GB10737-2007
Working chemical - General rules for assay - Weight titration（potentiometric method）
工作基准试剂 含量测定通则 称量电位滴定法
GB 10737-2007 is a current mandatory Chinese national standard for Working chemical - General rules for assay - Weight titration（potentiometric method）. It appears in the Electronics compliance cluster with a testing methods 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
GB 10737-2007 specifies the general rules for the assay of working chemical reagents using the weight titration (potentiometric method). It is applicable to the high-precision content determination of chemical reference materials and working基准 reagents. This standard is mandatory for manufacturers and laboratories performing quality control on working chemical reagents in China.
Technical requirements
The standard outlines stringent requirements for chemical assay procedures. It mandates that the standard substances used for value transfer must have a content of not less than 99.95% and an expanded uncertainty of not greater than 0.02%. The weighing of standard substances and samples must be precise to 0.01mg, utilizing analytical balances with strict repeatability and maximum permissible error limits. Specific mass ranges for titrant consumption are mandated to ensure accuracy. Regarding precision, the standard requires that determinations be conducted by two operators, each performing four parallel tests. The relative value of the range for the eight parallel determinations must not exceed the critical repeatability range. The final reported result must be the average of these eight determinations, expressed to four significant figures. Additionally, the standard specifies that the expanded uncertainty of the assay result generally should not exceed 0.05%. It also details specific mathematical formulas for calculating the reagent content, incorporating buoyancy correction for the weighed masses under specific conditions.
Testing methods
The primary testing method involves a potentiometric titration apparatus equipped with indicating and reference electrodes, an ion meter with ±2mV precision, and specialized weighing titration bottles. The endpoint is determined using the second derivative method (detailed in Appendix C) by recording potential changes against the mass of the titrant. The procedure also includes mandatory air buoyancy correction for all weighed substances (Appendix D) and comprehensive calculation of measurement uncertainty (Appendix E).
FAQs
What products and reagents are regulated under GB 10737-2007?
This standard regulates the assay determination of working chemical reagents. It is specifically designed for high-precision content measurement using the weight titration (potentiometric method), achieving a relative standard deviation of 0.02%.
Are there any significant updates from the previous version of GB 10737?
The 2007 version revised the calculation formulas, adjusted precision requirements, and introduced new sections on general provisions and the calculation of expanded uncertainty. It also replaced the previous 1989 version.
How does GB 10737-2007 relate to international ISO standards?
The standard references GB/T 6682 for laboratory water specifications, which is neq ISO 3696:1987. However, GB 10737 itself is a specific Chinese national standard focusing on high-precision assay methods for working reagents, requiring strict adherence to its proprietary titration and uncertainty calculation procedures.
The summary above provides a high-level overview of GB 10737-2007. 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 10737-2007 today to access all detailed parameters, calculation formulas, and testing procedures.
Applicability hints
- Type
- Method
- CCS
- G60
- ICS
- 71.040.30
- Competent department
- Ministry of Industry and Information Technology
- Technical committee
- Ministry of Industry and Information Technology
Relationships
Replaces:GB 10737-1989