Comparative study on the determination of organic matter content in soil using potassium dichromate volumetric method and high-frequency infrared carbon sulfur analyzer method
The content of soil organic matter is an important indicator of soil fertility,and accurate measurement of its content has practical significance for agricultural production and soil environmental monitoring.There are currently two main methods for determining soil organic matter content:one is the potassium dichromate volumetric method,the other is the use of high-frequency infrared carbon and sulfur analyzer for measurement.Both methods indirectly determine the content of organic matter in soil by measuring the content of organic carbon and multiplying it by a correction coefficient.This article selected six soil and sediment reference materials with different contents and conducted measurements using two methods to examine the accuracy and precision of these methods.When the organic matter content of the sample was low,the precision of both methods was poor,but the potassium dichromate volumetric method was more stable and accurate.As the organic matter content increased,the results of both methods showed a stable state.In comparison,the high-frequency infrared carbon sulfur analyzer method had simple pre-treatment and convenient determination,and was suitable for rapid determination of organic matter in large quantities of soil samples.Selecting soil samples from a certain area in northern Henan for validation experiments,the organic matter content was determined using potassium dichromate volumetric method and high-frequency infrared carbon sulfur analyzer method,ranging from 15.8 to 29.0 g/kg.The results obtained by the two methods were basically consistent,with relative deviations of 0.8-1.1 g/kg and 0.6-1.0 g/kg,and precision of 2.8％-6.1％and 2.1％-6.2％,which met the detection requirements of relevant standards.
soil organic mattercapacity methodhigh frequency infrared carbon and sulfur analyzercontrastive study
万方数据
维普
