Intra-annual variations of arsenic totals and species in tropical estuary surface sediments

Chakraborty, Parthasarathi; Jayachandran, Saranya; Babu, P.V. Raghunadh; Karri, Santha; Tyadi, Priyadarshini; Yao, Koffi Marcellin; Sharma, Brij Mohan

doi:10.1016/j.chemgeo.2012.06.018

Cited by 35 publications

(12 citation statements)

References 27 publications

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“…In estuarine system, complexation of Hg with dissolved organic matter, coupled with colloidal coagulation, has been reported to increase total Hg content in sediment at the middle of the estuary (Chakraborty et al, 2012a;Foxa, 1983). The highest concentration of Hg in the sediments, collected at the middle of the Godavari estuary, was probably also due to coagulation of Hg associated suspended particulate matter (SPM) at the middle of the estuary (saline and fresh water mixing predominates at Yanam).…”

Section: Distribution Of Mercury At Three Locations In the Godavari Ementioning

confidence: 97%

“…Downstream of the dam, the Godavari River is naturally divided into Gautami and Vasishta distributaries that form respective estuarine systems ( Fig. 1) (Chakraborty et al, 2012a). This study was conducted at Gautami Godavari estuary as it carries the major river discharge.…”

Section: Study Areamentioning

confidence: 99%

“…Strong affinity of Hg to natural particles helps this toxic metal to ultimately settles down and accumulate in sediments (Chakraborty et al, 2014a(Chakraborty et al, , 2014b(Chakraborty et al, , 2014c(Chakraborty et al, , 2014d(Chakraborty et al, , 2012a. Thus, sediments act as a major sink for Hg.…”

Section: Introductionmentioning

confidence: 99%

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Environmental controls on the speciation and distribution of mercury in surface sediments of a tropical estuary, India

Chakraborty

Babu

2015

Marine Pollution Bulletin

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Section: Distribution Of Mercury At Three Locations In the Godavari Ementioning

confidence: 97%

Section: Study Areamentioning

confidence: 99%

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Environmental controls on the speciation and distribution of mercury in surface sediments of a tropical estuary, India

Chakraborty

Babu

2015

Marine Pollution Bulletin

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“…These include Kotipalli in the Godavari Estuary (India) on the Bay of Bengal with the highest median concentration of 236 ppm (Chakraborty et al, 2012). The second highest median concentration (28.4 ppm), outside of Godavari Estuary, was recorded for the Pacific Ocean off Lima, Peru, in waters up to 364 m deep; the maximum concentration was 42.3 ppm (Böning et al, 2004).…”

Section: Introductionmentioning

confidence: 98%

Occurrence and possible sources of arsenic in seafloor sediments surrounding sea-disposed munitions and chemical agents near Oʻahu, Hawaiʻi

Tomlinson

Carlo

2016

Deep Sea Research Part II: Topical Studies in Oceanography

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“…For example, metal-HS interaction studies were conducted in Cochin backwater [22][23][24] and the Godavari estuarine [25][26][27][28] sediments. However, there are no studies related to aquatic HS and their structural characterization in the Godavari estuary.…”

mentioning

confidence: 99%

Characterization of Humic Substances and their Distribution of XAD Fractions by Absorption Spectroscopy in the Godavari Estuary, India

Chari

Pandi

2017

Current Science

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Humic substances (HS) are formed in estuarine regions by biogeochemical processes of terrestrial and in situ produced organic matters. Their structure and distribution may vary seasonally and spatially. To examine this, HS were isolated from Godavari estuarine waters using ion-exchange resins XAD-8 followed by XAD-4 during 2014-2015. The structural differences between the two fractions were characterized by E 2 /E 3 ratio (a 250 /a 365 ), spectral slope (S 275-295 ), and spectral slope ratio (S R , S 275-295 /S 350-400 ), which were derived from UV-visible absorbance spectra. Lower values of E 2 /E 3 ratio, S 275-295 and S R for XAD-8 fractions than XAD-4, indicate higher aromaticity and higher molecular weight of dissolved organic compounds retained on the former resin. The E 2 /E 3 ratio for XAD-8 and S R for XAD-4 fractions were found to decrease gradually from post-monsoon to monsoon, indicating that the biological process controls the production of organic matter in upstream waters. Lower molecular weight organic compounds formed by bacterial decay and photodegradation during pre-monsoon and higher molecular weight organic compounds formed during the post-monsoon season was attributed to the freshly exudated organic matter from phytoplanktons dominated at the mouth of the estuary.

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Intra-annual variations of arsenic totals and species in tropical estuary surface sediments

Cited by 35 publications

References 27 publications

Environmental controls on the speciation and distribution of mercury in surface sediments of a tropical estuary, India

Environmental controls on the speciation and distribution of mercury in surface sediments of a tropical estuary, India

Occurrence and possible sources of arsenic in seafloor sediments surrounding sea-disposed munitions and chemical agents near Oʻahu, Hawaiʻi

Characterization of Humic Substances and their Distribution of XAD Fractions by Absorption Spectroscopy in the Godavari Estuary, India

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