A system to filter freshwater samples in situ in the field is described, using polycarbonate membranes. It was developed and tested with respect to the conventional filtration method, both for its efficiency and for the effect on for its efficiency and for the effect on heavy metal concentrations in the filtrates. A marked reduction of filtration time is obtained and the possibility to carry out one stage filtrations that otherwise would need the filter to be changed. PIXE analysis generally shows an increase of heavy metal concentrations in the filtrates; this is accompanied by a smaller data spread in sub-samples obtained by repeated filtrations, indicating a higher capability in maintaining the nominal membrane pore size during operations, which produces a better dimensional selection. The system is suitable to perform immediate filtration of numerous fresh water samples to be treated in heavy metal pollution assessments.
A filtration system for the size separation of fresh water samples / R., Zonta; Cecchi, Rodolfo; F., Costa; F., Simionato; Ghermandi, Grazia. - In: SCIENCE OF THE TOTAL ENVIRONMENT. - ISSN 0048-9697. - STAMPA. - 143:(1994), pp. 163-172.
A filtration system for the size separation of fresh water samples
CECCHI, Rodolfo;GHERMANDI, Grazia
1994
Abstract
A system to filter freshwater samples in situ in the field is described, using polycarbonate membranes. It was developed and tested with respect to the conventional filtration method, both for its efficiency and for the effect on for its efficiency and for the effect on heavy metal concentrations in the filtrates. A marked reduction of filtration time is obtained and the possibility to carry out one stage filtrations that otherwise would need the filter to be changed. PIXE analysis generally shows an increase of heavy metal concentrations in the filtrates; this is accompanied by a smaller data spread in sub-samples obtained by repeated filtrations, indicating a higher capability in maintaining the nominal membrane pore size during operations, which produces a better dimensional selection. The system is suitable to perform immediate filtration of numerous fresh water samples to be treated in heavy metal pollution assessments.
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