摘要
主要探究将高频红外碳硫仪运用于耕地质量调查土壤有机质含量测定,并通过控制变量法对称样量、高纯铁和高纯钨粒助熔剂的加入量进行优化,得到的最优化的测量条件为样品称样量0.05 g,高纯铁和高纯钨粒的加入量分别为0.4和1.5 g;在最佳的测试条件下,得到该测定方法的检出限为0.028%,相对标准偏差(RSD)<5%,测定值与标准物质的认定值偏差结果均在允许的偏差范围内。通过将该方法运用于安徽东至地区的耕地质量调查点位的土壤有机质分析,发现测定结果与重铬酸钾容量法和实验室间比对测定结果具有高度的一致性,说明该方法检出限、准确度和精密度均满足耕地土壤样品有机质检测要求,从而为耕地质量等别判断与划分提供重要依据。
This paper mainly explored the application of high frequency infrared carbon sulfur instrument to the determination of soil organic matter content in cultivated land quality investigation,and optimized the addition of high-purity iron and high-purity tungsten particle flux by controlling the symmetrical sample amount of variable method.The optimized measurement conditions were as follows:the sample weight was 0.05 g,and the addition of high-purity iron and high-purity tungsten particles was 0.40 g and 1.50 g,respectively.Under the best test conditions,the detection limit of this method was 0.028%,the relative standard deviation(RSD)was less than 5%,and the deviation between the measured value and the certified value of the reference material was within the allowable deviation range.By applying this method to soil organic matter analysis of cultivated land quality investigation sites in Dongzhi District of Anhui Province,the determination results were highly consistent with the results of potassium dichromate volumetric method and inter laboratory comparison,which showed that the detection limit,accuracy and precision of this method met the requirements of organic matter detection of cultivated land soil samples,thus providing an important basis for judging and dividing cultivated land quality.
作者
唐娟
严妍
TANG Juan;YAN Yan(East China Institute of Metallurgical Geological Exploration,Hefei,Anhui 230088)
出处
《安徽农业科学》
CAS
2022年第20期170-173,共4页
Journal of Anhui Agricultural Sciences
关键词
高频红外碳硫仪
土壤有机质
含量测定
耕地质量调查
控制变量法
助熔剂
High frequency infrared carbon sulfur instrument
Soil organic matter
Content determination
Cultivated land quality survey
Control variable method
Flux
