Portal de Periódicos da CAPES

Solubility measurements and determination of Setschenow constants for the pesticide carbaryl in seawater and other electrolyte solutions

1992; NRC Research Press; Volume: 70; Issue: 12 Linguagem: Inglês

10.1139/v92-365

1480-3291

Miguel Ángel Huerta-Díaz, Silvio Rodriguez,

Chemical and Physical Properties in Aqueous Solutions

Accurate solubility measurements covering the range 278–318 K were obtained for the carbamate pesticide carbaryl (1-naphthyl-N-methylcarbamate) in water, natural and artificial seawater, and NaCl, Na 2 SO 4 , CaCl 2 , and (CH 3 ) 4 NBr electrolyte solutions. Carbaryl solubilities were determined using a combination of a generator column method and spectrophotometric techniques. In all cases the solubility of carbaryl in water and in the electrolyte solutions increased with an increase in temperature. The salt effect on the pesticide solubility as a function of temperature was obtained by calculating the Setschenow constants for each one of the electrolyte solutions. Salting-out was observed in solutions prepared with NaCl, Na 2 SO 4 , and CaCl 2 as well as in natural and artificial seawater, whereas salting-in was observed with (CH 3 ) 4 NBr solutions.