The Research Of Effective Sulfur In Acidic And Neutral Soil Determined By Ion Chromatography

The country is more and more attention to the environmental protection work,more and more high to the requirement of ecological monitoring.Soil sulfur effectively as an important indicator of soil monitoring,necessary to determine.In view of the present soil effective monitoring method is restricted to the accuracy is not high sulfur turbidimetric method,steps and trival,generating detection limit,use of heavy metal waste,cause a harm to environment and experiment personnel,and many other adverse factors.This article first on the leaching of soil effective sulfur agent selection,firstly analyzes the Ca?H₂PO₄?₂ with and without acid and KH₂PO₄ solution leaching of the contrast,and analyzes the KCl solution,NaHCO₃ solution of soil leaching agent,ultimately determine the best KH₂PO₄ as soil leaching agent.Determines the ion chromatography determination of effective in acidic and neutral soil in the process of sulfur in the ion chromatograph eluent concentration for the tendency of 13L;Eluent flow rate of 1.2 mL/min,the best test condition,when the soil sample is 10.00 g,50.00 mL leaching agent,method detection limit of 1.52 mg/kg,determination of lower limit of 6.10 mg/kg.Six laboratories to 6.38 mg/kg,22.6 mg/kg of determined to repeat the same sample?n=6?:the laboratory relative standard deviation is 1.1%⁷.1%and 7.1%⁴.9%respectively;Laboratory between the relative standard deviation was 3.3%,3.3%respectively.About 227 ug samples containing sulfuric acid root,with 200 ug and 400 ugg,repeated measurement?n=6?,measured standard addition recovery was 87%,89%,the relative error is 0.8%.To the concentration of 22±5mg/k of standard samples were determined,measured value of 25.1 mg/kg,relative standard deviation is 5.56%,conform to the requirements.This study successfully using ion chromatograph to determine the effective sulfur content in acidic and neutral soil,greatly reduce the labor intensity of the experimenter,but also reduced the amount of poisonous reagent,reduce the toxic substances and laboratory personnel's health hazards to the environment.