Quantification of the Rubidium in Beverage Products Micro Samples by Platinum-wire Loop in Flame Atomization Atomic Emission Spectrometry.
The rubidium content in 3 µL of some beverage products (beer, wine, vegetable and fruit juices) atomized from a Ptwire in the methaneair flame has been determined by atomic emission spectrometry. The flame atomization conditions of rubidium were optimized, they are: λ = 780.0 nm, the height of 8 mm over the burner head, gas flow rates of 300 L h-1 air and 34 L h-1 methane. The effect of Na, K, Cs, Sr and acetone on the emission of rubidium was studied too. The limit of quantification (6σ) obtained is of 4.3±1.8 pg in the presence of 50 mg L-1 K and 5% v/v acetone (P = 0.05). The rubidium content of the samples has been determined with continuous nebulization and by atomization from the Ptwire, using the standard calibration curve and the standard addition method. The results of the two procedures agree within the determination errors.
Ladislau
L
Kékedy-Nagy
Andreea R
AR
Zsigmond
Emil A
EA
Cordoş