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Spectrophotometric determination of Nitrate-Nitrogen in Waste Water with 2,6-Dimethylphenoe

WANG Hui-fa, ZHANG Hui-guo (Beidaihe Western Area Sewage Water Plant in Qinhuangdao City, Qinh uangdao 066000,China)  
A color reaction of nitrate with 2,6-dimethylphenol w as studied. In the medium of sulphuric acid and phosphoric acid, nitrate of waste water reacted with 2,6-dimethylphenol to form a stable complex 4-nitro-2,6-d imethylphenol.Beer's law was obeyed in the concentration range of 0~20 mg/L. The method was applied to determinating the wastewater, raw water, surface water an d drinking water with satisfactory results.
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