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Development of an FIA system with amperometric detection for determination of bentazone in estuarine waters
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Advisor(s)
Abstract(s)
On the basis of its electrochemical behaviour a
new flow-injection analysis (FIA) method with amperometric
detection has been developed for quantification of
the herbicide bentazone (BTZ) in estuarine waters. Standard
solutions and samples (200 µL) were injected into a
water carrier stream and both pH and ionic strength were
automatically adjusted inside the manifold. Optimization
of critical FIA conditions indicated that the best analytical
results were obtained at an oxidation potential of 1.10 V,
pH 4.5, and an overall flow-rate of 2.4 mL min–1. Analysis
of real samples was performed by means of calibration
curves over the concentration range 2.5x10–6 to
5.0x10–5 mol L–1, and results were compared with those
obtained by use of an independent method (HPLC). The
accuracy of the amperometric determinations was ascertained;
errors relative to the comparison method were below
4% and sampling rates were approximately 100 samples
h–1. The repeatability of the proposed method was
calculated by assessing the relative standard deviation (%)
of ten consecutive determinations of one sample; the value
obtained was 2.1%.
Description
Keywords
Amperometry Bentazone FIA system Herbicides Estuarine waters
Citation
Publisher
Springer-Verlag