Analytical Sciences

Minimization of Sample Volume with Air-segmented Sample Injection and the Simultaneous Determination of Trace Elements by ICP-MS

Osamu NOGUCHI,*^,** Mitsuko OSHIMA,* and Shoji MOTOMIZU*

*Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushimanaka, Okayama 700-8530, Japan
**Criminal Investigation Laboratory, Okayama Prefectural Police H.Q., 1-3-2 Tonda, Okayama 700-0816, Japan

The application of inductively coupled plasma mass spectrometry (ICP-MS) to forensic chemistry was studied. The developed method, air-segmented sample injection (ASSI) coupled with ICP-MS, allowed the determination of about 25 elements at the sub-ppb level with only 0.2 ml of a sample solution. The optimum sample flow rate was found to be 0.4 ml min^-1, along with a sample suction time of 30 s. The proposed method was validated by determining trace elements in river-water certified reference material (SLRS-4) issued by National Research Council Canada. The analytical results of the proposed method were in good agreement with the certified values. This method was successfully applied to a human hair sample, the volume of which was 3 ml.

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