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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

Analysis of matrix effect in laser ablation inductively coupled plasma mass spectrometry for rhyolitic glass: Critical evaluation with new Aso-4 b-W synthetic glass blocks

Jun-Ichi Kimura, Qing Chang, Akira Furusawa
Geochemical Journal, Vol. 52, No. , P. 227-240, 2018

ABSTRACT

In this paper, we report the analytical results of a new synthetic rhyolitic glass block fabricated from purified glass shards of Aso-4 tephra by using both solution and laser ablation (LA) inductively coupled plasma mass spectrometry (ICP-MS). The Aso-4 b-W glass block is extremely homogeneous in 10 major and 32 trace elements with 1-standard deviation error (1SD), which is better than ~10% by LA-ICP-MS (n = 200). The Aso-4 b-W rhyolite glass was utilized to evaluate the matrix effect in LA-ICP-MS by using SRM 610 synthetic, GSE-1G basaltic andesite, and BHVO-2G basalt glasses as standards. The GSE-1G glass showed heterogeneity. Thus, the analytical results of Aso-4 b-W were normalized using BHVO-2G as the secondary standard. The major and trace element compositions were in good agreement within ~10% relative deviation (% RD) compared with those from electron probe micro analyzer and solution ICP-MS, respectively. However, the use of the SRM 610 standard showed a matrix bias of –24% RD in heavy rare earth elements, but these concentrations were in good agreement when renormalized to BHVO-2G. A matrix-matched glass standard is strongly recommended for precise analysis of rhyolitic glass. The Aso-4 b-W and the ATHO-G rhyolite glasses were analyzed using GSE-1G as the standard with BHVO-2G normalization. The results for both standard glasses were in good agreement with the reference values, thereby showing the importance of the matrix-matched standard. Moreover, this indicates that the new Aso-4 b-W glass block is suitable as a check standard in analyses of unknown rhyolitic glasses.

KEYWORDS

rhyolite glass, major element, trace element, LA-ICP-MS

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