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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 — действующий обязательный национальный стандарт Китая: pH primary reagent - Potassium hydrogen phthalate. Отрасль: Электроника. Тема: Безопасность продукции. Дата вступления в силу: 1 июн. 2009 г..
Применимость зависит от продукции, схемы сертификации, уведомлений компетентных органов и переходных правил. Закажите перевод или проверьте источник, прежде чем использовать эту запись в решениях по соответствию.
Обзор требований
Этот обзор пока доступен только на английском языке.
Область применения
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.
Технические требования
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.
Методы испытаний
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.
Частые вопросы
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.
Подсказки по применимости
- Тип
- Продукция
- CCS
- G61
- ICS
- 71.040.30
- Компетентное ведомство
- Ministry of Industry and Information Technology
- Технический комитет
- Ministry of Industry and Information Technology
Связи
Заменяет:GB 6857-1986