Abdullah Özkan

Bio: Abdullah Özkan is an academic researcher. The author has contributed to research in topics: Drilling fluid & Molecularly imprinted polymer. The author has an hindex of 5, co-authored 15 publications receiving 197 citations.

Characterization of Wastewaters Obtained from Hatay Tanneries

Abstract: The leather tanning industry is one of the most significant pollutants in terms of both conventional and toxic parameters. On the other hand, leather industry has an important economic role both in Turkey and in the World. In this study, wastewater samples were taken from 15 different tanneries in the Hatay Region. Wastewaters obtained from liming process and chromium tanning process was analyzed. Sulfide, chromium (III), chromium (VI), oil and grease, total suspended solids (TSS), organic matters, biochemical oxygen demand (BOD), chemical oxygen demand (COD), pH and alkalinity were determined according to Turkish Standard Methods.The determined averages values belong to wastewaters obtained from liming process were as following: pH 11.71; COD 16821 mg L-1; BOD 4357 mg L-1; TSS 39023 mg L-1; oil and grease 364 mg L-1; S-2 concentration 802 mg L-1; alkalinity 2115 mg L-1. The determined averages values belong to wastewaters obtained from chromium tanning process were also as following: pH 4.23; COD 6740 mg L-1; BOD 377 mg L-1; Cr+3 concentrations 372 mg L-1; Cr+6 concentrations 127 mg L-1; TSS 14553 mg L-1; oil and grease 343 mg L-1.The results of all analyzes were higher than wastewater discharge standards. As a result, it’s necessary to use more effective treatments in order to reduce the negative impacts of leather tanning industry that affect environment, natural water resources and at last human health and welfare.

Antakya-Cilvegözü Karayolu Etrafındaki Tarım Arazilerinde ve Bitkilerdeki Ağır Metal Kirliliği

Abstract: Bu calismada, Hatay Iline bagli Antakya-Cilvegozu uluslararasi karayolu cevresindeki tarim arazilerinin ve bu arazilerde yetisen bitkilerin trafik ve tarimsal faaliyet kaynakli agir metal kirliligini belirlemek, toprak ve bitkideki agir metal miktarinin karayoluna olan uzakligi ile olasi degisimini ortaya koymak amaclanmistir. Karayolunun trafik yogunlugu dikkate alinarak 8 farkli ornekleme noktasi belirlenmistir. Karayolunun belirlenen her bir ornekleme noktasinin sag ve sol tarafindan yola 25, 100, 500 m ve 1km uzakliktan, 0-30 cm derinlikten toprak (N=64) ve alinan topraklarda yetistirilen bitki (N=12) ornekleri alinmistir. Alinan topraklardaki agir metaller dietilen triamin pentaasetik asit (DTPA), bitkilerde ise yas yakma yontemiyle ekstrakte edilmistir ve olcumler induktif olarak eslesmis plazma optik emisyon spektrometresi (ICP-OES) cihazi kullanilarak yapilmistir. Calisma sonucunda toprak orneklerinde; Pb 0,130-0,780 mg/kg, Cd 0-0,265 mg/kg, Ni 0,370-3,97 mg/kg, Cr 0-0,120 mg/kg, Co 0-1,83 mg/kg, Al 0-0,700 mg/kg, Fe 1,45-22,8 mg/kg, Cu 0,385-5,43 mg/kg, Mn 1,96-27 mg/kg Zn 0-4,26 mg/kg ve bitki orneklerinde Pb 0-0,155 mg/kg, Cd 0-0,105 mg/kg, Ni 0,100-3,53 mg/kg, Cr 0,0 mg/kg, Co 0,0 mg/kg, Al 0,0 mg/kg, Fe 5,60-25,0 mg/kg, Cu 0,121-4,48 mg/kg, Mn 2,35-15,4 mg/kg, Zn 0,554-6,75 mg/kg araliginda bulunmustur. Yapilan bu calisma sonucunda elde edilen toprak numunelerine ait veriler Turkiye ve Dunyada toprakta musaade edilen agir metal sinir degerleri ile karsilastirildiginda; toprakta agir metal birikiminin kabul edilebilir sinir degeri asmadigi gorulmustur. Bitki orneklerine ait veriler incelendiginde agir metal birikiminin oldugu tespit edilmistir, ancak Dunya Saglik Orgutunun (WHO) ve Birlesmis Milletler Gida ve Tarim Orgutunun (FAO) bitkilerde musaade ettigi agir metal sinir degerleri ile karsilastirildiginda agir metal birikiminin kabul edilebilir sinir degeri asmamis oldugu gorulmustur. Ayrica mesafeye bagli olarak karayolundan uzaklastikca bitki ve topraktaki agir metal seviyelerinin azaldigi tespit edilmistir. Bu durum toprakta ve de bitkide mevcut olan agir metallerin karayolu kaynakli olabilecegini gostermistir

Electrochemical Sensors, a Bright Future in the Fabrication of Portable Kits in Analytical Systems

Abstract: Analysis of food, pharmaceutical, and environmental compounds is an inevitable issue to evaluate quality of the compounds used in human life. Quality of drinking water, food products, and pharmaceutical compounds is directly associated with human health. Presence of forbidden additives in food products, toxic compounds in water samples and drugs with low quality lead to important problems for human health. Therefore, attention to analytical strategy for investigation of quality of food, pharmaceutical, and environmental compounds and monitoring presence of forbidden compounds in materials used by humans has increased in recent years. Analytical methods help to identify and quantify both permissible and unauthorized compounds present in the materials used in human daily life. Among analytical methods, electrochemical methods have been shown to have more advantages compared to other analytical methods due to their portability and low cost. Most of big companies have applied this type of analytical methods because of their fast and selective analysis. Due to simple operation and high diversity of electroanalytical sensors, these types of sensors are expected to be the future generation of analytical systems. Therefore, many scientists and researchers have focused on designing and fabrication of electroanalytical sensors with good selectivity and high sensitivity for different types of compounds such as drugs, food, and environmental pollutants. In this paper, we described the mechanism and different examples of DNA, enzymatic and electro-catalytic methods for electroanalytical determination of drug, food and environmental compounds.