title: Selection of internal standards for analysis of silicate rocks and limestones by laser ablation inductively coupled plasma atomic emission spectrometry (LA-ICP-AES).
abstract: Included (Si, Ca) and added (Li, B) internal standards (IS) have been used comparatively in LA-ICP-AES of silicates and limestones to improve both precision and accuracy. A Q-switched Nd:YAG laser (355 nm, 10 Hz, 10 mJ per shot) has been applied for ablation. Samples have been prepared by fusion with Li(2)B(4)O(7) and measured using a Perkin-Elmer Optima 3000 ICP system. Both types of IS have given a relative standard deviation (RSD) less than 2-1%, which improved the repeatability by a factor of 2-10 and calibration graphs have been linear over the whole concentration range.
authors.affiliation: Department of Anal. Chemistry, Masaryk University, Kotlarska 2, CZ-61137, Brno, Czech Republic.
authors.forename: V
authors.initials: V
authors.lastname: Kanicky
authors.forename: J M
authors.initials: JM
authors.lastname: Mermet