CAJ | 학술논문

建立用HNO_3-H_2O_2-HF体系微波消解前处理样品,利用电感耦合等离子体质谱测定土壤中铅同住素比值的方法,探讨并优化了影响测试结果的两种干扰因素.该方法中~(207)Pb/~(206)Pb和~(208)Pb/~(206)Pb的短期测量稳定性RSD分别达到0.12%和0.13%,长期测量的偏差分别在0.002和0.01以内,样品测量的最佳范围是10～40μg/L.采用标样-样品交叉法测定了湖南、湖北、云南、贵州、河南、福建、辽宁7个省的48个地区土壤中的铅同位素比值,结合聚类分析和主成分分析比较了各省土壤中同位素分布的差异,初步探讨了利用~(207)Pb/~(206)Pb和~(208)Pb/~(206)Pb比较烟叶产区的可能性.
건립용HNO_3-H_2O_2-HF체계미파소해전처리양품,이용전감우합등리자체질보측정토양중연동주소비치적방법,탐토병우화료영향측시결과적량충간우인소.해방법중~(207)Pb/~(206)Pb화~(208)Pb/~(206)Pb적단기측량은정성RSD분별체도0.12%화0.13%,장기측량적편차분별재0.002화0.01이내,양품측량적최가범위시10～40μg/L.채용표양-양품교차법측정료호남、호북、운남、귀주、하남、복건、료녕7개성적48개지구토양중적연동위소비치,결합취류분석화주성분분석비교료각성토양중동위소분포적차이,초보탐토료이용~(207)Pb/~(206)Pb화~(208)Pb/~(206)Pb비교연협산구적가능성.
A method for the determination of lead isotope ratios in soil by inductively coupled plasma mass spectrome-try (ICP-MS) with HNO_3-H_2O_2-HF used for microwave digestion of samples has been developed. Effects of the two main factors on the determination results were studied. The relative standard deviations of ~(207)Pb/~(206)Pb and ~(208)Pb/~(206)Pb for short-term measurements were 0.12% and 0.13%. The absolute deviations of ~(207)Pb/~(206)Pb and ~(208)Pb/~(206)Pb for long-term measurement were less than 0.02 and 0.01, respectively. The optimal concentration determination range through-out this work was 10～40 μg/L. The Pb isotope ratios in soil from 48 areas in 7 provinces containing Hunan, Hubei, Yunnan, Guizhou, Henan, Fujian and Liaoning were determined with standard-sample-bracketing method. Cluster analysis and one-way ANOVA analysis were applied to comparing the differentiation of lead isotope ratios in soil from different provinces. The possibility of using ~(207)Pb/~(206)Pb and ~(208)Pb/~(206)Pb in soil to compare the tobacco product regions was also discussed.