5 research outputs found
Arsenic Incorporation into Garden Vegetables Irrigated with Contaminated Water
Daily vegetable requirement are mostly fulfilled in Bangladesh through
homestead garden production which are usually irrigated with
arsenic-rich underground water. Garden vegetables grown in
arsenic-tainted soil may uptake and accumulate significant amount of
arsenic in their tissue. Mean, minimum and maximum arsenic content in
some common garden vegetables, e.g. bean, bitter gourd, bottle gourd,
brinjal, chilli, green papaya, mint, okra, palwal, potato, red
amaranth, string bean and sweet gourd, from an arsenicprone locality of
Bangladesh have been assessed. The contribution of vegetable-arsenic in
the daily diet was estimated. Correlation with the groundwater arsenic
status and statistical significance of variations has been discussed
Laterite-A Potential Alternative for Removal of Groundwater Arsenic
Arsenic removal by heat treated laterite from contaminated water was
investigated through batch adsorption experiments. The removal rate was
dependent on the initial arsenic concentrations and a high initial rate
of removal followed by a slower subsequent removal rate with a gradual
approach to a steady-state condition. Rate kinetics was studied using
both first-order and pseudo-second order models, and intraparticle
diffusion from the solution to the adsorption sites was considered as
major rate controlling step. Adsorption equilibrium data pointed to
favorable adsorption of arsenic onto laterite and fitted with both
Langmuir and Freundlich models. Thermodynamic data suggested chemical
nature of the adsorption. Experimental data were used to estimate the
life-time of laterite as a column packing-adsorber with the simplest
assumptions and for typical initial concentration ( 3c0.30 mg L-1
arsenic) it was 74 days maximum while to achieve WHO safe limit (0.01
mg L-1). Laterite is a natural substance and can be collected very
cheaply, so its utilization for arsenic removal is expected to be
economical and feasible. It might be a promising alternative of other
proposed arsenic removal media for the arsenic-affected region of the
world
Arsenic Incorporation into Garden Vegetables Irrigated with Contaminated Water
Daily vegetable requirement are mostly fulfilled in Bangladesh through
homestead garden production which are usually irrigated with
arsenic-rich underground water. Garden vegetables grown in
arsenic-tainted soil may uptake and accumulate significant amount of
arsenic in their tissue. Mean, minimum and maximum arsenic content in
some common garden vegetables, e.g. bean, bitter gourd, bottle gourd,
brinjal, chilli, green papaya, mint, okra, palwal, potato, red
amaranth, string bean and sweet gourd, from an arsenicprone locality of
Bangladesh have been assessed. The contribution of vegetable-arsenic in
the daily diet was estimated. Correlation with the groundwater arsenic
status and statistical significance of variations has been discussed