Abstract
A gas-diffusion flow injection (GD-FI) system for the determination of Hg(II) in aqueous samples at trace levels is described. The analytical procedure involved injection of Hg(II) samples and standards into a 1.5 M H 2SO 4 stream which was subsequently merged with a reagent stream of 0.6% SnCl 2 in 1.5 M H 2SO 4 to reduce Hg(II) to metallic mercury. The gas-diffusion cell was thermostated at 85 °C to enhance the vaporization of mercury. The mercury vapour diffused across a Teflon membrane into an acceptor stream containing 0.050 M KNO 3 where it was detected amperometrically at a gold electrode set at +600 mV versus Ag/AgCl reference electrode. Under optimal conditions, the flow injection method is characterized by a linear calibration range between 0 and 80 μg l −1, a detection limit of 900 ng l −1 and a sampling rate of 12 samples per hour. The flow injection system was successfully applied to the determination of mercury in freshwater samples containing colored compounds and suspended particulates and to digested sediment and soil samples. Satisfactory agreement with results obtained by cold vapour atomic absorption spectrometry was observed.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
