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GB/T 10666-2019 (GB/T10666-2019)

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GB/T 10666-2019: PDF in English (GBT 10666-2019)
GB/T 10666-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.060.50
G 12
Replacing GB/T 10666-2008
Calcium Hypochlorite
次氯酸钙(漂粉精)
ISSUED ON: JUNE 04, 2019
IMPLEMENTED ON: MAY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Requirements ... 6
4 Sampling ... 6
5 Test Methods ... 7
6 Inspection Rules ... 14
7 Marking, Packaging, Transportation and Storage ... 15
Appendix A (Informative) Water Densities under Different Temperatures ... 17
Calcium Hypochlorite
Warning -- Calcium hypochlorite is corrosive and oxidizing. Personnel using this
standard shall have practical experience in formal laboratory work. This
standard does not point out all possible safety issues. The user is responsible
for taking appropriate safety and health measures and ensuring compliance with
the conditions stipulated by relevant national regulations.
1 Scope
This Standard specifies the requirements, sampling, test methods, inspection rules,
marking, packaging, transportation and storage of calcium hypochlorite (bleaching
powder concentrated).
This Standard is applicable to calcium hypochlorite (bleaching powder concentrated)
(hereinafter referred to as the product).
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) is applicable to this document.
GB 190 Packing Symbol of Dangerous Goods
GB/T 191 Packaging – Pictorial Marking for Handling of Goods
GB/T 601 Chemical Reagent - Preparations of Standard Volumetric Solutions
GB/T 603 Chemical Reagent - Preparations of Reagent Solutions for Use in Test
Methods
GB/T 6003.1 Test Sieves - Technical Requirements and Testing - Part 1: Test
Sieves of Metal Wire Cloth
GB/T 6678 General Principles for Sampling Chemical Products
GB/T 6679 General Rules for Sampling of Solid Chemical Products
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods
5 Test Methods
5.1 Test provisions
The reagents and water used in this standard refer to analytically-pure reagents and
the Class-III water specified in GB/T 6682 when other requirements are not specified.
The preparation of standard titration solutions, formulations and products used in the
test, unless other requirements are specified, are prepared in accordance with the
provisions of GB/T 601 and GB/T 603.
5.2 Appearance
Observe the sample visually under natural light.
5.3 Determination of available chlorine
5.3.1 Principle of the method
In an acidic medium, hypochlorite reacts with potassium iodide to precipitate iodine.
Use starch as an indicator, titrate by sodium thiosulfate standard titration solution, and
the disappearance of blue is the end point. The reaction formula is as follows:
5.3.2 Reagents and solutions
Warning – sulfuric acid is highly corrosive.
5.3.2.1 Potassium iodide solution: 100g/L. Take 100g of potassium iodide and dissolve
it in 1000mL of water.
5.3.2.2 Sulfuric acid solution: 3+100. Take 30mL of sulfuric acid; slowly pour it into
1000mL of water; cool off; and shake well.
5.3.2.3 Sodium thiosulfate standard titration solution: c(Na2S2O3) = 0.1mol/L.
5.3.2.4 Soluble starch solution: 10g/L. The use period is two weeks.
5.3.3 Apparatus
5.3.3.1 General laboratory equipment.
5.3.3.2 Burette: 50mL, Grade-A, scale value of 0.1mL.
5.3.3.3 One-mark pipette: 25mL, Grade-A.
The water and toluene in the sample azeotrope when heated; use the nature that the
toluene and water are immiscible to separate the water.
5.4.1.2 Reagents
Toluene. Dehydrate before use.
5.4.1.3 Apparatus
5.4.1.3.1 General laboratory equipment.
5.4.1.3.2 Moisture measuring device: moisture measuring device and glycerin bath or
adjustable temperature electric heating jacket (accuracy of ± 1°C, see Figure 1).
