Abstract
A simple non-chromatographic method for the determination of mercury (Hg 2+), methylmercury (MeHg +), dimethylmercury (Me 2Hg), and phenylmercury (PhHg +) employing atomic fluorescence spectrometry (AFS) as detection technique was developed. Mercury species showed a particular behavior in the presence of several reagents. In a first stage SnCl 2 was employed for Hg 2+ determination; in a second step, [Hg 2+ + PhHg +] concentration was determined using SnCl 2 and UV radiation. MeHg + decomposition was prevented adding 2-mercaptoethanol. In a third stage, [Hg 2+ + PhHg + + MeHg +] concentration was determined using K 2S 2O 8. Finally, the four species were determined employing NaBH 4. Reagents concentration and flow rates were optimized. The extraction technique of mercury species involved the use of 2-mercaptoethanol as ion-pair reagent. The limits of detection for Hg 2+, PhHg +, MeHg +, and Me 2Hg were 1, 40, 68, and 99 ng L −1 with a relative standard deviation of 1.5, 3.1, 4.7 and 5.8%, respectively. Calibration curve was linear with a correlation factor equal to 0.9995. The method was successfully applied to the determination of the mercury species in two Antarctic materials: IRMM 813 ( Adamussium colbecki) and MURST-ISS-A2 ( Antarctic Krill).
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