| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1227713 | Microchemical Journal | 2015 | 5 Pages |
•ICP-MS/MS was used to overcome Mo-based interferences on Cd determinations.•Cd was determined by on mass mode while Mo by mass shift mode.•The MoO+ formed in the plasma was converted to MoO2+ ions into the ORS3.
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 0.5 mL min− 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 (2.6 mol L −1 HNO3) and hydrogen peroxide (30% m m −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.
