Abstrakti
Two sequential injection systems have been developed for adsorptive stripping voltammetric measurement. One is
for substances adsorbing at mercury, e.g. riboflavin. In this case, a simple arrangement with only sample aspiration
is needed. Reproducibility was 3% and detection limit 0.07 mM. The measuring system was applied to determination
of riboflavin in vitamin pills and to study the photodegradation process of riboflavin in aqueous solutions. In the
second case, metal ions were determined. They have to be complexed before deposition on the mercury surface. Thus,
both the sample and the ligand have to be aspirated in the system. In this case, the reproducibility was :6% and the
detection limit B0.1 ppm for cadmium, lead and copper when complexation with oxine was used. Dimethylglyoxime
was used in determination of nickel and cobalt and nioxime complexes were used in determination of nickel and
copper. With these complexing agents, the reproducibility was the same as with oxine, but the metals could be
determined at concentrations lower than 0.01 ppm. Application of two ligands in a SIA system with AdSV detection
was also studied. Simultaneous determination of copper, lead, cadmium and cobalt was possible by using oxine and
dimethylglyoxime. Copper and nickel were simultaneously determined by using dimethylglyoxime and nioxime.
for substances adsorbing at mercury, e.g. riboflavin. In this case, a simple arrangement with only sample aspiration
is needed. Reproducibility was 3% and detection limit 0.07 mM. The measuring system was applied to determination
of riboflavin in vitamin pills and to study the photodegradation process of riboflavin in aqueous solutions. In the
second case, metal ions were determined. They have to be complexed before deposition on the mercury surface. Thus,
both the sample and the ligand have to be aspirated in the system. In this case, the reproducibility was :6% and the
detection limit B0.1 ppm for cadmium, lead and copper when complexation with oxine was used. Dimethylglyoxime
was used in determination of nickel and cobalt and nioxime complexes were used in determination of nickel and
copper. With these complexing agents, the reproducibility was the same as with oxine, but the metals could be
determined at concentrations lower than 0.01 ppm. Application of two ligands in a SIA system with AdSV detection
was also studied. Simultaneous determination of copper, lead, cadmium and cobalt was possible by using oxine and
dimethylglyoxime. Copper and nickel were simultaneously determined by using dimethylglyoxime and nioxime.
| Alkuperäiskieli | Englanti |
|---|---|
| Sivut | 1211–1219 |
| Julkaisu | Talanta |
| Vuosikerta | 53 |
| Tila | Julkaistu - 2001 |
| OKM-julkaisutyyppi | A1 Julkaistu artikkeli, soviteltu |