Influence of temperature on mass transfer in an incomplete trapping single hollow fibre supported liquid membrane extraction of triazole fungicides.
The influence of temperature in a single hollow fibre supported liquid membrane extraction of triazole fungicides with a stagnant acceptor phase was investigated. The mass transfer parameters such as diffusion coefficient, flux and apparent viscosity were determined at temperature ranging from 278 K to 313 K. Increase in temperature led to an increase in diffusion coefficient and flux. The apparent viscosity also decreased with an increase in temperature. The degree of trapping in the acceptor phase influenced the mass transfer at higher temperature. At lower temperature, the transport of analytes from the donor solution through the donor-membrane interface and through the membrane mainly affected the transport of triazole fungicides. The effect of temperature in a single hollow fibre SLM extraction technique is therefore more pronounced where transport is donor controlled and/or membrane controlled. The partition coefficient of analytes from the acceptor solution to the membrane, K(A) was found to be much higher than that of from the donor solution to the membrane K(D), thus least trapped triazole fungicides preferred to remain in the membrane even with an increased extraction temperature.
Michel
Monika
M
Pesticide Residue Department, Plant Protection Institute, 20 W. Wegorka Str., 60-318 Poznan, Poland.
Chimuka
Luke
L
Cukrowska
Ewa
E
Wieczorek
Piotr
P
Buszewski
Bogusław
B