GB/T 27849-2011 Chemical Degradation Screening Test Chemical Oxygen Demand GB/T27849-2011 |tt||Standard compression package decompression password: www.bzxz.net
This standard specifies the test method for chemical degradation screening test chemical oxygen demand. This standard is applicable to most low-volatile solid or liquid organic substances. This standard provides a method for determining the oxidizing ability of a substance.
This standard was drafted in accordance with the rules given in GB/T1.1-2009.
This standard has the same technical content as the European Commission Regulation 440/2008: Test methods for Regulation No. 1907/2006 of the European Parliament and of the Council on Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) Regulation Method C.6 (2008) "Degradation--Chemical Oxygen Demand" (English version).
This standard has been modified in the following structural and editorial aspects:
———Change the measurement unit to the legal measurement unit of China;
———Change the name of the standard to "Chemical Oxygen Demand for Degradation Screening Test of Chemicals" to be consistent with the existing standard series;
———In the provisions of terms and definitions, the definitions consistent with the national standards already issued by China are adopted.
This standard is proposed and managed by the National Technical Committee for Standardization of Dangerous Chemicals Management (SAC/TC251).
The drafting units of this standard are: Chemical Registration Center of the Ministry of Environmental Protection, Shanghai Testing Center, National Quality Supervision and Inspection Center for Dangerous Chemicals, Nanjing Institute of Environmental Sciences of the Ministry of Environmental Protection, Beijing Normal University, and Jiangsu Entry-Exit Inspection and Quarantine Bureau.
The main drafters of this standard are: Nie Jinglei, Liu Chunxin, Chen Lin, Chen Xiaoqian, You Rong, Zhang Jingji, Wang Na, Wang Lei, Liu Jun, and Tang Lijun.

ICs13.300;13.020.40
National Standard of the People's Republic of China
GB/T27849-—2011
Chemicals
Degradation screening test
Chemical oxygen demand
Chemicals-Degradation screening test-Chemical oxygen demandIssued on 2011-12-30
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaAdministration of Standardization of the People's Republic of China
Implementation on August 1, 2012
This standard was drafted in accordance with the specifications given in GB/T1.1·-2009. GB/T 27B49—2011
This standard has the same technical contents as Regulation (EC) 440/2008 of the European Commission: Test methods for Regulation (EC) No. 1907/2006 of the European Commission and of the Council on Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) - Method C.6 (2008) Degradation: Chemical Oxygen Demand (English version).
This standard has been modified in the following structure and editorial aspects: the unit of measurement has been changed to the legal measurement unit of my country; first, to be consistent with the existing standard series, the name of the standard has been changed to "chemical oxygen demand for chemical degradation screening test" ... In the provisions of terms and definitions, the definitions consistent with the national standards already issued in my country are adopted. This standard is proposed and managed by the National Technical Committee for Standardization of Hazardous Chemicals Management (SAC/TC251). The drafting units of this standard are: Chemical Registration Center of the Ministry of Environmental Protection, Shanghai Testing Center, National Hazardous Chemicals Supervision and Inspection Center, Nanjing Institute of Environmental Sciences of the Ministry of Environmental Protection, Beijing Normal University, and Jiangsu Exit-Entry Inspection and Control Bureau. The main drafters of this standard are: Nie Jinglei, Liu Chunxin, Chen Lin, Chen Xiaoqing, You Rong, Zhang Jingji, Wang Na, Wang Lei, Liu Jun, and Tang Lijun.1
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G B/T27849—2011
The purpose of this method is to determine the chemical oxygen demand (COD) of solid or degradable organic compounds using a dedicated standard method under fixed test conditions.
The molecular formula of the substance can help guide the test and interpret the test results (e.g. halogen salts, ferrous salts of organic compounds, organic chlorides).
