The method development for elimination of matrix interferences in seawater monitoring to determine elements by ICP-MS.

A simple, versatile, and economical method development with matrix elimination to determine the elements As, Ba, Cd, Co, Cr, Cu, Mn, Ni, Pb, V, and Zn in seawater by using the technique of inductively coupled plasma mass spectrometry is reported. Real seawater was used as a matrix for the standard adding calibration and other validation parameters. The samples were open digested at 80 °C with 2 mL HNO and 0.25 mL HF under the hood. A two-step digestion procedure was applied, and the volume was completed to 10 mL with deionized water. Chloride removal was accomplished by using this procedure. The concentrations of Ca and Mg ions were lessened by 15% and 20%, respectively. These results were verified with ion chromatography, SEM-EDS, and mass difference analyses. It was observed that there was a 40% loss in the average mass of particulate matter on the filter media after applying the two-step digestion procedure. Recovery and trueness values were in the range of 86 and 109%. The average precision amounts for elements were determined as RSD (%) in the range of 1.0% and 3.4%. The concentrations of elements determined in the 18 samples collected from the Konyaaltı Beach located in Antalya were higher than the maximum allowable concentrations of the Directive 2013/39/EU.