流动注射在线标准加入法同时测定粮食中微量金属元素

Determination of Micro-Elements in Grains by Flow-Injection Microwave Plasma Torch Atomic Emission Spectrometer Simultaneously with on-line Standard Addition

本文采用MPT全谱仪,建立了流动注射微波等离子体炬原子发射在线标准加入法同时测定粮食中Ca、Cu、Fe、Mg、Mn的新方法。在选定的条件下,方法对Ca、Cu、Fe、Mg、Mn的检出限分别为3.9、18、31、6.4和69ng/mL。相对标准偏差小于5.5%。回收率在97%～108.0%之间。本法用于美国标准物质(1567,1568)的分析,测得值与标准参考值完全吻合。

An on-line standard addition method for simultaneous determination of Ca, Cu, Fe, Mg and Mn in grains by FI-MPT-AES was established in this paper. Three different smple pretreatment methods were compared. Under optimized conditions, the samples of American Standard Material (1567, 1568) were analyzed, and the results obtained were in good agreement with the certified values. The detection limits for Ca, Cu, Fe, Mg and Mn were shown to be 3.9, 18,31, 6.4 and 69 ng/ mL, respectively, and RSDs were all less than 5.5 %. The recoveries were shown to be in the range of 95.5%~114.1%.