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GB 15892-2020: Polyaluminium chloride for treatment of drinking water
GB 15892-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.80
G 77
Replacing GB 15892-2009
Polyaluminium chloride for treatment of drinking
water
ISSUED ON: JULY 23, 2020
IMPLEMENTED ON: AUGUST 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Molecular formula ... 5 
4 Product classification ... 5 
5 Requirements ... 5 
5.1 Raw material requirements ... 5 
5.2 Technical requirements ... 5 
6 Test methods ... 6 
6.1 General ... 6 
6.2 Determination of alumina (Al2O3) content ... 6 
6.3 Determination of basicity ... 12 
6.4 Determination of density ... 13 
6.5 Determination of insoluble matter content ... 14 
6.6 Determination of pH value ... 15 
6.7 Determination of iron content ... 15 
6.8 Determination of arsenic content ... 15 
6.9 Determination of lead content ... 20 
6.10 Determination of cadmium content ... 24 
6.11 Determination of mercury content ... 27 
6.12 Determination of chromium content ... 32 
7 Inspection rules ... 33 
8 Marking, packaging, transportation and storage ... 34 
Appendix A (Informative) Determination of coagulation performance ... 36 
Polyaluminium chloride for treatment of drinking
water
Warning - The strong acids and bases used in this Standard are corrosive.
During use, it shall avoid inhalation or contact with the skin. If splashed
on the body, it shall rinse immediately with plenty of water; in severe
cases, it shall seek medical attention immediately.
1 Scope
This Standard specifies the requirements, test methods, inspection rules,
marking, packaging, transportation and storage of polyaluminium chloride for
treatment of drinking water.
This Standard applies to polyaluminium chloride for treatment of drinking water.
The product is mainly used for the purification of drinking water.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T 320 Synthetic hydrochloric acid for industrial use
GB/T 601 Chemical reagent - Preparations of reference titration 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 4294 Aluminium hydroxide
GB/T 6678 General principles for sampling chemical products
the excess EDTA solution, to get alumina (Al2O3) content.
6.2.1.2 Reagents and materials
6.2.1.2.1 Carbon dioxide-free water.
6.2.1.2.2 Nitric acid solution: 1+12.
6.2.1.2.3 Aqueous ammonia solution: 1+1.
6.2.1.2.4 Disodium ethylenediaminetetraacetic acid (EDTA) solution: c(EDTA)
is about 0.05 mol/L.
6.2.1.2.5 Acetic acid-sodium acetate buffer solution (pH=5.5): WEIGH 272 g of
sodium acetate (trihydrate) and dissolve it in water; ADD 19 mL of glacial acetic
acid; and dilute to 1000 mL.
6.2.1.2.6 Alumina standard solution: 1 mL contains 0.001 g of Al2O3. WEIGH
0.5293 g of high-purity aluminium (≥99.99%), accurate to 0.2 mg. PLACE it in
a 200 mL polyethylene cup; ADD 20 mL of water; ADD about 3 g of sodium
hydroxide, to make it all dissolved and transparent (if necessary, heat on a
water bath). USE hydrochloric acid solution (1+1) to adjust to acidic and then
add 10 mL, to make it transparent, cool; TRANSFER to a 1000 mL volumetric
flask; DILUTE to the mark and shake well.
6.2.1.2.7 Zinc chloride reference titration solution: c(ZnCl2) is about 0.025 mol/L;
prepare as follows:
a) Preparation: WEIGH 3.5 g of zinc chloride (ZnCl2); DISSOLVE it in
hydrochloric acid solution [0.05% (volume fraction)]; DILUTE to 1 L and
shake well.
b) Calibration: PIPETTE 20 mL of EDTA solution and 40 mL of alumina
standard solution; PUT them in a 250 mL conical flask; follow the steps in
6.2.1.3 "ADD 10 mL of nitric acid solution..." to start the operation. READ
the consumption V (mL) of the zinc chloride reference titration solution. In
addition, pipette 20 mL of EDTA solution and place it in a 250 mL conical
flask. Follow the steps in 6.2.1.3 "ADD 10 mL of nitric acid solution..." to
start the operation. READ the consumption V0 (mL) of the zinc chloride
reference titration solution.
c) Result calculation: The concentration of zinc chloride reference titration
solution, c(ZnCl2), value expressed in moles per liter (mol/L), is calculated
according to formula (1):
Where:
V0 - The value of the volume of sodium hydroxide reference titration solution
consumed in the blank test, in milliliters (mL);
V - The value of the volume of sodium hydroxide reference titration solution
consumed for determination of the sample, in milliliters (mL);
c - The exact value of the actual concentration of sodium hydroxide reference
titration solution, in moles per liter (mol/L);
M - The value of the molar mass of hydroxide (OH-), in grams per mole (g/mol)
(M=16.99);
m - The value of the mass of the test portion, in grams (g);
w1 - The mass fraction of alumina measured in 6.2;
V1 - The value of the volume of test solution A pipetted, in milliliters (mL) (V1=25);
VA - The value of the total volume of test solution A, in milliliters (mL) (VA=250);
M1 - The value of the molar mass of aluminium, in grams per mole (g/mol)
(M1=26.98);
M2 - The value of the molar mass of alumina, in grams per mole (g/mol)
(M2=101.96).
6.3.5 Allowable difference
USE the arithmetic mean of the parallel determination results as the
determination result. The absolute difference of the parallel determination
results is not more than 2.0%.
6.4 Determination of density
6.4.1 Method summary
From the depth of immersion when the densitometer reaches the equilibrium
state in the measured liquid, read the density value.
6.4.2 Apparatus
6.4.2.1 Densitometer: The division value is 0.001 g/cm3.
6.4.2.2 Constant-temperature water bath: Controllable temperature (20±0.1)°C.
6.4.2.3 Thermometer: The division value is 0.1 °C.
standard solution respectively in five 100 mL volumetric flasks. Respectively
add 5.0 mL of hydrochloric acid and 20 mL of thiourea solution; USE water to
dilute to the mark and shake well; PLACE for more than 30 min. The mass
concentrations of arsenic in this series of solutions are 0 μg/L, 4 μg/L, 8 μg/L,
12 μg/L, 16 μg/L, respectively.
6.8.1.4.2 After the instrument is stable, use potassium borohydride-sodium
hydroxide solution as the reducing agent; USE hydrochloric acid solution as the
carrier solution; under the best working conditions of the instrument, measure
its fluorescence value. USE the measured fluorescence value as the ordinate;
USE the corresponding mass concentration of arsenic (μg/L) as the abscissa,
to draw a calibration curve and calculate the regression equation.
Note: When using an atomic fluorescence spectrometer for determination, the required
potassium borohydride solution concentration, carrier solution concentration, linear
range of calibration curves of various elements, pH value of sample solution, etc. will