Ibrahim Peker’s research while affiliated with Erciyes University and other places

In this study, the effects of the different membrane diluents, carriers and variations in the concentrations of the carriers on the sodium ion transport were examined in bulk liquid membrane 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, k2a, 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.

Özet Bu çalýþmada Sivas þehir merkezinin çevresel gürültü kirliliði araþtýrýlmýþtýr. Bu kapsamda Sivas þehir merkezinin deðiþik yerlerinde 20 adet gürültü ölçüm yeri belirlenmiþ ve bu yerlerde gürültü seviyesini belirlemek için 1 yýl süre ile 5 saatlik aralýklarla sabah 8.00'ten akþam 24.00'e kadar ölçümler yapýlmýþtýr. Elde edilen gürültü deðerleri LAeq (dBA) olarak hesaplanmýþtýr. Ayrýca elde edilen gürültü deðerlerinin mevsimsel deðiþimi de gözlemlenmiþtir. Sonuçlara göre ölçüm noktalarýnda ölçülen gürültü düzeylerinin %100'nün gürültü limit deðeri olan 65 dBA (Çevresel Gürültünün Deðerlendirilmesi ve Yönetimi Yönetmeliði) ve 55 dBA (WHO)'dan yüksek çýktýðý görülmüþtür. Sonuç olarak Sivas ili þehir merkezinde çevresel gürültü kirliliðinin önemli bir seviyede olduðu saptanmýþtýr. Anahtar Kelimeler: Gürültü, çevresel gürültü, gürültü kirliliði, Sivas. Investigation of The Environmental Noise Pollution in Sivas City Centre Abstract This study presents the results of a research conducted on the environmental noise pollution in the Sivas city centre. In this respect, points at 20 different areas were selected for noise measurement at the Sivas city centre and in order to determine the noise levels of these areas, measurements were taken at 5 hour intervals over a period of one year, between 08:00 in the morning and 24:00 at night. The results of the measurements were used to calculate at LAeq (dBA) and furthermore the results of the measurements were shown to change on seasonal. According to the results, noise levels at the measurement points were aboveby 100% and more than the recommended limits of 65 dBA (Regulation on the Assessment and Management of Environmental Noise) and 55 dBA (WHO), respectively. These show that the levels of environmental noise pollution in the Sivas province city centre is extremely significant.

This study presents the results of a research conducted on the environmental noise pollution in the Sivas city centre. In this respect, points at 20 different areas were selected for noise measurement at the Sivas city centre and in order to determine the noise levels of these areas, measurements were taken at 5 hour intervals over a period of one year, between 08:00 in the morning and 24:00 at night. The results of the measurements were used to calculate at LAeq (dBA) and furthermore the results of the measurements were shown to change on seasonal. According to the results, noise levels at the measurement points were aboveby 100% and more than the recommended limits of 65 dBA (Regulation on the Assessment and Management of Environmental Noise) and 55 dBA (WHO), respectively. These show that the levels of environmental noise pollution in the Sivas province city centre is extremely significant.

In this study, the effects of the acceptor phase and the donor phase properties on sodium ion transport were examined in bulk liquid membrane systems. In the experiments, toluene and a mixture of toluene–dichloromethane (90–10%, v/v) containing 1×10−3M DB18C6 (dibenzo18crown6) was used as the membrane. In order to examine the effects of different the acceptor phases, firstly H2SO4, HCl, HNO3, CH3COOH and distilled water were used as the acceptor phases. Furthermore, the experiments were performed by using various acid concentrations such as 2, 0.2 and 0.02M of acids, as the acceptor phase. In the second part of the study, the effect of donor phase on sodium ion transport was examined. For this examination, Na2SO4, NaNO3, NaOH and NaCl were applied. In order to determine the effect of the donor phase concentration, the experimentation was performed using 1.08×10−2, 2.17×10−2, 3.26×10−2 and 4.34×10−2M concentrations of Na+ in form of NaCl. Finally, nonsteady-state kinetics was applied on all data obtained from the experiments and reaction constants (k1, k2, and k3) and the values of the Rmax, tmax, k1/k2 were calculated. Consequently, it was determined that the type and the concentration of the acceptor phase and the donor phase solutions were significant for transport efficiency in liquid membrane systems. The most efficient transport was obtained by applying 2M H2SO4 and 2.17×10−2M Na+ in form of NaCl. Besides, It was observed that there was a significant effect of the anion attached to the cation on transport efficiency.

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.