农田土壤中的重金属含量测定及其不确定度评估  

Determination of Pb,Cr,Cu and Zn in Farmland Soil and Assessment of the Uncertainty of Analytical Results

作　　者：杨新周[1] 张公信[1] 李学森[1] 穆怀雪[1] 姚福泉[1] 胡秋芬[1] 

机构地区：[1]云南民族大学民族药资源化学国家民委-教育部重点实验室,云南昆明650031

出　　处：《云南民族大学学报（自然科学版）》2012年第2期101-103,106,共4页Journal of Yunnan Minzu University:Natural Sciences Edition

基　　金：国家自然科学基金(20961012)

摘　　要：利用微波消解-火焰原子吸收光谱法测定农田土壤中的铅、铬、铜和锌含量,并对测量结果不确定度来源进行了分析,分析得知不确定度来源主要包括样品的称量,重复性测量,标准溶液的配制,曲线拟合,样品的定容.通过建立数学模型计算出各不确定度分量,总结出标准物质不确定度,重复性测量不确定度占较大比例,并提出了减小不确定度的建议.The method of Microwave Digestion and Flame Atomic Absorption Spectrometry for the determination of the trace amount of Pb, Cr, Cu and Zn in farmland soil was established, and the uncertainty sources of the meas- urement results were analyzed. According to the analytical results, the uncertainty sources include the samples size, the repeatability of measurement, the preparation of standard liquid, the carve fitting, and the sample volume. These components of uncertainty were calculated by the mathematical mode. The results showed that the uncertainty of standard substance and the repeatability of measurement were the main source. Some suggestions for reducing the uncertainty were also given.

关 键 词：微波消解 火焰原子吸收光谱法 土壤 不确定度 

分 类 号：O657.31[理学—分析化学]