Use of a single calibration graph for the determination of major elements in geological materials by laser ablation inductively coupled plasma atomic emission spectrometry with added internal standards |
| |
Authors: | V Kanicky and Jean-Michel Mermet |
| |
Institution: | (1) Laboratory of Plasma Sources for Chemical Analysis, Faculty of Sciences, Masaryk University, CZ 61137 Brno, Czech Republic, XX;(2) Laboratoire des Sciences Analytiques (CNRS UMR 5619), Université Claude Bernard-Lyon I, F-69622 Villeurbanne, Cedex, France, FR |
| |
Abstract: | The possibility of internal standardisation in laser ablation inductively coupled plasma atomic emission spectrometry (LA-ICP-AES)
of geological materials by added Sc2O3 and Y2O3 has been examined to cover the wide range of concentrations of major and minor constituents both in silicate rocks and limestones.
A Nd : YAG laser (355 nm, 10 Hz, 10 mJ per shot) was used for the ablation of discs obtained by fusion of the mixture of samples
and oxides of Sc and Y with lithium tetraborate. The flux/sample ratio was in the range from 6 to 10. The contents of analytes
were within the concentration range from hundredths to tens of percentage. The trace elements copper and nickel were studied,
too. An ICP emission spectrometer OPTIMA 3000 DV was used for the measurement of Si, Al, Ca, Mg, Sr, Ba, Fe, Ti, Mn, Ni, Cu,
Na and K analyte lines and Y and Sc reference lines in the axial observation mode. The long-term and the short-term repeatability
of measurement were improved by employing scandium or yttrium internal references lines for the above analytes from 6% to
1.5% of RSD and from 2.4% to 1.0% of RSD, respectively. The correlation of signals with concentrations was improved in terms
of the correlation coefficient r from 0.90–0.97 to 0.98–0.998 and the relative uncertainity on the centroid of concentrations was improved 2–3 times. A single
calibration graph covering the concentration range both in silicates and carbonates is possible for each of elements, as the
matrix effects are compensated for by internal standards and the excess of Li2B4O7.
Received: 20 June 1998 / Revised: 20 July 1998 / Accepted: 21 September 1998 |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|