GB1256-2008

Working chemical - Arsenic trioxide

工作基准试剂三氧化二砷

GB 1256-2008 é uma norma nacional chinesa obrigatória vigente: Working chemical - Arsenic trioxide. 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 is applicable to working chemical reagents, specifically arsenic trioxide (As2O3), used for titration analysis. It is mandatory for manufacturers producing benchmark reagents for analytical chemistry in China. The standard defines the properties, specifications, testing methods, and packaging requirements for this highly toxic chemical.

Requisitos técnicos

The standard specifies stringent physical and chemical requirements for arsenic trioxide. Chapter 4 and specific clauses regarding content determination are marked as mandatory. The core specifications cover the mass fraction of As2O3, which must fall within an extremely narrow tolerance band to qualify as a working benchmark. Additionally, the standard sets strict maximum limits for various impurities, including chlorides, sulfides, iron, copper, antimony, and lead. The reagent must also pass a clarity test and meet limits for ignition residue. Due to its nature as a highly toxic substance, specific packaging and labeling requirements, including prominent poison warnings, are also mandated.

Métodos de ensaio

Testing procedures involve gravimetric titration using an iodine standard titration solution to determine the exact As2O3 content. Impurity testing relies on visual colorimetry and turbidimetry for elements like sulfides, iron, and antimony. For trace metals such as copper and lead, the standard mandates anodic stripping voltammetry as outlined in GB/T 3914-2008. Strict sample preparation protocols, including drying in a sulfuric acid desiccator, are required prior to testing.

Perguntas frequentes

What products are regulated under GB 1256-2008?

The standard applies to arsenic trioxide used specifically as a working chemical reagent for titration analysis. It is not intended for general industrial or commercial grade arsenic trioxide.

Are there any updates from the previous version of GB 1256-2008?

Compared to its predecessor GB 1256-1990, the 2008 version modified the standard's title and updated the determination method for the As2O3 content. Specific clauses regarding specifications and content determination are mandatory.

How does GB 1256-2008 relate to international ISO standards?

The standard references several methodologies that are modified or non-equivalent to ISO standards, such as GB/T 6682 (water specifications) and GB/T 9729 (chloride determination). However, GB 1256-2008 itself is a specific Chinese national standard tailored for domestic working reagent compliance.

The summary above provides a high-level overview of GB 1256-2008. 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 1256-2008 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 1256-1990