Browsing by Author "Sujata Kashyap"

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Contamination profile and potential human health risks of radon in groundwater of southwest region of Punjab, India
(Springer, 2025) S. K. Singh; Sandeep K. Malyan; Kaptan Singh; Sujata Kashyap; Rajesh Pal B. Singh; Shive Prakash Rai; Sumant R. Kumar; Pradeep Kumar
Radon (Rn) is a naturally occurring radioactive gas produced by the decay of uranium-bearing minerals in rocks and soils. Long-term exposure to elevated radon levels in drinking water is associated with an increased risk of stomach and lung cancers. This study aims to assess the concentration of radon in groundwater and evaluate its potential health risks in six cancer-affected districts, i.e., Bathinda, Mansa, Ferozepur, Faridkot, Fazilka, and Sri Muktsar Sahib, of southwest Punjab, India. A total of 186 samples were collected from deep and shallow borewells using a 10 × 10 km2 grid-based sampling strategy, and Rn concentrations were measured onsite. Detectable levels of Rn were observed in 100% of the samples, ranging from 0.841 to 11.80 Bq/L, with an average of 3.63 ± 1.50 Bq/L. Most values were below the USEPA limit of 11.1 Bq/L (≈300 pCi/L). The annual effective dose from ingestion and inhalation was within the WHO-recommended safe reference dose level of 100 µSv/year across all age groups. However, the estimated excess lifetime cancer risk ranged from 0.29 × 10–4 to 8.37 × 10–4, with an average value of 2.57 × 10–4, indicating that a majority of samples exceeded the USEPA unacceptable risk level of ≤ 1.00 × 10⁻4. While current Rn levels may not pose immediate health threats, the potential for long-term risks, particularly lung/stomach cancer and leukemia, remains. The study highlights the need for regular groundwater quality monitoring and the implementation of mitigation strategies in vulnerable regions. © The Author(s), under exclusive licence to Springer Nature B.V. 2025.
Mn(II) complexes of N0-(2-methoxybenzoyl)hydrazine carbodithioic acid ethyl ester: Synthesis, spectral and structural characterization
(2012) Mamata Singh; Manoj K. Bharty; Aarti Singh; Sujata Kashyap; Udai P. Singh; Nand K. Singh
Two new Mn(II) complexes [Mn(Hmbhce)2- (o-phen)] (1) and [Mn(Hmbhce) 2(bpy)] (2) based on N0-(2- methoxybenzoyl)hydrazine carbodithioic acid ethyl ester (H2mbhce) have been synthesized by reacting Mn(OAc)2- 4H2O with H2mbhce in the presence of o-phen/bpy. The complexes have been characterized by elemental analyses, magnetic susceptibility measurement, IR, UV-Vis and single crystal X-ray data. Both complexes [Mn(Hmbhce)2- (o-phen)] and [Mn(Hmbhce)2(bpy)] crystallize in monoclinic system with space group P 21/c and P 21/n, respectively. The single crystal X-ray structures of 1 and 2 show that the Mn(II) center is bonded with two (Hmbhce)- through carbonyl oxygen and deprotonated hydrazinic nitrogen, plus two nitrogen atoms from one o-phen/bpy coligand. The crystal structures of complexes 1 and 2 are stabilized by weak intramolecular N-H⋯O hydrogen bonding and C-H⋯p interactions giving supramolecular architectures. © Springer Science+Business Media B.V. 2012.