Spatial distribution and contamination assessment of six heavy metals in soils and their transfer into mature tobacco plants in Kushtia District, Bangladesh.
Although the tobacco production and consumption rate in Bangladesh is very high and a substantial portion of premature deaths is caused by tobacco smoking, the status of heavy metals in tobacco plants has not yet determined. This study, therefore, investigated the concentrations of Cu, Ni, Cd, Pb, Cr, and Zn in tobacco plants and their surrounding agricultural soils in Kushtia District, Bangladesh. The geochemical maps showed a similar spatial distribution pattern of the analyzed metals and identified Shempur, Kharara, Taragunia, and Shantidanga as metal hot spots. Geoanalytical indexes were applied to assess the extent of soil contamination, and the results depicted that the soils of Shempur, Kharara, Taragunia, and Shantidanga were moderately contaminated where Cd contributed the most to contamination degree (C d) in spite of its relative low content. However, other five areas in Kushtia District were suggested as uncontaminated according to both C d and pollution load index (PLI). The hazard quotient (HQ) and hazard index (HI) showed no possible indication of human health risks via ingestion of agricultural soils. This study also determined that human activities such as excess application of commercial fertilizers, animal manures, and metal-based pesticides were the sources of Cu, Ni, Cd, and Cr enrichment in soils and that the metals into tobacco plants were transported from the soils. The present study conclusively suggested that regulation of improper use of agrochemicals and continuous monitoring of heavy metals in tobacco plants are needed to reduce the tobacco-related detrimental health problems in Bangladesh.
Department of Applied Chemistry and Chemical Technology, University of Rajshahi, Rajshahi, 6205, Bangladesh. narottam.saha@yahoo.com.|School of Earth Sciences, The University of Queensland, St Lucia, QLD, 4072, Australia. narottam.saha@yahoo.com.
Narottam
N
Saha
Environmental Analytical Chemistry Laboratory, NRCD, Institute of Nuclear Science and Technology, BAEC, GPO Box 3787, Dhaka, 1000, Bangladesh. Safiur_baec@yahoo.com.|Atmospheric and Environmental Chemistry Laboratory, Atomic Energy Center, BAEC, 4-Kazi Nazrul Islam Avenue, Dhaka, 1000, Bangladesh. Safiur_baec@yahoo.com.
M Safiur
MS
Rahman
Atmospheric and Environmental Chemistry Laboratory, Atomic Energy Center, BAEC, 4-Kazi Nazrul Islam Avenue, Dhaka, 1000, Bangladesh.
Yeasmin Nahar
YN
Jolly
Department of Applied Chemistry and Chemical Technology, Islamic University, Kushtia, 7003, Bangladesh.
Atiqur
A
Rahman
Department of Applied Chemistry and Chemical Technology, Islamic University, Kushtia, 7003, Bangladesh.
M Abdus
MA
Sattar
Department of Applied Chemistry and Chemical Technology, Islamic University, Kushtia, 7003, Bangladesh.
M Abdul
MA
Hai
D000328:Adult; D000383:Agriculture / Q000379:methods; D001459:Bangladesh; D004784:Environmental Monitoring; D005308:Fertilizers; D006801:Humans; D019216:Metals, Heavy / Q000032:analysis* / Q000378:metabolism; D018570:Risk Assessment; D012989:Soil Pollutants / Q000032:analysis* / Q000378:metabolism; D014026:Nicotiana / Q000378:metabolism*
D005308:Fertilizers; D019216:Metals, Heavy; D012989:Soil Pollutants
Contamination; Fertilizers; Geoanalytical indexes; Soil and tobacco plant metals; Transfer factors