Determination of Hg (II) ions in aqueous solutions by solid phase extraction


Öter Ç.

4th International Conference on Data Science and Applications (ICONDATA), Yalova, Turkey, 4 - 06 July 2021, pp.121-125

  • Publication Type: Conference Paper / Full Text
  • City: Yalova
  • Country: Turkey
  • Page Numbers: pp.121-125

Abstract

Mercury in natural waters is generally found in the form of Hg (II) and MeHg (I) ions. Hg (II) ions are less toxic than MeHg (I). Organo-mercury compounds such as MeHg (I) accumulate in living things and show carcinogenic effects due to the chemical affinity of mercury to sulfanyl groups in biological molecules. These compounds accumulate especially in seafood and can reach humans through diet. Therefore, the correct determination of these two ions is important.

Due to their low concentrations, highly sensitive, accurate and fast methods are needed for the determination of these ions. In the case of liquid samples, the most used sample pretreatment is analyte extraction using solid phase extraction (SPE) to achieve the required low limits of detection. Solid phase extraction (SPE) is a preconcentration or separation technique used in the analysis of complex matrices or low concentration analytes. This method enables rapid sample preparation by filling in disposable columns with the help of various substances acting as adsorbents to separate liquid samples from undesirable components. It is much cheaper, faster and with less solvent than liquid-liquid extraction. It also increases the efficiency of the analysis, provides clean extract and provides high recovery rates.

In this study, rice particles were used as solid phase in SPE method. Solutions of Hg (II) at a given concentration were passed through the conditioned solid phase. After all the steps of the solid phase extraction were completed, Hg (II) ions were obtained from the solid phase surface with the help of a suitable solvent. The same procedures were repeated for the commercial C18-SPE cartridge. As result of the extraction processes, % recovery values of Hg (II) ions were determined at 532 nm using a UV spectrometer.