Biography:

In the past Lokesh P. Padhye has collaborated on articles with Sanjeeb Mohapatra. One of their most recent publications is Oxidation of dithiocarbamates to yield N-nitrosamines by water disinfection oxidants. Which was published in journal Water Research.

More information about Lokesh P. Padhye research including statistics on their citations can be found on their Copernicus Academic profile page.

Lokesh P. Padhye's Articles: (3)

Oxidation of dithiocarbamates to yield N-nitrosamines by water disinfection oxidants

AbstractTwo most commonly used dithiocarbamate (DTC) pesticides, dimethyldithiocarbamate (DMDTC) and diethyldithiocarbamate (DEDTC), were examined in this study to evaluate their potential to form nitrosamines when in contact with various water disinfection oxidants. Results show that DTCs can serve as nitrosamine precursors, by release of secondary amines through hydrolysis or through reactions with oxidants. The reactions of DTCs with monochloramine and ozone were found to be particularly problematic in the risk of generating nitrosamines, though all four tested oxidants, including free chlorine and chlorine dioxide, formed nitrosamines. NDEA yield from DEDTC was lower, by different degrees, than NDMA yield from DMDTC for all four oxidants, which was attributed to the steric hindrance associated with bulkier reaction intermediate that are more difficult to be further oxidized to form nitrosamine. The yield of nitrosamines increased with the oxidant dosage for both monochloramination and ozonation of DTCs. Results for nitrosamine formation from DTCs at varying pH were found to be consistent with the pH trend of nitrosamine formation from ozonation and monochloramination of secondary amines. Kinetic study results and identification and quantification of reaction products suggest that the DTCs were not significant direct precursors of nitrosamines during monochloramination or ozonation, but rather nitrosamines formed were primarily from reaction of oxidants with the amine which may be generated either through hydrolysis or through oxidation of DTCs.

Occurrence and fate of pharmaceuticals in WWTPs in India and comparison with a similar study in the United States

Highlights•Seasonal occurrence and fate of 12 pharmaceuticals at two Indian WWTPs.•Average influent PPCPs detected at 537 μg/L and 353 μg/L at Indian WWTPs.•85% PPCPs removal in WWTP-2 versus 59% in WWTP-1.•PPCPs concentrations in U.S. WWTPs were more than 50% lower.•U.S. WWTPs exhibited 10–30% higher PPCPs removal efficiencies.

ReviewInfluence of surface chemistry of carbon materials on their interactions with inorganic nitrogen contaminants in soil and water

Highlights•Review of chemisorption of inorganic nitrogen contaminants (INC) on carbon surface.•Carbon's surface chemistry plays a critical role in adsorption of INC.•Oxygen containing surface functional groups have been found to be more influential.•Basic sites on carbon surface influence chemisorption of anionic INC.•pH and pHzpc and elemental and mineral composition of carbon are also important.

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