GB12596-2008

Working chemical - Calcium carbonate

工作基准试剂碳酸钙

GB 12596-2008 é uma norma nacional chinesa obrigatória vigente: Working chemical - Calcium carbonate. Setor: Eletrônicos. Foco: Segurança de produtos. Entrada em vigor: 1 de jun. de 2009.

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 applies to working chemical calcium carbonate used as a working基准 reagent in titration analysis. It is specifically designed for high-purity chemical reagents utilized in laboratory analytical processes. It is not applicable to industrial-grade or general-purpose calcium carbonate. The standard outlines the essential properties, specifications, and testing protocols for this specific analytical grade material.

Requisitos técnicos

The standard defines stringent specifications for calcium carbonate reagents, with mandatory clauses concerning its assay content and specific testing protocols. The primary chemical requirements include strict limits on the main content (CaCO3) to ensure a highly pure baseline for titration. Manufacturers must ensure the content falls within an extremely narrow mass fraction range to meet the working基准 grade. Additionally, the standard regulates physical and chemical parameters such as clarity, loss on drying, and alkalinity. It also sets strict maximum limits for various impurities, including chlorides, sulfates, total nitrogen, magnesium, iron, and heavy metals (as Pb). Compliance with these impurity thresholds is critical for preventing interference in analytical titrations.

Métodos de ensaio

The standard outlines various analytical testing methods to verify compliance. The primary content determination is performed using an EDTA titrimetric method, adhering to the general rules for weighing titration. Specific gravimetric and titrimetric procedures are mandated for assay verification. Impurity testing utilizes standard chemical analysis methods, including nephelometry and colorimetry for substances like chlorides, sulfates, and iron. Flame atomic absorption spectrometry is specified for determining magnesium content, following the general rules outlined in GB/T 9723. Furthermore, standard procedures for determining loss on drying and alkalinity are detailed to ensure physical and chemical stability.

Perguntas frequentes

What products are regulated under GB 12596-2008?

It applies to working chemical calcium carbonate used specifically for titration analysis in laboratories. It does not apply to industrial-grade or general-purpose calcium carbonate.

Are there any updates from the previous version of GB 12596-2008?

The updated version revised the determination method for content, changed the standard name, and removed the previous Appendix A regarding the preparation of reference solutions.

How does GB 12596-2008 differ from ISO standards?

The standard references several ISO standards, such as ISO 6353-1:1982 for impurity determination and ISO 3696:1987 for laboratory water, indicating a high degree of alignment with international chemical reagent specifications.

The summary above provides a high-level overview of GB 12596-2008. 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 12596-2008 today to access all detailed parameters, tables, and testing procedures.

Indicações de aplicabilidade

Tipo: Produto
CCS: G61
ICS: 71.040.30
Órgão competente: Ministry of Industry and Information Technology
Comitê técnico: Ministry of Industry and Information Technology

Relações

Substitui:GB 12596-1990