Abstract
It is well known that molybdenum oxides affect Cd determination by inductively coupled plasma mass spectrometry (ICP-MS). It is proposed here a procedure for simultaneous determination of Cd and Mo. The effectiveness of the ICP-MS with tandem configuration (ICP-MS/MS) using octopole reaction system (ORS3) pressurized with oxygen gas and MS/MS mode to overcome Mo oxide-based interferences on Cd determination was evaluated. Cadmium was determined as free atom ion and Mo was determined as MoO2+ employing a 0.5mLmin−1 oxygen gas flow rate into the ORS3. Non-fat and whole milk powder certified reference materials (NIST SRM 8435 and SRM 1549) were used for checking the accuracy of the proposed procedure. The microwave-assisted digestion was carried out using diluted nitric acid solution (2.6molL−1 HNO3) and hydrogen peroxide (30%mm−1). According to Student's t-test, reference and determined values were in agreement at a 95% confidence level, except for 111Cd and 113Cd in SRM 1549.
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