1 Application Scope
This standard specifies the dichromate method for determination of chemical oxygen demand in water.
This standard is applicable to determination of the chemical oxygen demand in surface water, domestic sewage and industrial wastewater while not applicable to that in water with chlorid concentration greater than 1,000 mg/L (after dilution).
When the sampling volume is 10.0 ml, the detection limit for this method is 4 mg/L and the lower limit of determination is 16 mg/L. As for water sample without dilution, the upper limit is 700 mg/L. If such limit is exceeded, the sample must be diluted before determination.
2 Normative References
The provisions in the following documents are referenced for the purpose of this standard. For undated references, the valid versions shall apply.
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
For the purpose of this document, the following term and definition applies.
Foreword i
1 Application Scope
2 Normative References
3 Terms and Definitions
4 Method Principle
5 Interference and Elimination
6 Reagents and Materials
7 Instruments and Equipment
8 Samples
9 Analysis Procedures
10 Calculation and Expression of Test Results
11 Precision and Accuracy
12 Quality Assurance and Quality Control
13 Waste Treatment
14 Attentions
Annex A (Informative) Rough Judgment Method for Chlorine Ion Content
1 Application Scope
This standard specifies the dichromate method for determination of chemical oxygen demand in water.
This standard is applicable to determination of the chemical oxygen demand in surface water, domestic sewage and industrial wastewater while not applicable to that in water with chlorid concentration greater than 1,000 mg/L (after dilution).
When the sampling volume is 10.0 ml, the detection limit for this method is 4 mg/L and the lower limit of determination is 16 mg/L. As for water sample without dilution, the upper limit is 700 mg/L. If such limit is exceeded, the sample must be diluted before determination.
2 Normative References
The provisions in the following documents are referenced for the purpose of this standard. For undated references, the valid versions shall apply.
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
For the purpose of this document, the following term and definition applies.
Contents of HJ 828-2017
Foreword i
1 Application Scope
2 Normative References
3 Terms and Definitions
4 Method Principle
5 Interference and Elimination
6 Reagents and Materials
7 Instruments and Equipment
8 Samples
9 Analysis Procedures
10 Calculation and Expression of Test Results
11 Precision and Accuracy
12 Quality Assurance and Quality Control
13 Waste Treatment
14 Attentions
Annex A (Informative) Rough Judgment Method for Chlorine Ion Content
