土壤有机质测定全程质量控制

质量控制是环境监测赖以生存和发展基础,加强全程质量控制才能确保监测数据的准确性和可靠性。结合环境监测工作实际,应用标准分析方法—重铬酸钾容量法《土壤检测第6部分:土壤有机质的测定》(NY/T 1121.6-2006)对土壤有机质测定进行了全程质量控制技术探讨。简介了方法所需仪器与试剂,深入探讨了运用标准法进行土壤中有机质测定全程质量控制技术问题。指出在标准分析方法基础上,选用有效期内质量合格分析纯以上试剂,全面规范样品采集与保存,有序开展样品制备与称取,严格管控消煮操作与滴定过程,准确进行分析结果数据处理,切实加强结果填报规定程式,能够确保大批量、成分复杂土壤样品有机质测定精密度和准确度。

Quality Control in the Whole-Course Determination of Organic Matter in Soil

Quality control is the basis for the survival and development of environmental monitoring, strengthening the whole-course quality control by which the accuracy and reliability of the monitoring data can be assured. Combined with the work practice of environmental monitoring, the application of the standard analytical method-Potassium dichromate volumetric method Soil testing - Part 6： Determination of soil organic matter （NY/T 1121.6-2006） were utilized to discuss the whole-course quality control method on the determination of soil organic matter. The required instruments and reagents in this method were briefly introduced, with the in-depth exploration of the whole-course quality control technical problems in the determination of soil organic matter by using the standard analytical method. This paper also indicated that on the basis of standard analytical method, selecting the within validity period, qualified, analytical and above reagents, normalizing the overall sample collection and preservation, preparing and weighing the sample orderly, regulating digestion operation and titration process strictly, processing the data of analysis results accurately, strengthening stipulated procedure of result filling-reporting effectively, by which could guarantee the accuracy and precision during the determination of organic matter from large batches of soil samples with complicated composition.