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Advisor(s)
Abstract(s)
A single-channel flow injection system was optimized for the determination
of available iron (Fe) in soil extracts by atomic absorption spectrophotometry.
This method of introducing the samples in the spectrophotometer worked
particularly well in preventing blockage of the burner head which was
observed in the conventional introduction of Fe for its determination by atomic
absorption spectrophotometry. The appropriate selection of the manifold
parameters, such as injection volume, tube length and flow rate, allowed
introduction of any soil extract without requiring any pre-treatment. This
system allowed determinations at a detection limit of 0.36 mg L-1 to 5 mg L-1,
with an output of 300 determinations per hour. The results obtained for
analysis of 15 soil extracts were in good agreement with those provided by
the colorimetric method, with average relative deviations of 1.6%. Relative
standard deviations of 4.8, 2.5, and 2.3% were obtained for contents of 1.03,
1.85, and 3.99 mg Fe L-1, respectively.
Description
Keywords
Pedagogical Context
Citation
FERREIRA, M. R. Alexandra; RANGEL, António O. S.S.; LIMA, José L. F. C. - Determination of iron in soils by flow injection atomic absorption spectrometry. Communications in Soil Science and Plant Analysis. ISSN 0010-3624. nº15-16. p.2407-2414
Publisher
Taylor & Francis