Surface and ground waters characterization in Tuscany (Italy) by using algal bioassay and pesticide determinations: comparative evaluation of the results and hazard assessment of the pesticides impact on primary productivity |
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Authors: | Sbrilli Giancarlo Bimbi Benedetta Cioni Fabio Pagliai Lucia Luchi Federico Lanciotti Eudes |
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Institution: | ARPAT-Agenzia Regionale di Protezione Ambientale della Toscana, Servizio Sub-Provinciale di Piombino, via Adige 12, Piombino (Livorno) 57025, Italia. g.sbrilli@arpat.toscana.it |
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Abstract: | Algal bioassays and pesticide analysis were joined in Tuscany regional monitoring of surface and ground waters. Results were compared. Waters affected algal growth in any of the following ways: stimulation, inhibition, stimulation at low concentrations and inhibition at higher concentrations. Most of ground waters inhibited algal growth whereas only a little percentage were contaminated with pesticide. Most of surface waters stimulated algal growth and a higher percentage were contaminated with pesticides. In waters with inhibitory effect toxicological parameters (EC50, EC25, EC10 and NOEC) were measured and compared; EC25 values were very close to NOEC values. Hazard to aquatic primary productivity for each pesticide found during chemical monitoring was evaluated; for this aim the margin of safety (MOS) was calculated by using algal toxicity and the pesticide concentration measured. |
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