氩气氛围电感耦合等离子体质谱分析性能的初步研究和应用

采用自制的氩气氛围电感耦合等离子体(ICP)离子源封闭装置,使ICP离子源与空气隔离,形成氩气氛围ICP离子源,研究了溶液雾化进样和激光剥蚀进样情况下电感耦合等离子体质谱(ICP-MS)的分析性能,证实氩气氛围ICP-MS在改善O、N、C、Ar等组成的多原子离子干扰方面具有明显的优势。在溶液进样的情况下,研究了¹¹B、²⁴Mg、²⁸Si、⁴²Ca、⁵³Cr、⁵⁴Fe、⁵⁵Mn、⁶⁰Ni、⁶⁵Cu、⁸⁹Y、¹¹⁵In、¹³⁷Ba、²⁰²Hg、²⁰⁸Pb等的线性相关系数、检出限和背景等效浓度,结果表明,对易受N、C、Ar等组成的多原子离子干扰的²⁴Mg、²⁸Si、⁴²Ca、⁵³Cr、⁵⁴Fe、⁵⁵Mn、⁶⁰Ni、⁶⁵Cu,其分析性能得到明显改善;对¹¹B、⁸⁹Y、¹¹⁵In、¹³⁷Ba、²⁰²Hg、²⁰⁸Pb等同位素没有负面影响。在激光剥蚀的情况下,紫铜中³¹P、⁵⁴Fe、⁵⁶Fe、⁶⁰Ni、⁶⁶Zn、¹⁰⁷Ag、¹²¹Sb、²⁰⁸Pb、²⁰⁹Bi等的分析性能都有所改善,尤其以⁵⁴Fe、⁵⁶Fe的改善更为明显。利用该技术,采用激光剥蚀ICP-MS测定了纯铜样品中P、Fe、Ni、Zn、Ag、Sb、Pb 和Bi等元素,测定结果与溶液雾化进样ICP-MS(SN-ICP-MS)基本吻合,各元素的检出限分别为6、24、3、1、1、1、1和0.01 μg/g。

Preliminary study and application on inductively coupled plasma mass spectrometry with ambient argon surrounding ion source

A technique of ICP-MS with ambient argon surrounding ion source was developed with a home-made enclosed device filled argon gas, and indicated its advantages for determination of these elements suffered from polyatomic interferences from of oxygen, nitrogen, carbon, and argon under solution nebulization (SN) and laser ablation (LA) sampling. Linear correlation coefficient, detection limit (DL), background equivalent concentration (BEC) of ¹¹B, ²⁴Mg, ²⁸Si, ⁴²Ca, ⁵³Cr, ⁵⁴Fe, ⁵⁵Mn, ⁶⁰Ni, ⁶⁵Cu, ⁸⁹Y, ¹¹⁵In, ¹³⁷Ba, ²⁰²Hg and ²⁰⁸Pb were researched with solution nebulization, these results demonstrated that analytical performances of ²⁴Mg, ²⁸Si, ⁴²Ca, ⁵³Cr, ⁵⁴Fe, ⁵⁵Mn, ⁶⁰Ni and ⁶⁵Cu suffered from polyatomic interferences from of nitrogen, carbon, and argon were obviously improved, and there were no negative effects to that of ¹¹B, ⁸⁹Y, ¹¹⁵In, ¹³⁷Ba, ²⁰²Hg and ²⁰⁸Pb. The calibration curves of ³¹P, ⁵⁴Fe, ⁵⁶Fe, ⁶⁰Ni, ⁶⁶Zn, ¹⁰⁷Ag, ¹²¹Sb, ²⁰⁸Pb and ²⁰⁹Bi in pure copper with laser ablation introduction were fitted, and their analytical performances became better, especially to ⁵⁴Fe and ⁵⁶Fe. P, Fe, Ni, Zn, Ag, Sb, Pb and Bi in pure copper samples were analyzed with this technique, the found levels coincided with the results by SN-ICP-MS, the DL of each element was 6, 24, 3, 1, 1, 1, 1 and 0.01 μg/g.