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GB 31060-2014: [GB/T 31060-2014] Water treatment chemicals -- Aluminum sulfate
GB 31060-2014
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.80
G 77
Water treatment chemicals - Aluminum sulfate
水处理剂 硫酸铝
ISSUED ON: DECEMBER 22, 2014
IMPLEMENTED ON: OCTOBER 01, 2015
Issued by: State Administration for Market Regulation;
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 molecular weight ... 5
4 Product classification ... 5
5 Requirements ... 5
6 Test methods ... 6
7 Inspection rules ... 27
8 Marks, labels and packaging ... 28
Water treatment chemicals - Aluminum sulfate
WARNING -- The strong acids and bases used in this Standard are corrosive. It
shall avoid inhalation or contact with the skin during use. If splashed on the body,
rinse immediately with plenty of water. In severe cases, seek medical attention
immediately.
1 Scope
This Standard specifies the requirements, classification, test methods, inspection rules,
marks, labels and packaging of aluminum sulfate.
This Standard applies to aluminum sulfate used as a water treatment agent. The product
is mainly used for drinking water and industrial water, waste water and sewage
treatment. Among them, the raw sulfuric acid used for drinking water shall be industrial
sulfuric acid; aluminum-containing raw materials shall be industrial aluminum
hydroxide.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 191, Packaging and storage marks
GB/T 601, Chemical reagent -- Preparations of standard volumetric solutions
GB/T 602, Chemical reagent -- Preparations of standard solutions for impurity
GB/T 603, Chemical reagent -- Preparations of reagent solutions for use in test
methods
GB/T 610-2008, Chemical reagent -- General method for the determination of
arsenic
GB/T 6678, General principles for sampling chemical products
GB/T 6680, General rules for sampling liquid chemical products
GB/T 6682, Water for analytical laboratory use -- Specification and test methods
GB/T 8170, Rules of rounding off for numerical values and expression and
6 Test methods
6.1 General
Reagents used in this Standard, unless otherwise specified, only use analytically pure
reagents.
The standard solutions, impurity standard solutions, preparations and products required
in the test shall be prepared according to the provisions of GB/T 601, GB/T 602 and
GB/T 603 unless other requirements are specified.
6.2 Determination of alumina content
6.2.1 Method summary
The aluminum in the specimen reacts with a known excess of disodium edetate solution
to form a complex. When the pH value is about 6, xylenol orange is used as the indicator.
Use zinc chloride standard titration solution to titrate excess disodium edetate solution.
6.2.2 Reagents and materials
6.2.2.1 Water: meet the grade three water specification in GB/T 6682.
6.2.2.2 Hydrochloric acid solution: 1+1.
6.2.2.3 Sodium acetate solution: 272 g/L.
6.2.2.4 Zinc chloride standard stock solution: c(ZnCl2) = 0.1 mol/L.
6.2.2.5 Zinc chloride standard titration solution: c(ZnCl2) = 0.025 mol/L. Prepare
according to GB/T 601 and dilute 4 times.
6.2.2.6 Disodium ethylenediaminetetraacetic acid (EDTA) standard solution: c(EDTA)
= 0.05 mol/L.
6.2.2.7 Xylenol orange indicator solution: 2 g/L.
6.2.3 Analysis steps
6.2.3.1 Preparation of test solution
Weigh about 5 g of solid specimen or 10 g of liquid specimen, accurate to 0.2 mg. Place
in a 250 mL beaker. Add 100 mL of water and 2 mL of hydrochloric acid solution. Heat
to dissolve and boil for 5 min (filter if necessary). After cooling, transfer all to a 500
mL volumetric flask. Use water to dilute to the scale. Shake well. This solution shall be
the test solution A, for the determination of alumina and iron content.
6.2.3.2 Preparation of blank test solution
Weigh (1.00±0.01)g of specimen. Place it in a 100 mL beaker. Add about 50 mL of
carbon dioxide-free water to dissolve. Transfer all to a 100 mL volumetric flask. Use
carbon dioxide-free water to dilute to the scale. Shake well. Pour the specimen solution
into the beaker. Measure its pH value on a pH meter that has been positioned.
6.6 Determination of arsenic content
6.6.1 Atomic fluorescence spectroscopy
6.6.1.1 Method principle
After the specimen is treated with acid, add thiourea to pre-reduce pentavalent arsenic
to trivalent arsenic. Then add sodium borohydride or potassium borohydride to reduce
and generate arsine, which is decomposed into atomic arsenic by loading argon gas into
a quartz atomizer. Atomic fluorescence is excited by the emitted light from an arsenic
hollow cathode lamp. Its fluorescence intensity is directly proportional to the
concentration of arsenic in the tested solution under fixed conditions. Conduct
quantitative comparison with standard series.
6.6.1.2 Reagents and materials
6.6.1.2.1 Water: meet the grade two water specification in GB/T 6682.
6.6.1.2.2 Hydrochloric acid: guaranteed reagent.
6.6.1.2.3 Nitric acid: guaranteed reagent.
6.6.1.2.4 Thiourea solution: 100 g/L.
6.6.1.2.5 Hydrochloric acid solution: 1+49.
6.6.1.2.6 Nitric acid solution: 1+1.
6.6.1.2.7 Potassium borohydride-sodium hydroxide solution: Weigh 2.0 g of sodium
hydroxide and 10.0 g of potassium borohydride into a polyethylene beaker. Dissolve
with water and dilute to 1000 mL. Store in polyethylene bottles.
6.6.1.2.8 Arsenic standard stock solution: 0.1 mg/mL.
6.6.1.2.9 Arsenic standard solution: pipette 10.00 mL of arsenic standard stock solution
into a 100 mL volumetric flask. Use water to dilute to the scale. Mix well. Just before
use, pipette 10.00 mL of this solution into a 100 mL volumetric flask. Use water to
dilute to the scale. Mix well. 1.00 mL of this solution contains 1 μg of As.
6.6.1.3 Instruments and equipment
6.6.1.3.1 Atomic fluorescence spectrometer: equipped with an arsenic hollow cathode
lamp.
before use, pipette 10.00 mL of this solution into a 100 mL volumetric flask. Use water
to dilute to the scale. Mix well. 1.00 mL contains 0.001mg of As.
6.6.2.2.12 Lead acetate cotton.
6.6.2.3 Instruments and equipment
6.6.2.3.1 Spectrophotometer.
6.6.2.3.2 Arsenic fixer: meet the requirements in 4.2.2.3 of GB/T 610-2008.
6.6.2.4 Analysis steps
6.6.2.4.1 Preparation of specimen solution
Weigh about 25 g of liquid specimen or 12.5 g of solid specimen, accurate to 0.2 mg.
Place in a 100 mL beaker. Add 30 mL of water and 5 mL of nitric acid solution. Cover
and boil in a watch glass for about 1 min. Cool to room temperature and transfer to a
250 mL volumetric flask. Dilute to the scale. Shake well. This shall be test solution B,
used for testing As, Pb, Cd, Hg, Cr.
6.6.2.4.2 Drawing of calibration curve
6.6.2.4.2.1 Add 0.00 mL, 1.00 mL, 2.00 mL, 3.00 mL, 4.00 mL and 5.00 mL of arsenic
standard solution to six dry arsenic determination bottles in sequence. Then add 30 mL,
29 mL, 28 mL, 27 mL, 26 mL, 25 mL of water in sequence to make the total volume of
the solution 30 mL.
6.6.2.4.2.2 Add 20 mL of stannous chloride hydrochloric acid solution, 5 mL of
potassium iodide solution and 1 mL of copper sulfate solution to each arsenic bottle.
Shake well. At this time, the acid...