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A microextraction procedure for the speciation of very low concentrations (0.005–0.2µgL −1 ) of chromium is discussed. To the aqueous sample (10mL), diluted hydrochloric acid, sodium chloride and a small amount of tributylphosphate (80µL) are incorporated, and the mixture is submitted to ultrasounds for 10min. The organic phase recovered after centrifuging is injected into the electrothermal...
A procedure for the simultaneous determination of six organotin compounds, including methyl-, butyl- and phenyltins, in waters and marine sediments is developed. The analytes were leached from the solid samples into an acetic acid:methanol mixture by using an ultrasonic probe. The organotins were derivatized with sodium tetraethylborate (NaBEt 4 ) in the aqueous phase, stripped by a flow of...
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