Naslov
Effects of CaCl2and CaBr2 on the fecundity of Planorbarius corneus L.

Autori
Mažuran, Neda ; Hršak, Vladimir ; Tomić, Mihovil ; Papeš, Dražena

Izvornik
Chemosphere (0045-6535) 38 (1999), 10; 2345-2355

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Planorbarius corneus L.; calcium chloride; calcium bromide; high density brines; fecundity; toxicity.

Sažetak
Saturated water solutions of calcium chloride (48.3 g CaCl2/L) and calcium bromide (1065.9 g CaBr2/L) and mixtures, commercially prepared as high density brines, are regulary used during special operations in exploration and production of natural gas and crude oil. After operations, all workover fluids are left in the enviroment as waste. In the present study, the effects of several sublethal concentrations of these solutions (CaCl2 1202 ppm, 2403 ppm and 4796 ppm CaBr2 1065 ppm, 2663 ppm and 5325 ppm, 1:1 volume mixture 773.9 ppm, 3855 ppm and 5779 ppm) on the fecudity of the freshwater snail Planorbarius corneus L., were laboratory tested. During the six week exposure a cosiderably reduced fecudity was found. The tested CaCl2 solution concentrations reduced fecudity by 53.9-84.4%, CaBr2 by 72.3-90.8% and mixture by 72.5-94.0% compared with the control groups.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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