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GB/T 7493-1987 Water quality--Determination of nitrogen(nitrite)--Spectrophotometric method

Standard Number:  GB/T 7493-1987
Title:  Water quality--Determination of nitrogen(nitrite)--Spectrophotometric 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:6.00  
Number of Pages:5P.;A4  

Description:This standard specifies using spectrophotometric method determination of drinking water, groundwater, surface water and wastewater by nitrite nitrogen method. Determination of upper limit when try to take maximum volume (50 ml), using this method can be used to measure nitrite nitrogen concentration of 0.20 mg/l. Minimum concentration detection using optical path length of 10 mm color dish, try a volume of 50 ml, with absorbance of chroma value is stere of 0.01 units the minimum detection limit concentration, the value of 0.003 m G/l. The optical path length of 30 mm color dish, try a volume of 50 ml, minimum detection concentration of 0.001 mg/l. Sensitivity of the optical path length of 10 mm color dish, try a volume of 50 ml, nitrite nitrogen concentration of cn = 0.20 mg/l, give the absorbance of about 0.67 units. Interference when the sample ph 11 or higher, you may encounter some interference, in this case, try to copy with phenolphthalein solution (3.12) Chase) 1 drop, stirring edge drop join phosphate solution (3.4), and red just disappear. By means of this process, after adding chromogenic agent system ph 1.8 0.3 mm, without affecting the measurement. And suspended solids, color sample if you have to add 2 ml per 100 ml sample aluminum hydroxide slurry (3.9), stirring, let stand, filtering, abandon to 25 ml after the initial filtrate, try to take a measurement. Water samples in common interfering substance content scope may be produced See appendix a. Including chloramine, chlorine, thiosulfate and sodium phosphate and ferric iron ions have obvious interference.  
File Format:  PDF(Acrobat Reader) or Word version doc Document
File Size:  778KB
Tile in English:  Water quality--Determination of nitrogen(nitrite)--Spectrophotometric method

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