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Suppression of Matrix Effects in ICP‐MS by High Power Operation of ICP: Application to Precise Determination of Rb, Sr, Y, Cs, Ba, REE, Pb, Th and U at ng g ‐1 Levels in Milligram Silicate Samples
Author(s) -
Makishima Akio,
Nakamura Eizo
Publication year - 1997
Publication title -
geostandards newsletter
Language(s) - English
Resource type - Journals
eISSN - 1751-908X
pISSN - 0150-5505
DOI - 10.1111/j.1751-908x.1997.tb00678.x
Subject(s) - matrix (chemical analysis) , inductively coupled plasma mass spectrometry , analytical chemistry (journal) , detection limit , chemistry , trace element , dilution , mineralogy , chromatography , physics , mass spectrometry , organic chemistry , thermodynamics
We found that the suppression of signals for 88 Sr, 140 Ce and 238 U in rock solution caused by rock matrix in ICP‐MS (matrix effects) was reduced at high power operation (1.7 kW) of the ICP. To make the signal suppression by the matrix negligible, minimum dilution factors (DF) of the rock solution for Sr, Ce and U were 600, 400 and 113 at 1.1, 1.4 and 1.7 kW, respectively. Based on these findings, a rapid and precise determination method for Rb, Sr, Y, Cs, Ba, REE, Pb, Th and U using FI (flow injection)‐ICP‐MS was developed. The amount of the sample solution required for FI‐ICP‐MS was 0.2 ml, so that 1.8 mg sample was sufficient for analysis with a detection limit of several ng g ‐1 . Using this method, we determined the trace element concentrations in the USGS rock reference materials, DTS‐1, PCC‐1, BCR‐1 and AGV‐1, and the GSJ rock reference materials, JP‐1, JB‐1, ‐2, ‐3, JA‐1, ‐2 and ‐3. The reproducibilities (RSD %) in replicate analyses (n=5) of BCR‐1, AGV‐1, JB‐1, ‐2, ‐3, JA‐1, ‐2, and ‐3 were < 6 %, and typically 2.5%. The difference between the average concentrations of this study for BCR‐1 and those of the reference values were < 2%. Therefore, it was concluded that the method can give reliable data for trace elements in silicate rocks.