SMT法测定沉积物标准样品有机磷形态分析方法探究

摘要

At present,there is no available uniform sequential extraction of phosphorus in sediment,variation is tremendous from the different ways of characterizing the sequential extraction of phosphorus.SMT is widely used to analyzing the phosphorus in sediment,based on its simply operation and finely repetition,but process of the sequential extraction is complicated,especially extract the content of OP,inaccuracy is showed up because the samples are frequently transferred and the analyst are manually operating.An advanced method of extracting the content of OP was found after several experiments and research.To validating the improvement is feasible and rational,the research samples the GSD-9 and GSD-12 in sediment of the water system and the field sediment,at the same time,using standard SMT and the advanced method to measure the content of OP in sediment.The result showed that the standard SMT extract the content of OP,which containing 9.33％ and 23.03％ of TP,while the advanced method contains 10.44％ and 23.13％,there was no significant difference between the two methods.the results are highly similar,The results indicated that the advanced method is feasible,and has more directed meaning of extracting OP.%目前水体沉积物中磷的分级提取没有统一的方法,不同的提取方法分析沉积物中的磷形态结果可能会有很大差异.SMT法因操作简单、重复性好而被广泛应用于沉积物磷形态分析,但是在实际操作中连续提取过程比较复杂,尤其是有机磷(OP)提取步骤比较繁琐,中间转移过程较多,分析人员人为操作等因素都会导致实验出现较大误差,通过多次实验研究发现,在此基础上还存在另外一种改进的OP提取方法.为了验证改进法是否具有合理可行性,以水系沉积物标准样品GSD-9和GSD-12为标样,同时以野外采集的沉积物样品为实际样品,采用标准SMT法和改进法重复测定(n=30)沉积物中OP含量.结果表明:标准SMT法提取沉积物标准样品GSD-9和GSD-12测得的OP含量分别占其总磷(TP)含量的9.33％和23.03％；改进法测得的OP含量分别占其TP含量的10.44％和23.13％,两种OP提取方法测得结果有着极高的相似性.结果表明,改进的OP提取方法具有可行性,对于沉积物OP分析提取方法的合理选择具有指导意义.