This work exploits a multi-syringe injection analysis (MSFIA) system coupled with a long liquid waveg-uide capillary cell for the spectrophotometric determination of zinc and copper in waters. A liquid
waveguide capillary cell (1.0m pathlength, 550mi.d. and250L internal volume)was used to enhance
the sensitivity of the detection. The determination for both ions is based on a colorimetric reaction with
zincon at different pH values. The developed methodology compares favourably with other previously
described procedures, as it allows to reach low detection limits for both cations (LODs of 0.1 and 2gL−1
,
for copper and zinc, respectively), without the need for any pre-concentration step. The system also pro-vided a linear response up to 100gL−1
with a high throughput (43h−1
) and low reagent consumption
and effluent production. The developed work was applied to natural waters and three certified reference
water samples.
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