PENGARUH JUMLAH KENDARAAN DAN KONDISI METEOROLOGIS TERHADAP KANDUNGAN TIMBAL (Pb) PADA DAUN TANAMAN ANGSANA (Pterocarpus indicus) DI JALAN PROTOKOL KOTA SAMARINDA

Abstract

Pb compounds in vehicular emission can be dispersed in the air and absorbed by leaves of plants which are growing on roadside, a species of these plants is Angsana (Pterocarpus indicus). Dispersion of lead is affected by meteorological conditions, such as air temperature, humidity, and wind speed. This study aims to determine the effect of vehicular traffic and meteorological conditions to lead (Pb) consentration in leaves of Angsana (Pterocarpus indicus) from four protocol streets in Samarinda, those are Sutomo-Pahlawan Street, Ir. H. Juanda Street, P. Antasari Street, and Slamet Riyadi Street. Leaf sampling, also measurement for vehicular traffic and meteorological conditions were did for 5 days in each location. Leaves samples with dark green color from the outer branches were analyzed using atomic absorption spectrophotometry through destruction by HNO3 and HClO4. The results showed increasing number of vehicular traffic followed by increasing Pb concentration in Angsana leaves. Meteorological conditions give impact on fluctuating levels of Pb concentration in Angsana leaves. Increasing of air temperature and wind speed followed by decreasing Pb concentration in Angsana leaves. Increasing of humidity followed by decreasing of Pb concentration in Angsana leaves. Rain that last for higher duration can decreased Pb concentration in leaves of Angsana.