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
