GB/T 26523-2011 English PDF (GBT26523-2011)

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GB/T 26523-2011: Refined cobaltous sulfates
GB/T 26523-2011
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.060.50
G 12
Refined cobaltous sulfates
精制硫酸钴
ISSUED ON: MAY 12, 2011
IMPLEMENTED ON: DECEMBER 01, 2011
Issued by: General Administration of Quality Supervision, Inspection
and Quarantine;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Molecular formula and relative molecular mass ... 5 
4 Requirements ... 5 
5 Test method ... 5 
6 Inspection rules ... 24 
7 Marking, labeling ... 25 
8 Packaging, transportation, storage ... 25 
Appendix A (Informative) Method for processing mercury waste liquid ... 26 
Refined cobaltous sulfates
1 Scope
This Standard specifies the requirements, test methods, inspection rules,
marking, labeling, packaging, transportation and storage of refined cobaltous
sulfates.
This Standard applies to refined cobaltous sulfates that are mainly used in
industries such as chemical industry, electroplating industry, battery industry,
chemical reagents.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For
undated references, the latest edition (including all amendments) applies to this
document.
GB/T 191-2008, Packaging - Pictorial marking for handling of goods
GB/T 3049-2006, Chemical products for industrial use - General method for
determination of iron content - 1,10-Phenanthroline spectrophotometric
method
GB/T 6678, General principles for sampling chemical products
GB/T 6682-2008, Water for analytical laboratory use - Specification and test
methods
GB/T 8170, Rules of rounding off for numerical values and expression and
judgment of limiting values
GB/T 9724-2007, Chemical reagent - General rule for the determination of
pH
GB/T 16488-1996, Water quality - Determination of petroleum oil, animal and
vegetable oils - Infrared photometric method
HG/T 3696.1, Inorganic chemical products - Preparations of standard
volumetric solutions for chemical analysis
HG/T 3696.2, Inorganic chemical products - Preparations of standard
solutions for chemical analysis
immediately with water. In severe cases, treat immediately. When
flammable products are used, it is strictly forbidden to use an open flame
for heating.
5.2 General provisions
The reagents and water that are used in this Standard, when no other
requirements are specified, refer to analytical reagents and grade-III water
which is specified in GB/T 6682-2008. All the reagents and water that are used
in the atomic absorption method in the Standard refer to the guaranteed
reagents and the grade-II water that is specified in GB/T 6682-2008. The
standard titration solutions, impurity standard solutions, preparations and
products that are used in the test shall be prepared in accordance with the
provisions of HG/T 3696.1, HG/T 3696.2, HG/T 3696.3 when no other
requirements are specified.
5.3 Appearance inspection
Under natural light, visually judge the appearance.
5.4 Determination of cobalt content
5.4.1 Method summary
In an acid solution, add hydroxylamine hydrochloride to the test solution to
reduce the iron; cobalt and thiocyanate form cobalt thiocyanate [Co(SCN)4]2-
blue complex; in the presence of acetone, use Ethylene Diamine Tetraacetic
Acid (EDTA) standard titration solution and cobalt to form a complex; when it
reaches the end point, the blue color disappears.
5.4.2 Reagents
5.4.2.1 Hydroxylamine hydrochloride.
5.4.2.2 Ammonium thiocyanate.
5.4.2.3 Acetone.
5.4.2.4 Saturated ammonium acetate solution.
5.4.2.5 Ethylene Diamine Tetraacetic Acid standard titration solution: c(EDTA)
≈ 0.05 mol/L.
5.4.3 Analysis steps
Weigh about 0.35 g ~ 0.40 g of sample, accurate to 0.000 2 g; put in 250 mL
conical flask; add 50 mL of water, 0.25 g of hydroxylamine hydrochloride; add
10 g of ammonium thiocyanate; add 4 mL of saturated ammonium acetate
5.5.2.3 Zinc standard solution: 1 mL of solution contains 0.01 mg of zinc (Zn).
Pipette 1 mL of the zinc standard solution that is prepared according to HG/T
3696.2; place it in a 100 mL volumetric flask; use water to dilute to the mark;
shake well.
5.5.2.4 Iron standard solution: 1 mL of solution contains 0.1 mg of iron (Fe).
Pipette 10 mL of the iron standard solution that is prepared according to HG/T
3696.2; place it in a 100 mL volumetric flask; use water to dilute to the mark;
shake well.
5.5.2.5 Copper standard solution: 1 mL of solution contains 0.1 mg of copper
(Cu).
Pipette 10 mL of the copper standard solution that is prepared according to
HG/T 3696.2; place it in a 100 mL volumetric flask; use water to dilute to the
mark; shake well.
5.5.2.6 Lead standard solution: 1 mL of solution contains 0.1 mg of lead (Pb).
Pipette 10 mL of the lead standard solution that is prepared according to HG/T
3696.2; place it in a 100 mL volumetric flask; use water to dilute to the mark;
shake well.
5.5.2.7 Cadmium standard solution: 1 mL of solution contains 0.01 mg of
cadmium (Cd).
Pipette 1 mL of the cadmium standard solution that is prepared according to
HG/T 3696.2; place it in a 100 mL volumetric flask; use water to dilute to the
mark; shake well.
5.5.2.8 Manganese standard solution: 1 mL of solution contains 0.1 mg of
manganese (Mn).
Pipette 10 mL of the manganese standard solution that is prepared according
to HG/T 3696.2; place it in a 100 mL volumetric flask; use water to dilute to the
mark; shake well.
5.5.2.9 Acetylene: high purity.
5.5.3 Instruments and apparatuses
Atomic absorption spectrophotometer: it is equipped with nickel hollow cathode
lamp, zinc hollow cathode lamp, iron hollow cathode lamp, copper hollow
cathode lamp, lead hollow cathode lamp, cadmium hollow cathode lamp and
manganese hollow cathode lamp.
In sulfuric acid solution, use potassium permanganate to oxidize chromium to
hexavalent; hexavalent chromium forms a purple complex with
diphenylcarbazide in sulfur-phosphorus mixed acid solution; after using isoamyl
alcohol for extraction, at a wavelength of 545 nm, use a spectrophotometer to
measure its absorbance.
5.8.2 Reagents
5.8.2.1 Sodium nitrite solution.
5.8.2.2 Sulfuric acid solution: 1+2.
5.8.2.3 Phosphoric acid solution: 1+2.
5.8.2.4 Urea solution: 200 g/L.
5.8.2.5 Potassium permanganate solution: 40 g/L.
5.8.2.6 Diphenylcarbazide solution: 1 g/L.
Weigh 0.1 g of diphenylcarbazide in 100 mL of acetone that contains 1 mL of
sulfuric acid solution (1+9); store in a brown bottle.
5.8.2.7 Isoamyl alcohol.
5.8.2.8 Chromium standard solution: 1 mL of solution contains 0.005 mg of
chromium (Cr).
Preparation: pipette 1 mL of the chromium standard solution that is prepared
according to HG/T 3696.2; place it in a 100 mL volumetric flask; use water to
dilute to the mark; shake well. Weigh 50 mL in a 100 mL volumetric flask; use
water to dilute to the mark; shake well. Formulate this solution when needed.
5.8.3 Instruments
5.8.3.1 Conical separating funnel: 125 mL.
5.8.3.2 Spectrophotometer: it is equipped with a 1 cm absorption cell.
5.8.4 Analysis steps
5.8.4.1 Preparation of test solution A
Weigh about 2 g of the superior product and about 0.5 g of the first-class product,
accurate to 0.001 g; put them in a 250 mL beak...