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Abstract

HEAVY METAL ACCUMULATION IN BARK OF AZADIRACHTA INDICA DUE TO VEHICULAR EMISSION

Dr. Syeda Azeem Unnisa* and Dr. C.Venkateshwar

ABSTRACT

This study is to estimate the level and accumulation of lead in Azadirachta indica (Neem) bark exposed to motor vehicle emissions and noise pollution status within the Campus of Osmania University. Noise pollution studies have been carried out using a digital sound level meter Model SL-4001made in Taiwan. Noise measurements were taken from 7 locations within the campus in three different time intervals of the day i.e, in the morning 9-10 am, midday 12-1 pm and in evening 5-6 pm on working and non-working days. The results indicate that on working days the minimum noise level was recorded as 79.88 dB and maximum of 97.57 dB whereas on non-working days the minimum noise level was recorded as 72.72 dB and maximum of 88.62 dB. The study revealed the fact that noise levels have reached an alarming level due to the vehicular emissions and the main source of heavy metal accumulation in the bark of Azadirachta indica is directly correlated to the vehicular emissions within the campus. It is observed that all the selected locations, the level of noise was found to be above prescribed noise standard level limits of 50 dB for minimum and 40 dB for maximum for silent zone as summarized by the Central Pollution Control Board and Noise Pollution which calls for the urgent need in employing control technologies. Using Atomic Absorption Spectroscopy, concentration of lead was determined in bark samples of Azadirachta indica obtained within the campus. The level of lead in various samples varied between 0.0548 to 0.1082 mg/kg. However, the level of Pb obtained from the samples from various locations from campus was within the permissible limits of WHO/FDA permissible levels of heavy metals in herbal plants.

Keywords: Noise pollution, Vehicular emissions, Heavy metal, Bark, Azadirachta indica, Bio-indicator.


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