GB 19106-2013 English PDF (GB19106-2013)

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GB 19106-2013: [GB/T 19106-2013] Sodium hypochlorite
GB 19106-2013
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.060.50
G 12
Replacing GB 19106-2003
Sodium hypochlorite
次氯酸钠
ISSUED ON: NOVEMBER 27, 2013
IMPLEMENTED ON: DECEMBER 01, 2014
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
This standard was changed into recommended standard from March 23,
2017. Its number was changed into GB/T 19106-2013.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Requirements ... 6 
4 Sampling ... 6 
5 Test method ... 7 
6 Inspection rules ... 15 
7 Marking, packaging, transportation, storage ... 16 
Sodium hypochlorite
Warning: Sodium hypochlorite is highly corrosive. Operators shall take
appropriate safety and health measures. Persons exposed to it shall wear
protective glasses, acid and alkali resistant gloves and other protective
equipment.
1 Scope
This standard specifies the requirements, sampling, test methods, inspection
rules and signs, packaging, transportation, storage of sodium hypochlorite.
This standard applies to sodium hypochlorite, which is prepared by chlorination
of sodium hydroxide.
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 standard.
GB 190 Packing symbol of dangerous goods
GB/T 191 Pictorial marking for handling of goods (GB/T 191-2009, ISO
780:1997, MOD)
GB/T 601 Chemical reagent - Preparations of standard volumetric solutions
GB/T 602 Chemical reagent – Preparations of standard solutions for impurity
determination (GB/T 602-2002, ISO 6353-1:1982, NEQ)
GB/T 603 Chemical reagent – Preparations of reagent solution for use in test
(GB/T 603-2002, ISO 6353-1:1982, NEQ)
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 6682-2008, ISO 3696:1987, MOD)
GB/T 8170 Rules of rounding off for numerical values and expression and
judgement of limiting values
date, sampling amount, sampling date, name of the sampler.
5 Test method
Safety Tips: Some reagents in this test method are toxic or corrosive, so
it shall be careful when handling them! If splashed on the skin, rinse
immediately with water, AND seek medical treatment immediately, in
severe cases.
5.1 General provisions
The reagents and water, which are used in this standard, refer to analytical
reagents and the grade-3 water, which are specified in GB/T 6682, unless
otherwise specified. The standard titration solution, impurity standard solution,
preparations, products, which are used in the test, are all prepared in
accordance with GB/T 601, GB/T 602, GB/T 603, unless otherwise specified.
5.2 Appearance
Observe visually under natural light.
5.3 Determination of available chlorine
5.3.1 Method summary
In an acidic medium, hypochlorite reacts with potassium iodide, to precipitate
iodine. Using starch as the indicator solution, use sodium thiosulfate standard
titration solution to make titration, until the blue color disappears, which is
regarded as the end point. The reaction formula is as follows:
5.3.2 Reagents
5.3.2.1 Potassium iodide solution: 100 g/L. Weigh 100 g of potassium iodide;
dissolve it in water; dilute to 1000 mL; shake well.
5.3.2.2 Sulfuric acid solution: 3 + 100. Pipette 15 mL of sulfuric acid; slowly
inject 500 mL of water; cool it down; shake well.
5.3.2.3 Sodium thiosulfate standard titration solution: c(Na2S2O3) = 0.1 mol/L.
5.3.2.4 Starch indicator solution: 10 g/L.
5.3.3 Instruments
5.5.4 Analytical procedures
5.5.4.1 Drawing of standard curve
5.5.4.1.1 Pipette 0.00 mL, 2.00 mL, 4.00 mL, 6.00 mL, 8.00 mL, 10.00 mL of
iron standard solution (5.5.2.5), respectively, into six 100 mL volumetric flasks.
Add 5 mL of hydroxylamine hydrochloride solution, 10 mL of acetic acid-sodium
acetate buffer solution, 5 mL of 1,10-phenanthroline indicator solution, to each
volumetric flask. Use water to dilute it to the mark. Shake well. Let it stand for
10 min.
5.5.4.1.2 Using water as a reference, adjust the spectrophotometer to zero.
Select an appropriate cuvette, at a wavelength of 510 nm, to measure the
absorbance.
5.5.4.1.3 The absorbance of the blank solution is subtracted from the
absorbance of the standard colorimetric solution. Use the mass (mg) of iron, in
the 100 mL standard colorimetric solution, as the abscissa; use the
corresponding absorbance as the ordinate, to draw the standard curve or
regression linear equation.
5.5.4.2 Blank test
Without adding sample solution, use exactly the same analytical procedures,
reagents, dosage, as the test sample solution, to carry out blank test.
5.5.4.3 Determination
Pipette 50.00 mL of sample solution A. Place it in a 100 mL volumetric flask.
Add hydrogen peroxide solution dropwise, until it does not contain hypochlorite
(not make the starch-potassium iodide test paper blue). Then add 5 mL of
hydroxylamine hydrochloride solution, 10 mL of acetic acid-sodium acetate
buffer solution, 5 mL of 1,10-phenanthroline indicator solution. Use water to
dilute it to the mark. Shake well. Let it stand for 10 min. The following shall be
carried out, in accordance with the provisions of 5.5.4.1.2.
5.5.5 Result calculation
The iron content is expressed in the mass fraction of iron (Fe), w3; the value is
expressed in % AND calculated according to formula (3):
Where:
m1 - The value of the mass of the specimen, in grams (g);
m2 - The value of the mass of iron, which is obtained from the standard curve
OR calculated by the unitary linear regression equation, corresponding to
the absorbance of the sample solution, after subtracting the absorbance of
the blank solution, in micrograms (mg).
5.5.6 Tolerance
Take the arithmetic mean of the parallel measurement results, as the
measurement result. The absolute value of the difference, between the parallel
determination results, is not more than 0.001%.
5.6 Determination of heavy metals
5.6.1 Method summary
Under the condition of weak acidity (pH 3 ~ 4), heavy metal ions and sulfide
ions in the sample will form a brown-black precipitate. Compared with the lead
standard solution, which is treated by the same method, a limit test is performed.
5.6.2 Reagents and materials
5.6.2.1 Hydrochloric acid.
5.6.2.2 Hydrogen peroxide solution: 1 + 5.
5.6.2.3 Acetic acid-sodium acetate buffer solution: pH value is about 3.
5.6.2.4 Saturated solution of hydrogen sulfide. Lead hydrogen sulfide gas into
water, which does not contain carbon dioxide, until it is saturated. Prepare this
solution before use.
5.6.2.5 Sodium sulfide solution. Weigh 5 g of sodium sulfide. Dissolve it in a
mixture of 10 mL of water and 30 mL of glycerol. Store it in a sealed container
in the dark. It is valid for one month.
5.6.2.6 Lead standard solution: 0.1 mg/mL.
5.6.2.7 Lead standard solution: 0.01 mg/mL. Take an appropriate amount of
lead standard solution (5.6.2.6). Dilute it by 10 times. Prepare this solution
before use.
5.6.2.8 Phenolphthalein indicator solution: 10 g/L.
5.6.2....