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Abstract
Flow injection analysis (FIA) involving the on-line oxidation of organomercury species to Hg2+, followed by reduction to Hg0 with acidified tin(II)chloride has been successfully coupled to an atomic fluorescence spectrophotometer (AFS) for determination of total organomercury in environmental samples. The method gave accurate and reproducible results for the certified dogfish samples DORM-1 and DOLT-1. A suitable organomercury extraction procedure for use with the method was established. The FIA-AFS method may also be used for determination of total mercury in environmental samples. The limit of detection (LOD) for organomercury was 200 pg and 2 pg for inorganic mercury using a 100 μ1 injection. The system is dedicated, cost-effective, sensitive and simple to use with a throughput of 17 analyses per hour.
