标准编号:	GB/T 16496-1996
中文名称:	化学试剂 硫酸钾
英文名称:	Chemical reagent-Potassium sulfate
行业分类:	GB    国家标准
发布机构:	国家质量技术监督局
发布日期:	1996-8-22
实施日期:	1997-2-1
标准状态:	valid
翻译语言:	英文
文件格式:	PDF
中文字符数:	7000 字
翻译价格(元):	540.0
交付时间:	付款后 1 个工作日

Contents Foreword i 1 Scope 1 2 Normative references 1 3 Properties 2 4 Specifications 2 5 Test 2 6 Inspection rules 6 7 Packaging and marking 6 Annex A (Normative) Treatment and regeneration methods of strong acidic cation exchange resins 7 Foreword Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This standard gives two grades of analytically pure and chemically pure, in which the analytically pure is identical to the R 85 "potassium sulfate" in international standard ISO 6353-3: 1987 Reagents for chemical analysis - Part 3: Specifications - Second series. The differences are as follows: 1 Standard compilation According to China's national conditions, this standard has added three clauses: properties, inspection rules and packaging and marking. 2 Specifications 2.1 Items Compared with international standards, this standard has added clarity test and water insoluble matter. 2.2 Indexes The requirements for analytically pure iron and arsenic are stricter than international standards, and other items are identical to international standards. 3 Test For the determination method of content, this standard is identical to the international standard. For the determination of calcium, the international standard uses atomic absorption spectrography, while this standard uses calcium reagent colorimetry which is convenient to implement. Other items all refer to the corresponding standards in a set of standards related to the general test methods for chemical reagents formulated in China. This set of standards is basically developed by reference to the international standard ISO 6353-1: 1982 Reagents for chemical analysis - Part 1: General test methods. This standard is based on HG 3-920-76 Chemical reagent - Potassium sulfate. Compared with the previous edition, in order to adopt the international standard, the specifications and test methods are modified accordingly. The professional standard HG 3-920-76 of the former Ministry of Chemical Industry shall be abolished from the effective date of this standard. Annex A in this standard is normative. This standard was proposed by the Ministry of Chemical Industry of the People’s Republic of China. This standard is under the jurisdiction of Beijing Chemical Reagent General Factory. Chemical reagent - Potassium sulfate Molecular formula: K2SO4 Relative molecular mass: 174.26 1 Scope This standard specifies the technical requirements, test methods, inspection rules as well as packaging and marking of the chemical reagent potassium sulfate. 2 Normative references The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. At the time of publication, all editions listed are valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. GB/T 601-88 Chemical reagent - Preparations of standard volumetric solutions GB/T 602-88 Chemical reagent - Preparations of stock standard solutions GB/T 603-88 Chemical reagent - Preparations of reagent solutions for use in test methods GB/T 609-88 Chemical reagent - General method for the determination of total nitrogen (idt ISO 6353-1: 1982) GB/T 610.2-88 Chemical reagent - General method for the determination of arsenic (AgDDTC) (eqv ISO 6353: 1982) GB/T 619-88 Chemical reagent - Regulations for sampling and acceptance GB 6682-92 Water for analytical laboratory use - Specification and test methods (eqv ISO 3696: 1987) GB/T 9723-88 Chemical reagent - General rules for flame atomic absorption spectrometry GB/T 9724-88 Chemical reagent - General rules for the determination of pH (eqv ISO 6353-1: 1982) GB/T 9729-88 Chemical reagent - General method for the determination of chloride (eqv ISO 6353-1: 1982) GB/T 9735-88 Chemical reagent - General method for the determination of heavy metals (eqv ISO 6353-1: 1982) GB/T 9738-88 Chemical reagent - General method for the determination of water insoluble matter (eqv ISO 6353-1: 1982) GB/T 9739-88 Chemical reagent - General method for the determination of iron (eqv ISO 6353-1: 1982) GB 15346-94 Chemical reagent - Packaging and marking HG 3-1168-78 Preparation and determination method of chemical reagent clarity standard 3 Properties This reagent is colorless and transparent crystal or powder, soluble in water. 4 Specifications The specifications of potassium sulfate shall meet those specified in Table 1. Table 1 Name Analytically pure Chemically pure Content (K2SO4), % ≥99.0 ≥98.5 pH (50g/L, 25°C) 5.0–8.0 5.0–8.0 Clarity test Acceptable Acceptable Water insoluble mater, % ≤0.005 ≤0.01 Chloride (Cl), % ≤0.0005 ≤0.001 Total nitrogen (N), % ≤0.0005 ≤0.001 Sodium (Na), % ≤0.03 ≤0.1 Calcium (Ca), % ≤0.01 ≤0.02 Iron (Fe), % ≤0.0002 ≤0.0005 Arsenic (As), % ≤0.0001 ≤0.0005 Heavy metal (by Pb), % ≤0.0005 ≤0.001

Foreword i 1 Scope 2 Normative references 3 Properties 4 Specifications 5 Test 6 Inspection rules 7 Packaging and marking Annex A (Normative) Treatment and regeneration methods of strong acidic cation exchange resins

