Determination of soil organic carbon content by steam bath-flow analyzer method
In order to determine the content of organic carbon in batch of soils accurately and efficiently,the colorimetric tube was selected instead of the boiling tube,the soil was digested by steam heating,and the organic carbon content was determined by flow analyzer method,and this method was compared with the potassium dichromate oxidation external heating method(conventional and universal)to explore the feasibility of the method.The results showed that the relative standard deviation of the repeated experiments for the determination of soil organic carbon by steam bath-flow analyzer was 3.19％-9.41％,and the recovery was 92.21％-97.63％.The precision and accuracy of the method were good.There was no significant difference between the measured results and those determined by potassium dichromate oxidation-external heating method(P＞0.05),the regression equation of the two methods was y(steam bath-flow analyzer method)=0.947x(potassium dichromate oxidation-external heating method)+1.621(r2=0.933),the correlation between them was good.Two methods were used to determine 200 soil organic carbon.The detection time of steam bath-flow analyzer method was 68％that of potassium dichromate oxidation-external heating method,and the manual operation time was 44％that of potassium dichromate oxidation-external heating method.The steam bath-flow analyzer method did not need ferrous sulfate,the dosage of potassium dichromate,sulphuric acid and water used was 40％of that of the potassium dichromate oxidation-external heating method.The steam bath-flow analyzer method had the advantage of less testing time,less manual operation time,lower working intensity of personnel,less reagent dosage,reduced environmental hazards,more accurate and efficient in detection,more quicker and economical in operation,the method could be recommended for the determination of soil organic carbon in large quantities.
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