Nandita Singh

Banaras Hindu University | BHU · Institute of Environment and Sustainable Development

Particulate-bound metals are reported to be toxic upon exposure through multiple pathways. In this study, both non-carcinogenic and carcinogenic health risks of diverse population age groups from the exposure of particulate-bound metals were systematically investigated considering size-segregated (PM1.1; PM2.1; PM>2.1) metal concentration measured...

Size-segregated airborne fine (PM2.1) and coarse (PM>2.1) particulates were measured in an urban environment over central Indo-Gangetic plain in between 2015 and 2018 to get insights into its nature, chemistry and sources. Mean (±1σ) concentration of PM2.1 was 98(±76)µgm-3 with a seasonal high during winter (DJF, 162±71µgm-3) compared to pre-monsoo...

Sources of airborne particulates (PM10) were investigated in two contrasting sites over central Indo-Gangetic Plain (IGP), one representing a rural background (Mirzapur) and another as an urban pollution hotspot (Varanasi). Very high PM10 concentration was noted both in Varanasi (178 ± 105 μgm⁻³; N:435) and Mirzapur (131 ± 56 μgm⁻³; N:169) with 72%...

Aerosol remote sensing has become a powerful tool to characterize the optical and microphysical properties of aerosols. Several satellite sensors such as MODIS, MISR, OMI, Tropomi and PARASOL utilize the solar electromagnetic radiation for retrieving aerosol properties from space. These instruments have high spatial coverage and can provide aerosol...

Size-resolved water-soluble ionic species (Cl-, NO3-, SO42-, NH4+, Na+, K+, Mg2+ & Ca2+) were measured in size-segregated aerosols (dae <0.43, 0.65, 1.1, 2.1, 3.3, 4.7, 5.8 & >9 µm) collected during October 2018 – May 2019. Sampling was performed for 3 major seasons of India, post monsoon (ON), winter (DJF) and summer (MAM) at an urban aerosol hots...

Organic and secondary inorganic aerosols (SIA) constitute a considerable fraction of atmospheric aerosols and have potential negative effects on human health, visibility reduction and cloud formation. However, aerosol-climate-health nexus predominantly depends on the particle size and chemical composition, which is in most case are function of asso...

The large-scale emissions of airborne particulates from burning of agricultural residues particularly over the upper Indo-Gangetic Plain (IGP) have often been associated with frequent formation of haze, adverse health impacts, and modification in aerosol climatology and thereby aerosol impact on regional climate. In this study, short-term variation...

The Indo-Gangetic Plain (IGP), South Asia experiences frequent haze events during post-monsoon (October-November), especially influenced by the burning of agricultural residues over upper IGP, and additionally instigate by regional boundary conditions. To understand the effects of biomass burning on regional aerosol characteristics, size-segregated...

Airborne particulates were collected over a typical urban environment at middle Indo-Gangetic Plain (IGP) during winter (January-February, 2016), and fractionated into eight stages using an Anderson cascade impactor. The molecular characterization of organic compounds was carried out for coarse mode (PM>2.1), fine mode (PM2.1-1.1) and submicron mod...

Aerosols, a typical multicomponent mixture originating from varying sources, potentially modify the physiochemical properties of atmosphere and thereby induce modifications in insolation, lower tropospheric heating, changes in atmospheric thermal structure, and interruption in circulation systems that both directly and indirectly link it with susta...

Organic aerosol (OA) constitutes a dominant fraction of airborne particulates over Indo-Gangetic Plain (IGP) especially during post-monsoon and winter. Its exposure has been associated with adverse health effects while there are evidences of its interference with Earth's radiation balance and cloud condensation (CC), resulting possible alteration o...

Airborne particulate were collected and fractionated into eight size fractions with eight stage cascade impactor. The organic compounds characterization was carried out for coarse mode (PM>2.1), fine mode (PM2.1-1.1) and submicron mode (PM<1.1). The weekly average mass concentration of total aerosol during wintertime varied from 189-449 µgm-3 (mean...

Airborne particulates comprise of variety of compounds originating either directly from emissions sources and/or evolved through various chemical and micro-physical processes in the atmosphere (Kumar et al., 2016; Murari et al., 2016). Associations of particulates specifically in fine and ultrafine range have often been reported with adverse health...

Airborne particulates were monitored at an urban location of middle Indo-Gangetic Plain (IGP) and subsequently analyzed for particulate diversity and mixing states. Exceptionally high particulate loading were found both in case of coarser (PM10: 157.5±102.9 μgm-3, n=46) and finer particulates (PM2.5: 92.5±49.8 μgm-3). Based on particulate morpholog...

Dissipation and leaching studies of cyazofamid in two texturally different soils of Tarai region of India at two fortification levels (100 and 200 g a.i. ha−1) were carried out for monitoring residual toxicity and groundwater contamination. Soil was extracted with acetone : methanol (5:1 v/v) followed by cleanup with florisil SPE. Separation was ac...

A reliable and sensitive method has been developed and validated for the determination of cyazofamid in water using reverse phase HPLC (RP-HPLC). The analytical procedure involves fortification of water at two doses, liquid–liquid partition with chloroform, separation on Discovery C-18 column using mobile phase acetonitrile: water (60:40 v/v) and d...

Increased hepatic glucose output is one of the major causes of fasting hyperglycemia in diabetic patients. In this study, we investigated the mechanism of action of coagulanolide on hepatic glucose, regulating enzymes in type 2 diabetic C57BL/KsJ-db/db (db/db) mice. Coagulanolide is an active component of Withania coagulans fruit. Oral administrati...

A rapid, sensitive, and accurate method for analysis of cyazofamid has been developed using SPE in texturally different soils and water. The method involved using different solvents or their combinations for the extraction of fungicide from soil and water. The cleanup was done with C-18/florisil/alumina SPE cartridges and finally analyzed by high p...