SMT法插标分析沉积物中磷的地球化学形态

SMT法是一种较为通用的沉积物磷地球化学形态分析方法,但分析结果的准确性和重现性成为制约其进一步应用的关键.本研究以我国沉积物标准样品GSD-12为标样,在详细研究该标样的SMT法提取的磷的各个地球化学形态含量的基础上,提出了插标法控制沉积物中磷地球化学形态的准确性和可比性.在对比了手工分析,Skalar仪器分析及ICP-MS仪器分析的结果之后,针对SMT法操作中存在的问题进行了探讨,提出了操作过程中的注意事项,提出了GSD-12中总磷(TP)、无机磷(IP)、有机磷(OP)、盐酸提取磷(HCl-P)和氢氧化钠提取磷(NaOH-P)等含量分别为(156±5),(77±2),(39±3),(41±2),(42±2)mg/kg,并将该标样用于太湖沉积物中磷形态测定的质量控制,取得了较为满意的结果.

SMT method for geochemical phosphorus fraction analysis in sediment by reference material inserting

The method for phosphorus speciation in sediment developed under the frame of Standard Measurements and Testing(SMT) Program of the European Commission is widely used,but it is hard to compare and evaluate the results of the analysis made by different operators.Phosphorus fraction in certified stream sediment reference material(GSD-12) was analyzed with the SMT method in this study.Owing to the accuracy and reproducibility of fractional phosphorus content in GSD-12 determined by SMT method,GSD-12 was suggested to be a reference material inserting in sediment phosphorus content analysis to fulfill the requirement of quality assurance and quality control during the measurement.Based on the comparison results from different phosphate analysis methods,and discussion of operational details in SMT procedure,the contents of TP,IP,OP,HCl-P and NaOH-P in GSD-12 were proposed as 156±5,77±2,39±3,41±2,42±2mg/kg,respectively.Phosphorus content in sediments from Lake Taihu was determined by GSD-12inserting using SMT method and showed satisfied results.Using reference materials inserting is helpful for making the results from SMT method more comparable.