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1 ScopebzxZ.net
Chemical oxygen demand for chemical degradation screening test This standard specifies the test method for chemical oxygen demand for chemical degradation screening test. This standard is applicable to most low-volatile solid or liquid organic substances. This standard gives a method for determining the oxidizable ability of a substance. 2 Terms and definitions
The following terms and definitions apply to this document. 2.1
Chemical oxygen demand, CODCB/T 27849—2011
Under strong acid and heating conditions, the amount of oxidant consumed by a certain amount of dichromate to oxidize the reducing substances in the water sample can be expressed as milligrams of oxygen consumed per gram of the test substance (g/ng). 3
Test substance information
Test substance information includes:
Molecular formula or structural formula:
b) Purity and impurity components:
c) Solubility in water;
d) Boiling point or vapor pressure.
4 Comparative substance
Reference substance: It is used to calibrate the measurement method, check the quality of the reagents, and It can be used to compare the test results obtained by different methods. It is not necessary to use a reference substance when testing any new substance. 5 Principle of the method
Dissolve or disperse a certain amount of the test substance in distilled water, use silver iodide as an oxidant, and heat and reflux for two hours in a sulphuric acid medium with a known amount of potassium dichromate. The remaining dichromate content is titrated with a standard ammonium ferrous sulfate solution. The amount of oxidant consumed by the reducing substances in the water sample is calculated based on the amount of ammonium ferrous sulfate used. When determining chlorine-containing substances, the interference of chloride is reduced by adding mercuric sulfate. Note: After the test, mercury-containing salts and mercury-containing products should be disposed of without chemical treatment to prevent environmental pollution. 6 Test procedure
6.1 Test substance stock solution
For soluble test substances, prepare a test substance stock solution with a C[)D of 250 mg/L to 600 mg/L; for poorly soluble or non-dispersible test substances, weigh out a fine powder or liquid test substance equivalent to about 5 mg C[)D and place it in the test apparatus together with distilled water. 6.2 Test operation
The C[)D of the test substance solution or fraction can be determined according to any appropriate national or international standard method. Note: The method of ISO 6060 is recommended. Quality Assurance and Quality Control
Notes are as follows:
a) Chemical oxygen content is an indicator of the oxidizability of organic matter under specific conditions and should be carried out strictly according to the operating procedures. b) Chlorides, inorganic reducing agents or oxidants will affect the measured value of COD during the determination. Some cyclic compounds and many volatile substances (such as low-level fatty acids) cannot be completely oxidized during the determination, which will affect the determination results.
8 Data and Report
8. 1 Data processing
The COD value in the test device can be calculated by the selected standardized method and then converted into grams of COD per gram of the test substance.
The chemical oxygen demand should be the average value of at least three parallel tests. 8.2. Result report
The test report should include the following:
a) Test substance:
Chemical property identification data:
-Physical state, impurities and inherent components (if known); solubility, volatility data and other information and explanations that may affect the test results. b) Test conditions:
=-Preparation method of solution/dispersion of the test substance;-Name and standard number of the method standard referenced in the test,-The use of mercuric sulfate to reduce the interference of nitrogen compounds. Results:
.-Measurement data:
The test results are converted into grams of COD per gram of the test substance. d Discussion of results:
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References
GB/T27849—2011
f1] IS0) 6060 Water qualiry: chemical oxygen denand dichromate methodsL2J ISBN O 11 7512494 Chemical oxygen demand (dichromate value) of polluted and wastcwaters
[3] DIV 38409-H-41 Determination of the chemical oxygen demand(COD)within thc rangcabove 15mg per liire
[4] Gerike, P. The biodegradability testing of poorly water soluble compounds, Chemosphcre,1984,vo1. 13,169
L5] Kelkenberg, H. ,Z. van Wasser und Abwasserforschung,1975,vol. 8,146NBVT91-201 Determination of the chemical oxygen demand[6]
[7] NEN 3235 5. 3 Bcpaling van het chetnisch zuurstofverbruik[8] NF T 90-101 Determination of the chemical oxygen demandTTTKANYKAA
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