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Use of contained and added internal standards has been compared in laser ablation ICP-AES of silicate rocks and limestones to improve both precision and accuracy. Glass disks obtained by fusion of rocks
with lithium tetraborate were sampled by means of a Q-switched Nd:YAG laser (355 nm, 10 Hz, 10 mJ per shot) and analyzed with an ICP emission spectrometer equipped with a segmented charge-coupled device
detector. The Si and Ca major elements of the silicate and limestone samples, respectively, were compared with the Li and B flux elements for internal standardization. A 2- to 5-times improvement in the
percent relative standard deviation (%RSD) of the repeatability was found, irrespective of the internal standard, leading to a repeatability in the 1-2% RSD range. On the basis of the use of Li and B as
internal standards, linear calibration graphs were obtained for Si, Al, Ca, Mg, Fe, Ti, Na, and K by using reference geological materials. The possibility of using flux elements overcomes the need to have
prior knowledge of the concentration when a contained element is being used as an internal standard.
The Society publishes the internationally recognized, peer reviewed journal, Applied Spectroscopy, which is available both in print and online. Subscriptions are included with membership or can be purchased by institutional or corporate organizations. Abstracts may be viewed free of charge. Previously published as Bulletin (Society for Applied Spectroscopy)