5.4.1.3.3 Moisture measuring device: 500mL round bottom flask and measuring tube.
Among them, the volume of the measuring tube is 10mL (the scale value of
0mL~0.3mL is 0.03mL).
5.4.1.4 Test procedures
Take about 100g of the sample (accurate to 0.01g); place it in a dry 500mL flask (b in
Figure 1); and add 200mL of toluene (limited to the submerged sample). Install the
instrument according to Figure 1; the system is airtight; and turn on the cooling water
of the condenser (d in Figure 1). Slowly heat in a glycerin bath or adjustable
temperature electric heating jacket (a in Figure 1); keep the temperature at 135°C
~140°C; perform reflux; and control the reflux speed to 2 drops/s~4 drops/s. When the
water layer of the solution in the metering tube (c in Figure 1) no longer increases, stop
heating and cooling. After the interface between toluene and water in the measuring
tube (c in Figure 1) is clear, record the volume of water V2. Refer to Appendix A for the
density of water at different temperatures.
more than 0.2%. Take the arithmetic mean of the parallel determination results as the
measurement result.
5.4.2 Drying method
5.4.2.1 Principle of the method
Lay the quantitative sample in a weighing bottle for the specified size and heat it at the
specified temperature. Then weigh it.
5.4.2.2 Apparatus
5.4.2.2.1 General laboratory equipment.
5.4.2.2.2 Infrared quick dryer or electric heating blast drying oven, may be controlled
at 105°C ~115°C.
5.4.2.2.3 Weighing bottle: ϕ60mm×30mm.
5.4.2.3 Test procedures
Use a weighing bottle to weigh about 5g of sample (accurate to 0.01g); place it in the
middle of the infrared lamp of the rapid dryer or in a drying oven; and dry it at 105°C
~115°C for 30min. Cool to room temperature and weigh it.
5.4.2.4 Test data processing
The moisture is expressed by the mass fraction, w3, of water (H2O), and calculated
according to Formula (3):
Where:
m3 – the value of mass of the sample, in g;
m4 – the value of the mass of the dried sample, in g.
5.4.2.5 Tolerance
The absolute value of the difference between the parallel determination results is no
more than 0.2%. Take the arithmetic mean of the parallel determination results as the
measurement result.
5.5 Stability inspection - determination of the available chlorine loss
5.5.1 Principle of the method
Type inspection shall also be carried out in one of the following situations:
--- The key production process has changed;
--- The main raw materials have changed;
--- Resume production after stopping production;
--- After major production equipment are adjusted significantly.
6.2 Judgment and reinspection rules
6.2.1 Judgment rules
6.2.1.1 Product quality indicators shall be judged according to the "Round-off
Comparison Method " specified in GB/T 8170.
6.2.1.2 The product shall be inspected by the quality inspection department of the
manufacturer in accordance with the provisions of this Standard; and the quality of the
product shall be judged based on the inspection results and standard requirements;
and a quality certificate shall be provided.
6.2.1.3 When the product leaves the factory, each batch of products shall be
accompanied by a quality certificate, which includes: the name of the company, product
name, model, batch number or production date, batch size, product quality certification
that conforms to this Standard, the implementation standard number, and the
company’s quality control seal.
6.2.2 Reinspection rules
If an indicator of the inspection result does not meet the requirements of this Standard,
double sampling units from the same batch of products shall be taken for reinspection.
Even if there is an indicator that does not meet the requirements of this standard in the
reinspection results, this batch of products is judged to be unqualified.
7 Marking, Packaging, Transportation and Storage
7.1 Marking
The outer packaging of the ex-factory product shall have an obvious and firm mark,
which includes: company name, address, product name (labelling: sodium method or
calcium method), model, net content, batch number or production date, production
license number and logo, this Standard number, "oxidant" and "corrosive" signs
specified in GB 190. The outer packaging should also have the "fear of rain" sign
specified in GB/T 191.
......
 
(Above excerpt was released on 2021-01-10, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT10666-2019