FLOW-INJECTION FLAME ATOMIC-ABSORPTION SPECTROMETRY FOR SLURRY ATOMIZATION - DETERMINATION OF CALCIUM, MAGNESIUM, IRON, ZINC AND MANGANESE IN VEGETABLES
P. Vinas et al., FLOW-INJECTION FLAME ATOMIC-ABSORPTION SPECTROMETRY FOR SLURRY ATOMIZATION - DETERMINATION OF CALCIUM, MAGNESIUM, IRON, ZINC AND MANGANESE IN VEGETABLES, Analytica chimica acta, 283(1), 1993, pp. 393-400
A flame atomic absorption spectrometric procedure for determining the
iron, zinc, manganese. calcium and magnesium contents of slurries prep
ared from vegetables is described. Samples were first submitted to a m
ild calcination step and then suspensions were prepared and introduced
into an air-acetylene flame using a simple flow-injection manifold. T
he calibration for iron, zinc and manganese was carried out using eith
er aqueous standards or a flow-injection sample-to-standard additions
method applicable to suspensions. The calcium and magnesium contents w
ere too high for the direct introduction of the slurries into the flam
e and so an on-line dilution system was used. Excellent agreement was
found between the results of the slurry-based procedures and those obt
ained by an alternative method involving calcination and dissolution i
n acid. The reliability of the approach was confirmed by analysing two
certified reference materials.