Multi-isotope calibration for determination of nickel, molybdenum, barium and lead in soil samples by inductively coupled plasma mass spectrometry

Abstract

The multi-isotope calibration is a fast and accurate calibration strategy for multi-elemental determination that uses only two solutions, (1) 50% (v v⁻¹) sample plus 50% (v v⁻¹) analytical blank solution, and (2) 50% (v v⁻¹) sample plus 50% (v v⁻¹) standard solution (containing the analytes). The concentration of the analytes was calculated from the slope and the concentrations of the standards were added to solution 2. The validation of the method was evaluated using five standard reference materials of soils. The conventional internal standardization was also evaluated for comparative purpose. Low limits of quantifications and good linearity for calibration curves were achieved for all the evaluated elements. The values were 0.022, 0.026, 0.019, and 0.017 µg L⁻¹ for Ni, Mo, Ba, and Pb, respectively.

Keywords:

• Inductively coupled plasma mass spectrometry
• multi-isotope calibration
• soil

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

We gratefully acknowledge the Health Commission of Jiangxi Province [No. 20202027] and Science and Technology department of Jiangxi Province [No. 20192BBG70008 and 20203BBGL73211] for financial support of this work.