中华人民共和国国家标准 GB/T 16496—1996 化学试剂 硫酸钾 Chemical reagent Potassium sulfate 国家技术监督局1996-08-22批准 1997-02-01实施 前言 本标准给出分析纯、化学纯两个级别，其中分析纯等效采用国际标准化组织ISO 6353-3：1987《化学分析试剂——第3部分：规格——第二批》中R 85“硫酸钾”。差异如下： 1 标准编写 根据我国国情，本标准增列了性状、检验规则和包装及标志三章。 2 规格 2.1 项目 本标准比国际标准多列澄清度试验和水不溶物两项。 2.2 指标 分析纯的铁和砷两项严于国际标准，其他各项与国际标准相同。 3 试验 本标准含量的测定方法与国际标准相同，钙的测定，国际标准用原子吸收光谱法，本标准采用便于实施的钙试剂比色法。其他项目均引用我国已制定的一套化学试剂通用试验方法标准中相应的标准。这套标准基本上是采用ISO 6353-1：1982《化学分析试剂——第1部分：通用试验方法》制定的。 本标准是在HG 3—920—76《化学试剂 硫酸钾》的基础上制定的，与前版本相比，为采用国际标准，在规格及试验方法上作了相应的变动。 本标准从生效之日起，原化学工业部行业标准HG 3—920—76作废。 本标准的附录A是标准的附录。 本标准由中华人民共和国化学工业部提出。 本标准由北京化学试剂总厂归口。 化学试剂 硫酸钾 分子式：K2SO4 相对分子质量：174.26 1 范围 本标准规定了化学试剂硫酸钾的技术要求、试验方法、检验规则和包装及标志。 2 引用标准 下列标准所包含的条文，通过在本标准中引用而构成为本标准的条文。本标准出版时，所示版本均为有效。所有标准都会被修订，使用本标准的各方应探讨使用下列标准最新版本的可能性。 GB/T 601—88 化学试剂 滴定分析(容量分析)用标准溶液的制备 GB/T 602—88 化学试剂 杂质测定用标准溶液的制备 GB/T 603—88 化学试剂 试验方法中所用制剂及制品的制备 GB/T 609—88 化学试剂 总氮量测定通用方法(idt ISO 6353-1：1982) GB/T 610.2—88 化学试剂 砷测定通用方法(二乙基二硫代氨基甲酸银法)(eqv ISO 6353：1982) GB/T 619—88 化学试剂 采样及验收规则 GB 6682—92 分析实验室用水规格和试验方法(eqv ISO 3696：1987) GB/T 9723—88 化学试剂 火焰原子吸收光谱法通则 GB/T 9724—88 化学试剂 pH值测定通则(eqv ISO 6353-1：1982) GB/T 9729—88 化学试剂 氯化物测定通用方法(eqv ISO 6353-1：1982) GB/T 9735—88 化学试剂 重金属测定通用方法(eqv ISO 6353-1：1982) GB/T 9738—88 化学试剂 水不溶物测定通用方法(eqv ISO 6353-1：1982) GB/T 9739—88 化学试剂 铁测定通用方法(eqv ISO 6353-1：1982) GB 15346—94 化学试剂 包装及标志 HG 3—1168—78 化学试剂 澄清度标准的制备及测定方法 3 性状 本试剂为无色透明结晶或粉末，溶于水。 4 规格 硫酸钾的规格应符合表1的规定 表1 名称 分析纯 化学纯 含量(K2SO4)，％ ≥99.0 ≥98.5 pH(50g/L，25℃) 5.0～8.0 5.0～8.0 澄清度试验 合格 合格 水不溶物，％ ≤0.005 ≤0.01 氯化物(Cl)，％ ≤O.0005 ≤0.001 总氮量(N)，％ ≤0.0005 ≤0.001 钠(Na)，％ ≤0.03 ≤0.1 钙(Ca)，％ ≤0.01 ≤0.02 铁(Fe)，％ ≤0.0002 ≤O.0005 砷(As)，％ ≤0.0001 ≤0.0005 重金属(以Pb计)，％ ≤0.0005 ≤0.001 5 试验 本章中除另有规定外，所用标准滴定溶液、标准溶液、制剂及制品，均按GB/T 601、GB/T 602、GB/T 603的规定制备，实验用水应符合GB 6682—92中三级水规格，样品均按精确至0.01g称量。 5.1 含量 称取0.3g样品，精确至0.0001g。溶于30mL水中，注入强酸性阳离子交换树脂柱中，树脂的处理及再生方法见附录A(标准的附录)，以约5mL/min的流量进行交换，交换液收集于锥形瓶中，用水分次洗涤树脂至滴下溶液呈中性。收集交换液和洗涤液，加2滴酚酞指示液(10g/L)，用氢氧化钠标准滴定溶液[c(NaOH)＝0.1mol/L]滴定至溶液呈粉红色，并保持30s。同时做空白试验。 含量按下式计算： 式中：X——硫酸钾的质量百分含量，％； V1——氢氧化钠标准滴定溶液的体积，mL； V2——空白试验氢氧化钠标准滴定溶液的体积，mL； c——氢氧化钠标准滴定溶液的浓度，mol/L； 87.13——硫酸钾的摩尔质量[M(1/2K2SO4)]，g/mol； m——样品的质量，g。 5.2 pH 按GH/T 9724的规定测定。