Developing an analytical method for mercury speciation in natural waters
Abstract
In this research, an analytical method was developed to extract total, organic and inorganic mercury from natural waters by Solid- Phase Extraction using modified and activated silica gel as solid phases, and the concentrations of each were determined using cold vapor technique (Cold Vapor Atomic Absorption Spectrometry: CV-AAS). The silica gel was modified using ammonium pyrrolidine dithiocarbamate (APDC), while the silica gel was activated using chloroform. The extraction process was studied within the range (pH: 2-10), while the recovery process for total, organic and inorganic mercury from the surface of silica gel was studied within the concentration range (1-7 M) for nitric acid. As for method validation, this was done by comparing the results obtained with the results of reference methods. The results showed that the percentage of extraction of inorganic mercury using activated silica gel reached (97.3%) at (pH = 4), while the percentage of extraction of organic mercury using modified silica gel reached (99.3%) at (pH = 3). As for total mercury, it was Its extraction rate is (99.6%) at (pH=3). Regarding recovery, the highest percentage was at the concentration of nitric acid (6 M) for total, organic and inorganic mercury, with pre-concentration factor (100). The capacity of activated silica gel and modified silica gel are (628.44 µg/g), (1022.04 µg/g) respectively. Finally, the method detection limit of the new method was (0.12 ng/l).
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