Showing papers by "Edoardo Mentasti published in 1995"
TL;DR: In this article, different procedures for the determination of ultratrace metal ions in Antarctic sea water have been adopted and critically compared and the investigated metal ions were Cd, Cu, Fe, Mn, Ni and Zn.
38 citations
TL;DR: In this article, an extraction method is proposed in order to evaluate mercury species in biological samples (e.g. fish, mushrooms). Sulphur-containing ligands have been considered and thiourea was chosen for the optimised extraction procedure according to the best recovery obtained (65.9%, 75.8%, 47.1% and 98.2%) and the chromatographic performance.
Abstract: An extraction method is proposed in order to evaluate mercury species in biological samples (e.g. fish, mushrooms). Sulphur-containing ligands have been considered and thiourea was chosen for the optimised extraction procedure according to the best recovery obtained (65.9%, 75.8%, 47.1% and 98.2% for CH 3 Hg + , C 2 H 5 Hg + , C 6 H 5 Hg + and Hg 2+ respectively) and the chromatographic performance. Thiourea solutions added to biological samples enabled extraction of organomercury species ; the influence of reaction time and recovery yields were evaluated. The proposed procedure, coupled with an on-line preconcentration step, allows to reduce contamination problems and to obtain detection limits at ng/g levels. The method has been evaluate with reference materials (BCR).
15 citations
TL;DR: In this paper, the ion-exchange behavior of metal-EDTA complexes and the adsorption effects due to neutral species have been applied for an on-line preconcentration procedure.
11 citations
TL;DR: In this paper, an ion chromatographic (IC) method has been developed for the separation of alkylsulphonic acid, and two different stationary phases, silica-based and polymer-based ion exchange resins, were studied using pure ion exchange and/or hydrophobic interaction mechanisms.
Abstract: An ion chromatographic (IC) method has been developed for the separation of alkylsulphonic acid. Two different stationary phases, silica-based and polymer-based ion-exchange resins, were studied using pure ion exchange and/or hydrophobic interaction mechanisms. Correlations between analyte hydrophobicity and eluent polarity were made in order to investigate the possibility of changing the dominant separation mechanism by varying the eluent composition. The alkyl chain lengths of the sulphonic acids analysed ranged from C1 to C9. Detection limits in the submicromolar range were obtained by suppressed conductivity detection.
7 citations