The source of signal variations that governs the analytical performance of laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) was investigated in this study. In order to specify the source of signal variations of LA-ICPMS, laser-induced plasma (LIP) Fe emission, LA-ICP-MS Fe
+ and LA-ICP-MS Ni
+ signals were used as internal standards for the determination of trace elements in low-alloy steel certified reference materials (BS 50D and JSS 1005- 1008). Fe I 373.5 nm emission signals from LIP were measured, while trace element LA-ICP-MS signals were collected. After that, the LIP emission signals, LA-ICP-MS Fe
+ and LA-ICP-MS Ni
+ signals were used as internal standards, and the analytical performance was evaluated by the RSDs and the correlation coefficients (
r) of the calibration curves. The improvement factors were dependent on the internal standardization methods. Analytical precisions (RSDs) of trace element LA-ICP-MS signals were improved by factors of 1.5 - 3.3 using LIP Fe emission signals as an internal standard. The improvement factors of 2.5 - 5.9 and 4.1 - 17 were obtained by using LA-ICP-MS Fe
+ and LA-ICP-MS Ni
+ signals as internal standards, respectively. Better correlation coefficients (
r) were also obtained using the LA-ICP-MS signal compensation (0.9985 by LA-ICP-MS Fe
+ and 0.9996 by LA-ICP-MS Ni
+) rather than the LIP Fe emission compensation (0.9932). In this paper we compare and discuss the analytical performance achieved by LA-ICP-MS using LIP Fe emission, LA-ICP-MS Fe
+ and LA-ICP-MS Ni
+ signals as internal standards.
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