连续流动注射分析测定沼液中全氮和全磷含量

Determination of Total Nitrogen and Total Phosphorus Content in Biogas Slurry by Continuous Flow Injection Analyzer

摘要: 为提高沼液中氮、磷含量的检测效率和准确性,采用石墨消解仪消解沼液样品,应用连续流动注射分析仪测定沼液中氮、磷含量,研究了该方法的正确度、精密度、检出限和定量限。结果表明:氮的平均回收率为96.75%～104.50%,磷的回收率为100.82%～101.47%;测定结果具有较好的重复性和重现性;确定了全氮的检出限为10mg·L^-1、定量限为30mg·L^-1,全磷的检出限为4mg·L^-1、定量限为12mg·L^-1。该方法可用于沼液中全氮和全磷含量的快速高效测定。

Abstract: In order to improve the efficiency and accuracy of the total nitrogen and phosphorus content deteceion in biogas slurry,the samples of biogas slurry were digested by graphite digester and the content of nitrogen and phosphorus in biogas slurry was determined by continuous flow injection analyzer.The accuracy,precision,detection limit and quantitative limit of the method were studied.The results showed that the average recoveries of nitrogen and phosphorus were 96.75%-104.50% and 100.82%-101.47%,respectively.The results showed good repeatability and reproducibility.The detection limit of total nitrogen was 10 mg·L^-1,the quantitative limit was 30 mg·L^-1,the detection limit of total phosphorus was 4 mg·L^-1 the quantitative limit was 12 mg·L^-1.This method can be used for rapid and efficient determination of total nitrogen and total phosphorus in biogas slurry.