2017 Volume 66 Issue 3 Pages 181-187
Online solid phase extraction ICP-MS is superior to simple ICP-MS in the enhancement of the target signal. However, the elution of the matrix material, which is pre-concentrated with target elements on the column, can lead to a decrease in the signal intensity of the target elements due to the introduction of large amounts of matrix material into the plasma. To overcome this problem, the internal standard-corrected signal integration method was developed. The proposed method was conducted in such a way that the chromatogram-like concentrated elution peak and the continuous stable internal standard peak can be simultaneously observed, and the ratio of the signal intensities was integrated during measurement time. In this study, the proposed method was applied to the analysis of radioactive strontium (90Sr). When the apparent recovery percentage in the actual quantification exhibited 87 % without the use of the presented method, the recovery increased to 103 % by using the presented method. In addition, the quantification with the proposed system exhibited good repeatability, ranging from 5.2 to 12.6 % for ultra-trace amounts of radioactive strontium {0.4–2.0 ppq (equal to 2–10 Bq L−1)}.
