A method for the measurement of trace elements in malt spirits (whisky) is described with reference to six different samples.
The document details a method for measuring trace elements in malt spirits, specifically whisky, using an Agilent 7500cx ICP-MS equipped with the Octopole Reaction System (ORS). The study analyzed six different whisky samples to demonstrate the instrument's ability to remove interferences and achieve excellent spike recoveries (97-107%) and precision (<2%).
The analysis involved sample preparation using a 5x dilution with nitric and hydrochloric acid, followed by instrumental analysis using helium, hydrogen, and no-gas modes. The ORS in helium mode was found to effectively remove carbon-based and chloride-based interferences, such as those affecting Chromium and Vanadium. Hydrogen mode was utilized for Selenium analysis to improve detection limits at ultratrace levels. The study confirms the suitability of the 7500cx for routine quality control of trace metals in alcoholic beverages.
| RF power | 1550 W |
|---|---|
| Sampling depth | 8mm |
| Carrier gas flow | 0.68 L/min |
| Makeup gas flow | 0.33 L/min |
| Spray chamber temperature | 15°C |
| Helium cell gas flow | 5.5 mL/min |
| Hydrogen cell gas flow | 40 mL/min |
The Octopole Reaction System (ORS) collision/reaction cell is used to remove matrix-based polyatomic interferences.
The sample uptake rate is approximately 150 L/min.
Hydrogen mode is recommended for Selenium to improve detection limits at low ppt levels.