Isolation of mercury resistant bacteria and influence of abiotic factors on bioavailability of mercury -- a case study in Pulicat Lake North of Chennai, South East India

The Science of the Total Environment
Seralathan Kamala Kannan, Ramaswamy Krishnamoorthy

Abstract

Pulicat Lake sediments are often severely polluted with mercury compounds and other toxic heavy metals. Several mercury-resistant bacteria were isolated and identified from the sediments and all the isolates exhibited broad spectrum resistance (both organic and inorganic mercuric compounds). Mercury volatilization showed that four of the isolated Bacillus cereus strains were able to reduce water soluble ionic form of mercury into volatile form via the well known enzymatic reduction. The effect of increasing concentration of mercuric chloride and phenyl mercuric acetate in the growth of this mercury reducing strain was also determined. To study the native physico-chemical parameters, which influence the bioavailability of mercury to bacteria in Pulicat Lake ecosystem, a total of 60 water and 30 sediment samples were collected and analyzed for pH, temperature, dissolved oxygen, salinity, nitrate, nitrite, silicate, phosphate, organic matter and organic carbon. Increased levels of phosphate, nitrite, nitrate, silicate, organic matter and organic carbon during the post monsoon reduce the bioavailability of mercury by forming complexes which may increase the concentration of mercury in the sediments during post monsoon.

Citations

Nov 20, 2015·Archives of Microbiology·Muthusamy GovarthananByung-Taek Oh
Jun 9, 2015·New Biotechnology·Patricia GiovanellaFlávio Anastácio Oliveira Camargo
Apr 24, 2015·Journal of Basic Microbiology·Praburaman LoganathanByung-Taek Oh
Mar 10, 2015·International Journal of Phytoremediation·Jihye BangByung-Taek Oh
Oct 25, 2013·Preparative Biochemistry & Biotechnology·Muthusamy GovarthananByung-Taek Oh
Jun 12, 2014·Food Additives & Contaminants. Part B, Surveillance·Ji Yeon ChoiKyong Su Kim
Dec 10, 2019·Environmental Science and Pollution Research International·Harshavardhan MohanByung-Taek Oh
May 14, 2020·Journal of Environmental Health Science & Engineering·Mohsen MirzaeiHossein Azadi
Jan 25, 2013·Toxicology and Industrial Health·B Prabhu Dass BatvariSeralathan Kamala-Kannan
Apr 20, 2019·Environmental Science and Pollution Research International·Shalini Singh, Vipin Kumar
Oct 18, 2020·Marine Pollution Bulletin·Giuseppe BonannoMartina Orlando-Bonaca

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