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GB6857-2008
pH primary reagent - Potassium hydrogen phthalate
pH 基准试剂 邻苯二甲酸氢钾
GB 6857-2008 es una norma nacional china obligatoria vigente: pH primary reagent - Potassium hydrogen phthalate. Sector: Electrónica. Enfoque: Seguridad de productos. Entrada en vigor: 1 jun 2009.
La aplicabilidad depende del alcance del producto, la vía de certificación, los avisos de la autoridad competente y las reglas de transición. Solicite una traducción o verifique la fuente antes de usar esta ficha en una decisión de cumplimiento.
Resumen de cumplimiento
Este resumen está disponible por ahora solo en inglés.
Alcance y aplicabilidad
This standard specifies the properties, specifications, testing methods, inspection rules, and packaging for pH primary reagent - Potassium hydrogen phthalate. It is applicable to the inspection and quality control of this specific chemical reagent used as a pH benchmark. Compliance with this standard is mandatory for manufacturers producing pH primary reagents in China. The standard replaces the previous GB 6857-1986.
Requisitos técnicos
The standard outlines the mandatory specifications for potassium hydrogen phthalate, focusing on its purity and physical-chemical properties. Chapter 4 and Section 5.3 are designated as mandatory requirements, while other clauses are recommended. Key parameters regulated include the pH(S)II value of the solution, the main content (purity) percentage, and limits for various impurities such as chlorides, sulfates, and heavy metals. Manufacturers must ensure their product meets these strict purity tiers to be certified as a pH primary reagent. The standard also defines acceptable limits for clarity, loss on drying, and water-insoluble matter, referencing general chemical reagent testing guidelines like GB/T 601 and GB/T 602.
Métodos de ensayo
Testing procedures are detailed to verify compliance with the specified limits. The pH(S)II value is determined using a palladium hydrogen electrode according to GB 6851. Purity (content) is measured following the methods in GB 1257-2007. Impurity testing includes flame atomic absorption spectrometry for sodium, and colorimetric or turbidimetric methods for heavy metals, iron, and ammonium. Specific safety and health measures must be taken during testing due to the toxic or corrosive nature of some reagents used. Sampling and acceptance rules follow HG/T 3921.
Preguntas frecuentes
What products are regulated under GB 6857-2008?
It applies to pH primary reagent - Potassium hydrogen phthalate, a high-purity chemical reagent used for pH measurement calibration.
What are the mandatory requirements in GB 6857-2008?
Chapter 4 (Specifications) and Section 5.3 (Determination of pH(S)II value) are mandatory. All other provisions are recommended.
How does GB 6857-2008 differ from the previous version?
It replaces GB 6857-1986, updating the standard name, adjusting the tolerance for the pH(S)II value, and modifying the determination methods for content, chlorides, and iron.
The summary above provides a high-level overview of GB 6857-2008. To ensure complete compliance for your chemical reagents entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 6857-2008 today to access all detailed parameters, tables, and testing procedures.
Indicaciones de aplicabilidad
- Tipo
- Producto
- CCS
- G61
- ICS
- 71.040.30
- Organismo competente
- Ministry of Industry and Information Technology
- Comité técnico
- Ministry of Industry and Information Technology
Relaciones
Sustituye a:GB 6857-1986