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GB/T 7489-1987 Water quality--Determination of dissolved oxygen--Iodometric method

Standard Number:  GB/T 7489-1987
Title:  Water quality--Determination of dissolved oxygen--Iodometric method
Language:  Simplified Chinese
Publication Date:  1987/3/6
Execute Date:  1987/8/1
Status:  Current
Standard Type:  Method
International Classification for Standards (ICS)ENVIRONMENT. HEALTH PROTECTION. SAFETY>>Water quality
Publisher:  Chinese Standards(GB)
Price:7.20  
Number of Pages:6P.;A4  

Description:Is the benchmark method for determination of dissolved oxygen in water by iodine volume method. In the absence of interference, this method is applicable to a variety of dissolved oxygen concentration is greater than 0.2 mg/l and less than twice the saturation concentration of water (about 20 mg/l). Easy oxidation of organic compounds, such as tannic acid, humic acid and lignin on the determination of interference. Oxidation of sulfur compounds, such as sulphide thiourea, also as easy to consume oxygen breathing system to produce interference. When containing such substances, should be taken Electricity chemical probe method. Nitrite concentration is not more than 15 mg/l won't produce interference, because they will be joining sodium azide destroy. Such as oxidatie substance or restore, need to improve the method of determination, see chapter 8. Such as existence can be fixed or iodine consumption of suspended solids, this method should be improved in the way described in appendix a rear can use.  
File Format:  PDF(Acrobat Reader) or Word version doc Document
File Size:  271KB
Tile in English:  Water quality--Determination of dissolved oxygen--Iodometric method

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