1. Department of Analytical Chemistry and Environmental Engineering, Faculty of Applied Chemistry and Material Science, “Politehnica” University of Bucharest, 1 Polizu St., 011061 Bucharest, Romania
2. Department of Analytical Chemistry and Environmental Engineering, Faculty of Applied Chemistry and Material Science, “Politehnica” University of Bucharest, 1 Polizu St., 011061 Bucharest, Romania; Department of Analysis, Tests, and Testings, National Research & Development Institute for Chemistry and Petrochemistry ICECHIM, 202 Splaiul Independentei St., 060021 Bucharest, Romania