M.Sc. Tezi Görüntüleme

Student: Gülten YAYLI ABANUZ
Supervisor: Prof. Dr. Necati TÜYSÜZ
Department: Geological Engineering
Institution: Graduate School of Natural and Applied Sciences
University: Karadeniz Technical University, Turkey
Title of the Thesis: Heavy Metal Concentration in Soils and Tea Plants in Black Sea Region
Level: M.Sc.
Acceptance Date: 27/4/2007
Number of Pages: 367
Registration Number: Di588

      The study area covers two geologically different regions which have intensively been carpeted by tea plants in the Eastern Black Sea. The rocks exposed in the region contain considerable amount of trace matals due to Upper Cretaceous massive sulfide formations and Tertiary epithermal mineralizations. Tea plants grow over the soils derived from such mineralized rocks indicate different concentration in Cu, Pb, Zn, Fe, Cd, P, Al, Na, K, S. Most of the analyzed elements except Al shows higher content ratios in basaltic and sedimentary rocks.

The highest average Cu values occur in tea plants in Surmene and Çayeli areas. Pb reaches the highest value in Çayeli and Peronit tea plants. The highest Cu, Pb, Zn concentrations were recorded in soils at Sürmene area wheras the highest Al (7.56 %) concentration was observed in Çayeli. The most enriched soils with recpect to Mn are found in Peronit area. The soils in Sürmene area sampled during first sprout period of tea plants contain relatively high amount of Cu. During third period of sprout, Cd appear to accompany to Cu, Mn enrichments occur in soils of Hopa area sampled during first tea sprout compaign.

      In order to better understand the element distribution processes in tea plants, some experimental studies were undertaken. Young tea plants were planted in small boxes and were applied with Cu, Zn, Cd and Mn element complexes and fertilizes. The effect of fertilizers in element mobility was found to be significant. Especially Amonium sulfate fertilizer increased element uptake of tea plants by lovering pH. Bioavailability coefficents of the applied elements are as follows, Cu: 0.14, Zn: 0.18, Cd: 2.45 and Mn: 0.15. The differences in the amounth of irrigation played an important role in bioavailability and uptake of elements both in soil and tea plants. Cu, Zn, and Mn are relatively easily uptaken by the tea plants from the soils often watered. The amount of water has no effect on Cd uptake.

The Pb concentration sharply decrease from road side to 100 m in land. The Black Sea teas show different trace elements concentrations with respect to World teas.


Key Words: Black Sea, tea, geochemistry, trace element, bioavailability