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Comparison and Optimization Study of Several Methods of Field Rapid Detection for Water Quality

YU Li-ting1,ZHAO Zhen-hua2,TAO Hai-qiang1(1.College of Dayu,Hohai University,Nanjing 210098,China;2.State Key Laboratory of Hydrology-water Resources and Hydraulic Engineering,Hohai University,Nanjing 210098,China)  
This paper compares and optimizes several methods of field rapid detection for ammonia nitrogen and nitrate nitrogen in water and the results show that Hach test has the highest accuracy and stability,but its popularity and application are limited because of its detection cost.The test accuracy of domestic electronic colorimetric method is poor,but its changing trend for different water qualities is consistent with that of the international standard method,so it can be used for the preliminary screening of water samples.The test accuracy of spectrophotometer method in combination with domestic electronic colorimetric agents is good,and it is more economical and portable than Hach method,so it can take the place of Hach method to some extent.In addition,during the ammonia nitrogen inspection process with Hach method,it is needed to add some masking agents into the water samples according to the practice,but it is not recommended to add masking agent for the nitrate nitrogen test.
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