight change to the standard's naming convention.
How does GB 12593-2007 differ from ISO standards?
While it references some ISO-derived methodologies (such as GB/T 6682 for laboratory water), GB 12593-2007 is a highly specific Chinese national standard tailored for working chemical reagents, featuring stricter purity tolerances (99.95-100.05%) and specific localized testing protocols.
The summary above provides a high-level overview of GB 12593-2007. 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 12593-2007 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 12593-1990