摘要
该文以玻璃标准参考物质NIST SRM 612为样本,选择轻、中、重质量元素Li(7)、Cu(63)、Y(89)、Cs(140)、Ru(175)、Th(232)、U(238)为研究对象,探讨了氩气和氦气分别作为激光剥蚀-电感耦合等离子体质谱(LA-ICP-MS)中剥蚀池载气时对质谱分析信号的影响。结果显示:当激光剥蚀池载气为氩气时,载气流量为0.80 L/min,补偿气流量为0.70 L/min或者补偿气流量为0.85 L/min,载气流量为0.70L/min时获得最佳分析信号,信号值稳定(RSD为4%),氧化物离子干扰值小(UO/U为0.27%)。当激光剥蚀池载气为氦气时,补偿气氩气流量为0.95 L/min,载气氦气流量为0.95 L/min时获得最佳的信号强度值,且信号值稳定(RSD为4%,UO/U为0.32%)。对比发现,氦气作为激光剥蚀池载气时质谱分析信号强度明显高于氩气作为载气时的最佳分析信号强度值,各元素的信号强度值平均增强3倍,且背景值低。因此采用氦气作为激光剥蚀池载气,可显著提高分析灵敏度。
This study explores effects of different ablation - cell gases on the signal sensitivity and sta- bility of elements in solid microanalysis by Laser ablation inductively coupled plasma mass spectrome- try technique, by using NIST SRM 612 as a reference sample, and chosing the low, moderate and high mass elements such as Li（7）, Cu（63）, Y（89）, Cs（140）, Ru（175）, Th（232）, U（238） as research subjects. The results showed that there were good sensitivity and signal stability when u- sing argon as ablation - cell gas under 0. 85 L/min of argon and 0. 70 L/min of carrier gas. The rela- tive standard deviations （RSDs） were under 4% and the oxide formations （UO/U） were 0. 27%. When using helium as ablation - cell gas, good sensitivity and signal stability were obtained at 0. 95 L/min of argon as make up gas and 0. 95 L/min of helium as carrier gas. The RSI）s were about 4% and the oxide formations （UO/U） were 0. 32%. The signals increased three times and the back- ground values were very low when using helium as ablation - cell gas in comparison with using argon, and the detection limits ＇of method were markedly improved. Therefore, helium is recommended as ablation - cell gas of the laser ablation - ICP - MS.
出处
《分析测试学报》
CAS
CSCD
北大核心
2013年第2期233-238,共6页
Journal of Instrumental Analysis
基金
科技部国际科技合作与交流专项资助项目(2011DFB91710)
关键词
激光剥蚀-电感耦合等离子体质谱
激光剥蚀池
载气
laser ablation- inductively coupled plasma mass spectrometry
ablation -cell
carrier gas
