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Advisor(s)
Abstract(s)
A flow injection multisite detection system was
developed for correction of the sample blank in a
colorimetric determination. By using detector
relocation, a single spectrophotometer is used for
the sequential reading of the sample blank and of
the colored product; the sample crosses the flow
cell to measure intrinsic absorption, the color
reagent is subsequently added, and the flow cell is
relocated to provide the reading of the resulting
plug. The subsequent detector relocation
immediately after peak maximum increases the
determination frequency. This strategy was tested
in the colorimetric determination of iron in soil
samples based on the reaction of Fe (II) with
1,10-phenanthroline after reduction of Fe (III) to
Fe (II) by ascorbic acid. The results obtained for 15
soil extracts were in good agreement with those
obtained by the reference procedure. Relative
standard deviations better than 4% were obtained,
with a sampling rate of 30/h.
Description
Keywords
Citation
"Journal of AOAC International" . ISSN 1060-3271. 88:5 (2005) 1511-1515