Authors:P. Kothai, I. Saradhi, P. Prathibha, G. Pandit, and V. Puranik
Coarse and fine fractions of particulate matter (PM) were collected and analysed for trace elements using Instrumental Neutron
Activation Analysis and Energy Dispersive X-ray Fluorescence techniques. The result showed high concentrations of Fe, S, Zn
and Pb in both the size fractions. The elemental data obtained is used to analyze the temporal and seasonal variations. The
trend showed maximum concentrations of PM and metals during winter and minimum during the monsoon season. Enrichment Factor
(EF) and source analysis was performed for the same data set to identify the strength of contribution of anthropogenic sources
and the possible contributing sources in the study area. EF studies showed high enrichments of Zn, Pb and As in the fine fraction
particles. Crustal, vehicular and industrial emissions are identified as the major contributing sources of PM in the study
Authors:S. Mishra, S. Maity, S. Bhalke, G. Pandit, V. Puranik, and H. Kushwaha
In order to understand the mobility of uranium it is very important to know about its sorption kinetics and the thermodynamics
behind the sorption process on soil. In the present study the sorption kinetics of uranium was studied in soil and the influence
parameters to the sorption process, such as initial uranium concentration, pH, contact time and temperature were investigated.
Distribution coefficient of uranium on soil was measured by laboratory batch method. Experimental isotherms evaluated from
the distribution coefficients were fit to Langmuir, Freundlich and Dubinin–Radushkevich (D–R) models. The sorption energy
for uranium from the D–R adsorption isotherm was calculated to be 7.07 kJ mol−1.The values of ΔH and ΔS were calculated to be 37.33 kJ mol−1 and 162 J K−1 mol−1, respectively. ΔG at 30 °C was estimated to be −11.76 kJ mol−1. From sorption kinetics of uranium the reaction rate was calculated to be 1.6 × 10−3 min−1.
Authors:Sangita Pal, Suchismita Mishra, S. Satpati, G. Pandit, P. Tewari, and V. Puranik
“In-House” resin Polyacrylhydroxamic acid (PHOA) has been synthesized and utilized targeting ground water remediation; recovery
of uranium from low concentration aqueous solution e.g., mining activities related water, flooding of excavated or deplumed
areas, nuclear plant washed effluent and process generated effluents in nuclear plant during front-end as well as back-end
treatment. In the present study, treatment of field effluent containing heavy metals and radio-nuclides from contaminated
mining sites reflected preference for uranium with respect to manganese. The specific complexation between the extractant
and metal ion especially uranium provides high distribution co-efficient (Kd) for uranium (Kd,U = 1,450 mL/g from inlet of Effluent Treatment Plant (ETP) and Kd,U = 74,950 mL/g for synthetic solution) compared to high level impurity (1,000 times higher concentration) of manganese (Kd,Mn = 111 mL/g from inlet of ETP and Kd,Mn = 10,588 mL/g for synthetic solution). The “In-House” resin showed significant extractability (70–95% elution efficiency)
and indicates a possibility of selective removal/recovery of the valuable metal ions even from secondary sources. As a specialty,
resin can be regenerated and reused.
Authors:Sukanta Maity, S. Mishra, S. Bhalke, G. Pandit, V. Puranik, and H. Kushwaha
In case of ground (groundwater) contamination or contaminants release from the disposal modules (facilities) to the geo-environment,
the fate of contaminant transport is mainly governed by the parameter called distribution (partition) coefficient, Kd. It is a measure of sorption of contaminants to soils. For that the sorption of polonium in soil were carried out using laboratory
batch method in different soil samples collected from different places around Turamdih uranium mining site. The kinetics of
polonium sorption were also carried out at different time intervals which clearly indicates that sorption equilibrium for
polonium achieved at around 72 h. The Kd for polonium varies from 1,443 to 7,501.3 L/kg in soil samples. Chemical characterization of soil and ground water samples
were carried out to know the effect of various chemical parameters with distribution coefficient of polonium.