GB12595-2008
Working chemical - Silver nitrate
工作基准试剂 硝酸银
GB 12595-2008 is a current mandatory Chinese national standard for Working chemical - Silver nitrate. It appears in the Electronics compliance cluster with a product safety focus and has an implementation date of Jun 1, 2009.
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 silver nitrate (AgNO3), intended for use in titration analysis. It is applicable to chemical reagents used as working reference materials in analytical laboratories. It does not apply to general industrial or photographic grade silver nitrate.
Technical requirements
The standard specifies stringent physical and chemical requirements for silver nitrate. Chapter 4 and clauses 5.2.1 and 5.2.2 are mandatory, while other provisions are recommended. The core specifications include strict purity limits for the AgNO3 content, which must fall within an extremely narrow tolerance range. Additionally, the standard defines parameters for appearance, mandating that the reagent be colorless or white crystals without dark discoloration. Furthermore, the standard sets maximum allowable thresholds for various impurities to ensure analytical accuracy. Key chemical parameters include pH value, clarity, and drying loss. Manufacturers must strictly control trace impurities including chlorides, sulfates, iron, copper, and lead. The standard also specifies limits for hydrochloric acid insoluble substances to guarantee the reagent's overall quality as a working reference material.
Testing methods
The standard outlines specific testing methodologies to verify compliance. The primary assay determination for silver nitrate content is conducted using a gravimetric potentiometric titration method, utilizing a sodium chloride reference solution and specific silver/mercury electrodes. pH measurement is performed according to referenced general rules, while clarity is assessed against standard turbidity solutions. Trace impurities such as iron, copper, and lead are quantified using flame atomic absorption spectrometry (FAAS). Other impurities like chlorides and sulfates are determined via visual turbidity comparison methods. All testing must be conducted using high-precision analytical balances and specified reference water grades.
FAQs
What products are regulated under GB 12595-2008?
It applies to silver nitrate used as a working chemical reagent specifically for titration analysis. It does not apply to general industrial or photographic grade silver nitrate.
Are there any updates from the previous version of GB 12595?
The standard renamed the item to Working chemical-Silver nitrate, changed the determination methods for content, iron, copper, and lead, replaced the "water solution reaction" parameter with pH value, and removed the previous appendix on reference solution preparation.
How does GB 12595-2008 differ from ISO standards?
The standard references several GB/T methodologies that are modified or equivalent to ISO standards (e.g., ISO 6353-1, ISO 3696). However, GB 12595 establishes specific mandatory limits and testing procedures tailored for Chinese working基准 (working reference) reagents.
The summary above provides a high-level overview of GB 12595-2008. 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 12595-2008 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 12595-1990