Browsing by Author "Jawed A.A."

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The usability of Cupressus arizonica annual rings in monitoring the changes in heavy metal concentration in air
(2021-07-01) Cesur A.; Zeren Cetin I.; Abo Aisha A.E.S.; Alrabiti O.B.M.; Aljama A.M.O.; Jawed A.A.; Cetin M.; Sevik H.; Ozel H.B.
Air pollution, which has been increasing in recent years, has reached significant dimensions and has become one of the most important agenda topics of present day. Among air pollution components, heavy metals are of particular importance, since they are not easily decomposed, they tend to bioaccumulate, and some of them have toxic or carcinogenic effects even at low concentrations. Therefore, it is an extremely important subject to monitor the changes in heavy metal concentrations found in air. The most preferred method in determining the changes in heavy metal concentrations in the atmosphere is the use of biomonitors. From past to present, trees have been good biomonitors in determining the increase in heavy metal concentrations in the atmosphere. Particularly, with the help of the annual growth rings of trees, vital information can be obtained on the changes in heavy metal concentrations in air. In this study, after the annual rings were determined on the log taken from the main body of the cypress (Cupressus arizonica) tree cut from the Kisla park located in Kastamonu province, the concentrations of Bi, Cd, and Ni in the outer bark, inner bark, and wood were compared in the inward-facing and road-facing parts of these sections. Also, the changes in heavy metal concentrations in the annual rings were evaluated on a yearly basis. As a result of the study, it was found that the element concentrations in the outer bark of the road-facing part were generally at a higher level, and that the changes in the elements on a yearly basis generally followed a fluctuating course, but there had been a general increase in the Cd and Ni concentrations in recent years.
Variation of Ba concentrations in some plants grown in Pakistan depending on traffic density
(2022-01-01) Cetin M.; Jawed A.A.
Today, one of the most important problems in the world is environmental and especially air pollution. Among the components of air pollution, especially heavy metals are of particular importance because they do not deteriorate and disappear easily in nature, can be toxic and carcinogenic to humans even at low concentrations, and bioaccumulate in living organisms. Therefore, it is extremely important to determine the heavy metal concentrations in the air. Barium (Ba), which has been largely neglected in studies on heavy metals, plays a key role in the production of many products in the industry. However, Ba is one of the most dangerous heavy metals and all barium compounds are toxic. This study was aimed to determine the accumulation of Ba concentration in some plants used extensively in Pakistan depending on traffic density. For this purpose, the variation of Ba concentrations in leaves and branches of Ficus bengalensis, Ziziphus mauritiana, Conocarpus erectus, and Azadrechta indica species depending on traffic density was determined. As a result of the study, it was determined that the most suitable species to be used for monitoring Ba concentration were Azadrechta indica leaves, and the most suitable organs were Azadrechta indica leaves.