[Determination of se in blood and tissue of animal samples by normal ICP-MS and ICP-MS with octupole reaction system].

The Se in the blood and tissue of animal samples was determined by ICP-MS instrument. The method was not only proved simple and rapid, but also showed satisfying precision and low detection limit. The optimum conditions of ICP-MS for the method were investigated. Results by the digestion method, the isotopes selection, and the difference between the normal ICP-MS without ORS (Octopole Reaction System) and the ICP-MS with ORS were compared, which afford reference to the determination of the same kinds of sample. The standard materials were determined to proved the reliability of the normal ICP-MS and the ORS-ICP-MS methods. The ORS-ICP-MS can effectively remove the interference based on polyatomic ions, so the the detection limits were lowed, and the accuracy was improved. The detection limits of the method for normal ICP-MS is 0.024 ng x g(-1) and that for ORS-ICP-MS is 0.004 6 ng x g(-1), the RSDs are between 1.8% and 5.5%, and the recoveries of the method are in the range of 90.8%-107.2%.