Determination of Nitrate-N in Water by 2-Isopropyl-5-methyphenol Spectrophotometry / 环境与健康杂志

ABSTRACT

Objective To develop a rapid determination method of nitrate-N in water.Methods In concentrated sulfuric acid,2-isopropyl-5-methyphenol reacts on nitrate and produces the nitro-compound which may turn into the yellow compound in the alkaline solution for the moleculars rearrange.The content of nitrate-N in water can be calculated according to the absorption value at the wave length of 415 nm.Results A good linear relation was found between the concentrations of nitrate-N and the absorption values in the range of 0-15.0 mg/L.The lowest determination concentration was 0.25 mg/L,the recovery rates were 96%-108% and RSD was 1.6%-4.0%.The results were consistent with those determined by UV spectrophotometry.Conclusion The method was simple,sensitive,rapid and accurate.