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A Simple Method for Precise Determination of 23 Trace Elements in Granitic Rocks by ICP‐MS after Lithium Tetraborate Fusion
Author(s) -
Awaji Shunsaku,
Nakamura Kentaro,
Nozaki Tatsuo,
Kato Yasuhiro
Publication year - 2006
Publication title -
resource geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.597
H-Index - 43
eISSN - 1751-3928
pISSN - 1344-1698
DOI - 10.1111/j.1751-3928.2006.tb00299.x
Subject(s) - granitic rock , geology , basalt , lithium (medication) , mineralogy , geochemistry , volcanic rock , alkali metal , chemistry , volcano , medicine , organic chemistry , endocrinology
Abstract. An improved alkali fusion method followed by HF‐HNO 3 ‐HC1O 4 treatment is performed for simultaneous determination of 23 trace elements (Sr, Y, Zr, Nb, Ba, Hf, Ta, Th, U, and REE) by ICP‐MS in rock reference materials: basaltic rocks (JB‐2, JB‐3) and granitic rocks (JG‐la, JG‐2, JG‐3). Our improved method offers several advantages including: (1) suppression of whitish precipitates probably composed of insoluble fluorides by addition of HCIO4, (2) simple and reliable preparation procedure, (3) instrument calibration which enables straightforward simultaneous multi‐elemental analysis, and (4) the very low background levels by using pure lithium tetraborate flux. We obtained the analytical results with a reproducibility of mostly <2 % (1s̀) for the basaltic rocks and <7 % for the granitic rocks. The higher relative standard deviation (RSD) values for granitic rocks may be attributed to sample heterogeneity of coarse‐grained granitic rocks. The analytical results of the granitic rocks demonstrate that Zr and Hf abundances are consistent with the compiled values and that REE concentrations agree well with recently published data, suggesting that the Li 2 B 4 O 7 fusion method applied in the present study is suitable for the analysis of the granitic rocks.