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HJ828-2017

Chinese Standard: 'HJ828-2017'
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HJ 828-2017
NATIONAL ENVIRONMENTAL PROTECTION STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Replacing GB 11914-89
Water quality - Determination of the chemical oxygen
demand - Dichromate method
水质 化学需氧量的测定 重铬酸盐法
ISSUED ON: MARCH 30, 2017
IMPLEMENTED ON: MAY 01, 2017
Issued by: Ministry of Environmental Protection
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Principle of the method ... 6 
5 Interference and elimination ... 6 
6 Reagents and materials ... 6 
7 Instruments and apparatuses ... 9 
8 Sample ... 9 
9 Analysis steps ... 9 
10 Result calculation and expression ... 11 
11 Precision and accuracy ... 11 
12 Quality assurance and quality control ... 12 
13 Waste disposal ... 12 
14 Matters needing attention ... 13 
Appendix A (Informative) Rough determination method of chloride ion content
... 14 
Water quality - Determination of the chemical oxygen
demand - Dichromate method
WARNING: The reagent, mercuric sulfate, that is used in this method is
highly toxic, and laboratory personnel shall avoid direct contact with it.
Sample preparation shall be performed in a fume hood.
1 Scope
This Standard specifies the dichromate method for determining chemical
oxygen demand in water.
This Standard applies to the determination of chemical oxygen demand in
surface water, domestic sewage and industrial wastewater. This Standard does
not apply to the determination of chemical oxygen demand in water, of which
the chloride concentration is greater than 1000 mg/L (after dilution).
When the sampling volume is 10.0 ml, the detection-limit of this method is 4
mg/L, and the lower limit of determination is 16 mg/L. The upper limit of
determination of undiluted water samples is 700 mg/L; when the limit is
exceeded, the determination shall be made after dilution.
2 Normative references
This Standard refers to the terms of the following documents. For undated
references, the valid edition applies to this Standard.
GB 11896, Water quality - Determination of chloride - Silver nitrate titration
method
GB 17378.4, The specification for marine monitoring - Part 4: Seawater
analysis
HJ 506, Water quality - Determination of dissolved oxygen - Electrochemical
probe method
HJ/T 91, Technical specifications requirements for monitoring of surface
water and waste water
3 Terms and definitions
The following terms and definitions are applicable to this Standard.
6.1 Sulfuric acid (H2SO4), ρ = 1.84 g/ml, guaranteed reagent.
6.2 Potassium dichromate (K2Cr2O7): primary reagent; take an appropriate
amount of potassium dichromate and dry in a 105°C oven to constant weight.
6.3 Silver sulfate (Ag2SO4).
6.4 Mercury sulfate (HgSO4).
6.5 Ammonium ferrous sulfate ([(NH4)2Fe(SO4)2·6H2O]).
6.6 Potassium hydrogen phthalate (KC8H5O4).
6.7 Ferrous sulfate heptahydrate (FeSO4·7H2O).
6.8 Sulfuric acid solution: 1+9 (V/V).
6.9 Potassium dichromate standard solution
6.9.1 Potassium dichromate standard solution c ( K2CR2O7) = 0.250 mol/L.
Accurately weigh 12.258 g of potassium dichromate (6.2); dissolve it in water;
fix-volume to 1000 ml.
6.9.2 Potassium dichromate standard solution c ( K2CR2O7) = 0.0250 mol/L.
Dilute the potassium dichromate standard solution (6.9.1) 10 times.
6.10 Silver sulfate-sulfuric acid solution.
Weigh 10 g of silver sulfate (6.3); add it to 1 L of sulfuric acid (6.1); leave it for
1 ~ 2 day(s) to dissolve it; shake it well; shake carefully before use.
6.11 Mercury sulfate solution, ρ = 100 g/L.
Weigh 10 g of mercury sulfate (6.4); dissolve in 100 ml of sulfuric acid solution
(6.8); mix it well.
6.12 Ammonium ferrous sulfate standard solution
6.12.1 Ammonium ferrous sulfate standard solution, c[(NH4)2Fe(SO4)2·6H2O] ≈
0.05 mol/L.
Weigh 19.5 g of ammonium ferrous sulfate (6.5) to dissolve in water; add 10 ml
of sulfuric acid (6.1); dilute to 1000 ml after the solution is cooled.
7 Instruments and apparatuses
7.1 Reflux device: All-glass reflux device for 250 ml conical flask with grinding
mouth. Water-cooled or air-cooled all-glass reflux device can be selected. Other
equivalent condensation reflux devices are also applicable.
7.2 Heating device: electric furnace or other equivalent digestion device.
7.3 Analytical balance: sensitivity of 0.0001 g.
7.4 Acid burette: 25 ml or 50 ml.
7.5 Instruments and apparatuses that are commonly used in general
labor......
Related standard:   HJ 822-2017  HJ 823-2017
   
 
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