Abstract
There is a major concern among scientists over the elevated levels of arsenic (As) in drinking water in Bangladesh and some parts of India. Investigating the release of As from water filter sludge in soil and its uptake by plants may provide information about the management of As contaminated filter sludge. In this macrocosm study, iron based sludge con- taining granular ferric hydroxide (GFH) was mixed with air dried silt loam surface soil at rate of 0 (control, no sludge), 1.5 and 2.5 t?ha?1 and red amaranth (Amaranthus tricolor L.) plants were grown for 45 days. Addition of filter sludge did not affect the height, fresh weight and dry matter yield of amaranth. However, the highest concentration of As and Fe were found both in shoots and roots of amaranth grown in the pot of the highest rate of sludge treated soil. The con- centration of As, Fe and S was higher in the roots than that in the shoots of Amaranth. Translocation of As, S and Fe in- creased with the rates of sludge application. Elevated concentration of As in sludge treated plants is a sign of environ- mental hazard and should be taken into consideration.
Highlights
Arsenic (As) contamination through soil-water-plant are of international concern due to widespread distribution in South East Asia, namely, Bangladesh and its potential health risks on human and animals [1]
Arsenic contaminated groundwater when used for irrigation, led to the accumulation of arsenic in soil and the eventual exposure of the food chain through plant uptake and animal consumption [4]
The main source of air and soil contamination with arsenic compounds is the mining of coal and oil as well as mining and metallurgy of non-ferrous metals [5]
Summary
Arsenic (As) contamination through soil-water-plant are of international concern due to widespread distribution in South East Asia, namely, Bangladesh and its potential health risks on human and animals [1]. Arsenic contamination through drinking water and other ways including arsenic contaminated foods poses threat to human health. Arsenic contaminated groundwater when used for irrigation, led to the accumulation of arsenic in soil and the eventual exposure of the food chain through plant uptake and animal consumption [4]. The release of arsenic from arsenic removal water filter sludge could enhance arsenic bioavailability to plants due to mobilization of As into the soil solution. The objective of this study was to investigate the extent of arsenic release from arsenic removal water filter sludge and its uptake by amaranth plant
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