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Research on the Determination of Total Nitrogen and Total Phosphorus in Soil Using SmartChem140 Automatic Chemical Analyzer

CHEN Jian-lei;XIE Wen-xia;CUI Yu-qian;ZHANG Yan;College of Chemical Science and Engineering,Qingdao University;  
In this paper,we used the SmartChem140 Automatic Chemistry Analyzer method to determine total nitrogen(TN)and total phosphorus(TP)in the soil samples in Jiaozhou Bay wetland.The method can quickly and accurately determine TN and TP in the soil.The linear ranges of TN and TP were 0-6mg·L-1 and 0-5mg·L-1 with the correlation coefficients(R2)of 0.9994 and 0.9995,respectively.There were no significant difference between determination results of the method and those of the traditional kjeldah method and the Phosphorus molybdenum blue colorimetric method.The relative errors were less than4%,the relative standard deviations were 1.39% and 1.07% and the adding standard recoveries were97.68%-102.12% and 97.35%-101.88%,respectively.Results showed that the method had high accuracy and recovery,good stability with simple operation,and could meet the requirements for soil TN and TP monitoring.
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