The Agilent 7500ce ICP-MS is shown to be an excellent analytical tool for the elemental analysis of gasoline. It offers the best detection limits of any multi-element tech- nique and a full elemental analysis suite that takes less than 5 minutes to acquire. The Octopole Reaction System (ORS), integral to the 7500ce, ensures that a single method and set of conditions can be used to directly determine all elements of interest in the sample. Comparison data for selected elements in both gas mode and no-gas mode highlight the effectiveness of the ORS for interference removal. Results showing the excellent long-term stability of the 7500ce ORS are also given.
The document describes the use of the Agilent 7500ce ICP-MS equipped with the Octopole Reaction System (ORS) for the direct analysis of gasoline. It addresses challenges such as high vapor pressure and carbon deposition by utilizing a cooled spray chamber, a narrow bore torch injector, and oxygen addition to the plasma.
The note details the operating conditions, including forward power, gas flows, and the use of platinum interface cones. It explains the application of different ORS modes (Helium, Hydrogen, and No-gas) to remove specific polyatomic interferences and presents calibration data and detection limits for elements like Magnesium, Chromium, Cadmium, and Barium in gasoline samples.
| Forward power | 1200 W |
|---|---|
| Plasma gas flow | 15.0 L min |
| Auxiliary gas flow | 1.0 L min |
| Nebulizer gas flow | 0.70 L min |
| Make up gas flow | 0.13 L min |
| Sampling depth | 9.0 mm |
Data is acquired operating the ORS in helium mode, hydrogen mode, and no-gas mode.
A slightly higher hydrogen flow rate is used for the removal of C interference on Mg.
Oxygen is introduced to eliminate the effects of carbon deposition on the interface and ion lenses.