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The Effects of Diluents on Sodium Ion Transport through Bulk Liquid Membrane with Crown Ether Carriers

100%

Altin S. , Peker I. , Demircioglu N.

tom Vol. 83, nr 2

275-283

In this study, the effects of the different mebrane diluents, carriers and variations in the concentrations of the carriers on the sodium ion transport were examined in bulk liquid mebrane systems. The kinetic analysis of the sodium ion transport in the liquid membrane was performed through the implementation of two consecutive kinetic equations of first order irreversible reactions and the relevant kinetic parameters (k1, k2a, k2m, Rmax, tmax) were determined. Toluene, n-hexane, 1-octanol, chloroform and dichloromethane were used as membrane diluents, while 18crown6 (18C6), dicyclohexyl 18crown6 (DC18C6) and dibenzo 18crown6 (DB18C6) were used as carriers. The results reveal that the best sodium ion transport was realized when toluene-dichloromethane (90%-10%) was used as the membrane, and 1×10-3 M DB18C6 was used as the carrier.

Industrial noise and its effects on humans

100%

Atmaca E. , Peker I. , Altin A.

Polish Journal of Environmental Studies

2005

tom 14

nr 6

The problem of noise in the industries around Sivas has been examined in this study; and noise measurement and survey studies have been carried out at concrete traverse, cement, iron and steel and textile factories located in this region. A questionnaire was completed by 256 workers during this study in order to determine the physical, physiological, and psycho-social impacts of the noise on humans and to specify what kind of measurements have been taken both by the employers and workers for protection from the effects of noise. It has been specified, during the surveys, that the noise levels detected in all the industries are much above the 80 dBA that is specified in the regulations: 73.83% of the workers in these industries are disturbed from the noise in their workplaces, 60.96% of them have complaints about their nervous situations, 30.96% of these workers are suffering hearing problems although they had not had any periodical hearing tests and they are not using ear protection equipment.