The Liberty Series II ICP-OES is used to directly analyze milk powder without sample preparation.
The document details a method for analyzing major, minor, and trace elements in milk powder directly without wet digestion or dry ashing. It addresses challenges such as ionization interferences caused by easily ionized elements (EIE) like sodium and potassium.
The study utilizes an Agilent Liberty Series II ICP-OES equipped with an axially-viewed plasma torch. The method employs standard aqueous calibration with scandium added as an internal standard to correct for viscosity effects. Additionally, the document investigates the use of caesium (Cs) as an ionization suppressant to improve accuracy when analyzing samples with high EIE concentrations.
Samples must be dried in an air oven for 4 hours at 85 °C.
Scandium is added to each solution with a final concentration of 0.5 mg/L.
The solutions were made up to the mark and placed in an ultrasonic bath for 5 minutes.