Bioaccumulation of Cu, Fe, Mn and Zn in native Brachystegia longifolia naturally growing in a copper mining environment of Mufulira, Zambia.

Autor: Mulenga C; Department of Forest and Wood Science, Stellenbosch University, Bag X1 Matieland, Stellenbosch, 7602, South Africa.; Department of Biomaterials Science and Technology, Copperbelt University, P. O. Box 21692, Kitwe, Zambia., Clarke C; Department of Soil Science, Stellenbosch University, Bag X1 Matieland, Stellenbosch, 7602, South Africa., Meincken M; Department of Forest and Wood Science, Stellenbosch University, Bag X1 Matieland, Stellenbosch, 7602, South Africa. mmein@sun.ac.za.
Jazyk: angličtina
Zdroj: Environmental monitoring and assessment [Environ Monit Assess] 2021 Dec 07; Vol. 194 (1), pp. 8. Date of Electronic Publication: 2021 Dec 07.
DOI: 10.1007/s10661-021-09656-0
Abstrakt: Heavy metal contamination in the soil and the subsequent accumulation in Brachystegia longifolia were investigated as a function of the wind direction and distance from a copper mine in Mufulira, Zambia. Soil and leaves of B. longifolia were collected along transects up to 12 km downwind and 19 km upwind. The total concentration of trace elements in the soil and leaves was determined through p XRF. Plant-available Cu, Fe, Mn, and Zn were extracted in a Mehlich III solution and analyzed using ICP-AES. The degree of soil contamination illustrates that Cu and Fe from the copper mine strongly pollute Mufulira and the surrounding forests. Bioavailable Cu, Fe, Mn, and Zn reduced with increasing distance from the mine. An average of 296 mg/kg Cu, 2337 mg/kg Fe, 1101 mg/kg Mn, and 109 mg/kg Zn were recorded in leaves at the most polluted site. Similarly, 55.21 mg/kg Cu, 516.4 mg/kg Fe, 3196 mg/kg Mn, and 154 mg/kg Zn were recorded at an unpolluted site 19 km upwind. The concentration of Cu and Fe reduced significantly with increasing distance, while Mn and Zn increased significantly. It was further established that B. longifolia leaves accumulated Mn (× 38) and Zn (× 15) more than their respective total concentration in the soil. The concentrations of Cu and Fe found in leaves near the mine, as well as the Mn concentration in leaves across the study sites, could be stressful for B. longifolia tree growth.
(© 2021. The Author(s), under exclusive licence to Springer Nature Switzerland AG.)
Databáze: MEDLINE
Externí odkaz: