Determination of trace Se(IV) by anodic stripping voltammetry following double deposition and stripping steps.
A procedure of Se(IV) determination by anodic stripping voltammetry using two deposition and stripping steps at gold electrodes was proposed. A well-defined stripping peak of selenium was obtained at potential 0.9 V. The optimization of parameters influencing the selenium peak current including both deposition and stripping steps was performed. A linear relationship was observed between the Se(IV) peak current and its concentration in the range from 5×10-9to 1×10-7mol L-1. The limit of detection was found to be 8.5×10-10mol L-1. Repeatability of the method determined as RSD % for Se(IV) concentration of 5×10-8mol L-1was 4.3% (n=7). The proposed procedure was used for Se(IV) determination in certified reference material and natural water samples and acceptable results and recoveries were obtained.
Faculty of Chemistry, Maria Curie Sklodowska University, 20-031 Lublin, Poland.
Mateusz
M
Ochab
Faculty of Chemistry, Maria Curie Sklodowska University, 20-031 Lublin, Poland. Electronic address: iwona.rutyna@poczta.umcs.lublin.pl.
Iwona
I
Gęca
Faculty of Chemistry, Maria Curie Sklodowska University, 20-031 Lublin, Poland.
Mieczyslaw
M
Korolczuk
Determination; Double deposition; Selenium; Stripping analysis