Anal. Chem. 1997, 69, 3754-3759
Determination of Boron in Silicate Samples by Direct Aspiration of Sample HF Solutions into ICPMS Akio Makishima,* Eizo Nakamura,* and Toshio Nakano
The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Study of the Earth’s Interior, Okayama University at Misasa, Misasa, Tottori-ken 682-01, Japan
A rapid and precise technique for the determination of boron content in silicate rocks was developed by employing isotope dilution inductively coupled plasma mass spectrometry with a flow injection system (FI-ID-ICPMS). The sample was decomposed with HF and mannitol, dried to remove silicon as gas, and redissolved with HF to extract boron from the fluoride residue. Ultimately, the HF solution was directly aspirated into the ICPMS. The total procedural blank was 0.08-0.36 ng. No matrixinduced mass discrimination was observed in the rock solution for dilution factors of up to 110. The present method is capable of determining 1 µg g-1 boron in a 1 mg silicate rock sample with blank correction of
