GB10738-2007

Working chemical - General rules for assay - weight titration

工作基准试剂含量测定通则称量滴定法

GB 10738-2007 é uma norma nacional chinesa obrigatória vigente: Working chemical - General rules for assay - weight titration. Setor: Eletrônicos. Foco: Métodos de ensaio. Entrada em vigor: 1 de nov. de 2007.

A aplicabilidade depende do escopo do produto, da via de certificação, dos avisos da autoridade competente e das regras de transição. Solicite uma tradução ou verifique a fonte antes de usar este registro em uma decisão de conformidade.

Visão geral de conformidade

Esta visão geral está disponível por enquanto apenas em inglês.

Escopo e aplicabilidade

This standard specifies the general rules for the assay of working chemical reagents using the weight titration method. It is applicable to the high-precision content determination of working基准试剂 (working reference reagents) where the relative standard deviation of the measurement result is 0.02%. This standard is mandatory for manufacturers and laboratories performing content assays on working chemical reagents in China. It is not applicable to general industrial titrations that do not require metrological traceability via certified reference materials.

Requisitos técnicos

The standard outlines stringent general provisions for the assay process. It mandates that the standard materials used for value transfer must have a content (mass fraction) of not less than 99.95% and an expanded uncertainty of not greater than 0.02%. The weighing of standard materials and samples must be precise to 0.01mg, utilizing analytical balances with strict maximum permissible error limits. Two analysts must independently perform four parallel experiments each, with strict repeatability critical limits applied to the eight combined parallel results. The standard details the calculation formulas for determining the mass fraction of the working chemical reagent, accounting for both operating solution and reference solution value transfer methods. It requires buoyancy correction for weighed masses under specific conditions. Furthermore, it mandates the evaluation and reporting of the expanded uncertainty of the assay results, which generally should not exceed 0.05%. Specific apparatus requirements are defined, including the specifications for the weighing titration bottle and the reaction bottle. The standard also includes normative appendices detailing the preparation of reference solutions and the complex mathematical procedures for calculating Type A and Type B standard uncertainty components.

Métodos de ensaio

The primary testing method is weight titration, which involves using an analytical balance to measure the mass of the titrant consumed rather than the volume. The procedure requires simultaneous pretreatment of the sample and standard material, followed by alternating weighing and titration to ensure metrological traceability. The endpoint is determined using specified indicators. Additionally, the standard outlines comprehensive mathematical evaluation procedures for calculating the expanded uncertainty of the assay, incorporating both A-type and B-type uncertainty components.

Perguntas frequentes

What products and processes are regulated under GB 10738-2007?

GB 10738-2007 applies specifically to the assay (content determination) of working chemical reagents using the weight titration method. It is intended for high-precision chemical analysis rather than general industrial manufacturing.

Are there any significant updates from the previous GB 10738-1989 version?

The 2007 version updated the standard's name, adjusted the method's precision requirements, modified the calculation formulas, and introduced new sections for calculating the expanded uncertainty of measurement results.

How does GB 10738-2007 relate to international ISO standards?

While it references GB/T 6682 (which is modified from ISO 3696 for laboratory water), GB 10738-2007 is a specific Chinese national standard detailing a unique weight titration methodology and mandatory uncertainty evaluation framework tailored for domestic working reagent standards.

The summary above provides a high-level overview of GB 10738-2007. 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 10738-2007 today to access all detailed parameters, calculation formulas, uncertainty evaluation procedures, and apparatus diagrams.

Indicações de aplicabilidade

Tipo: Método
CCS: G60
ICS: 71.040.30
Órgão competente: Ministry of Industry and Information Technology
Comitê técnico: Ministry of Industry and Information Technology

Relações

Substitui:GB 10738-1989