In
the last few decades, pharmaceuticals, credited with saving
millions of lives, have emerged as a new class of environmental contaminant.
These compounds can have both chronic and acute harmful effects on
natural flora and fauna. The presence of pharmaceutical contaminants
in ground waters, surface waters (lakes, rivers, and streams), sea
water, wastewater treatment plants (influents and effluents), soils,
and sludges has been well doccumented. A range of methods including
oxidation, photolysis, UV-degradation, nanofiltration, reverse osmosis,
and adsorption has been used for their remediation from aqueous systems.
Many methods have been commercially limited by toxic sludge generation,
incomplete removal, high capital and operating costs, and the need
for skilled operating and maintenance personnel. Adsorption technologies
are a low-cost alternative, easily used in developing countries where
there is a dearth of advanced technologies, skilled personnel, and
available capital, and adsorption appears to be the most broadly feasible
pharmaceutical removal method. Adsorption remediation methods are
easily integrated with wastewater treatment plants (WWTPs). Herein,
we have reviewed the literature (1990–2018) illustrating the
rising environmental pharmaceutical contamination concerns as well
as remediation efforts emphasizing adsorption.
A comprehensive study was conducted to evaluate the persistence of thiram in water and soil under controlled conditions and on two plants, namely tomato and radish, in field conditions. In order to follow the decay of the pesticide, an HPLC procedure was developed employing an octadecyl endcapped RP-C18 column using a mixture of acetonitrile and water as the mobile phase and an ultraviolet detector. Studies conducted in water at different temperature, pH and organic content revealed that the persistence of the pesticide decreases with the increase in all the three variables. In the three different types of soils studied, the effect of pH was more or less apparent on a similar line. On average a slower decay was observed in the case of plants than in water and soil.
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