Publications by authors named "Paulraj Jawahar"

4 Publications

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Dietary intake of trace elements from commercially important fish and shellfish of Thoothukudi along the southeast coast of India and implications for human health risk assessment.

Mar Pollut Bull 2021 Dec 9;173(Pt A):113020. Epub 2021 Oct 9.

Department of Fish Quality Assurance and Management, Fisheries College and Research Institute, Thoothukudi, India.

The concentrations of eight trace elements (chromium, cobalt, copper, zinc, arsenic, cadmium, mercury and lead) in14 commercially important fish and shellfish collected from Thoothukudi along the southeast coast of India was investigated using inductively coupled plasma mass spectrometry in order to assess the health risks associated with their consumption. The concentration of trace elements ranged from 0.001 to 39.5 μg/g. The estimated weekly intake of cadmium in seven fish and shellfish (0.0081-0.0996 mg/kg body weight) were above the provisional tolerable weekly intake set by the Joint FAO/WHO Expert Committee on Food Additives. The risk assessment analysis indicated that there was non- carcinogenic risk upon lifetime consumption of rock crab, C. natator (TTHQ >1) and carcinogenic risks upon lifetime consumption of S. jello, P. semisulcatus, P. sanguinolentus C. natator, Uroteuthis duvaceli, Sepia pharaonis and Cistopus indicus due to cadmium exposure indicating a potential health risk to the exposed consumers.
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http://dx.doi.org/10.1016/j.marpolbul.2021.113020DOI Listing
December 2021

Effect of triclosan (TCS) on the protein content and associated histological changes on tilapia, Oreochromis mossambicus (Peters, 1852).

Environ Sci Pollut Res Int 2021 Nov 20;28(42):59899-59907. Epub 2021 Jun 20.

Department of Fisheries Biology and Resource Management, Fisheries College and Research Institute, Tamil Nadu Dr. J. Jayalalithaa Fisheries University (TNJFU), Thoothukudi, Tamil Nadu, 628 008, India.

Triclosan is a chlorinated phenolic antimicrobial agent having a wide application in commercial and healthcare products. The toxic effects of the emerging pollutant, triclosan (TCS), on behavior, protein content, and associated histological alterations in the muscle tissue of the freshwater fish Oreochromis mossambicus were studied. Healthy fishes were exposed to five different acute concentrations of TCS, viz., 0.131, 0.262, 0.523, 1.046, and 2.092 ppm for a period of 96 h. The 96-h LC of TCS for O. mossambicus was determined as 0.715 ppm using probit analysis. The fishes were also chronically exposed to the five different concentrations of TCS based on LC to study the toxic effects of long-term exposure. The protein content of the fish muscle gradually decreased with an increase in the concentration of TCS. Further, the histological alterations such as splitting of myotomes, vacuolar degeneration, degenerated myotomes, multifocal degeneration of myocytes, degeneration of myoepithelium, myolysis, melanomacrophage in the dermis, vacuolation in the epidermis, atrophy of myotomes, and necrosis were observed during the acute and chronic exposure of fishes to TCS. The study revealed that TCS can affect the aquatic organisms even at a minimum concentration of 0.715 ppm causing changes in the behavior and biochemical constituents of tilapia.
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http://dx.doi.org/10.1007/s11356-021-14990-4DOI Listing
November 2021

Concentrations of trace elements in the organs of commercially exploited crustaceans and cephalopods caught in the waters of Thoothukudi, South India.

Mar Pollut Bull 2020 May 11;154:111045. Epub 2020 Mar 11.

Department of Fish Quality Assurance and Management, Fisheries College and Research Institute, Thoothukudi, Tamil Nadu, India.

Concentrations of trace elements (arsenic, cadmium, mercury, and lead) in tissues (muscle, gills, and digestive gland) of three commercially exploited crustaceans (Portunus sanguinolentus, Charybdis natator, and Penaeus semisulcatus) and three cephalopods (Doryteuthis sibogae, Sepia pharaonis, and Cistopus indicus) were examined. The animals were captured in the waters of Thoothukudi, and the tissues of six individuals of each species were analyzed using ICP-MS. The highest concentrations of arsenic (16.5 μg/g) and mercury (0.052 μg/g) were recorded in the digestive gland of C. natator, and cadmium (69.9 μg/g) and lead (0.351 μg/g) in the digestive gland of S. pharaonis. The edible portion of the crustaceans and cephalopods contained lower concentrations of trace elements, and these were below allowable limits set by the European Union. The edible parts of the investigated samples are safe for human consumption, but accidental contamination of the edible tissues with material from the digestive glands could lead to concerns relating to metal toxicity.
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http://dx.doi.org/10.1016/j.marpolbul.2020.111045DOI Listing
May 2020

Inferences on the effects of geometries and heat transfer fluids in multi-cavity solar receivers by using CFD.

Environ Sci Pollut Res Int 2020 Sep 10;27(26):32205-32217. Epub 2019 Dec 10.

Department of Mechanical Engineering, Ramco Institute of Technology, Rajapalayam, Tamil Nadu, India.

This paper discusses about the design and analysis of a novel multi-cavity tubular receiver developed for small- and medium-scale concentrated solar power applications from the existing basic baffle-plated volumetric receiver model which is used in large-scale applications. The design and analysis work has been completed to enhance the thermal performance of cavity receivers for the average solar power input of 12 kW with a dish concentrator of 15 m aperture area. This was carried out by replacing the baffle plates from the conventional basic volumetric receiver with multi-cavity tubes, keeping the heat transfer area as constant. The tubular arrangement improves the flow and heat transfer characteristics through minimized pressure drop. The receiver models with aluminum, copper, and silicon carbide materials have been analyzed using commercially available CFD software ANSYS-FLUENT for different flow rates of air and water. The computational analysis reveals that the thermal performance of a modified multi-cavity tubular receiver model made up of SiC material is better than receiver model with aluminum and copper materials. The maximum energy efficiency of 21.11% and 75.81% are achieved by the heat transfer fluids air and water, respectively. The maximum efficiency is achieved at the flow rate of 1.35 l/min and 0.9 l/min for the heat transfer fluids air and water, respectively. The study concludes that the multi-cavity tubular configurations may be well suited for small-scale CSP applications than the volumetric receivers with foams, rods, honeycomb, and baffle-plated structures.
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http://dx.doi.org/10.1007/s11356-019-06829-wDOI Listing
September 2020
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