An assessment of mercury-species-dependent binding with natural organic carbon

Loux, Nicholas T.

doi:10.3184/095422998782775754

Cited by 63 publications

(36 citation statements)

References 31 publications

(40 reference statements)

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“…The mean values recorded in this study are slightly higher than expected (1.02 ± 0.3%, range 0.41-1.42%,), but lower than those recorded in the continental margins (>1.5% in Seiter et al, 2004;4-16% in Arthur et al, 1998). The TOC values are similar to those recorded in the northern Gulf of Mexico (0.34-1.59% in Goni et al, 1997;1998;Gordon and Goni, 2004;0.37-1.3% in Morse and Beazley, 2008) and those from other basins at similar latitudes, i.e.,: The Argentina Basin (0.26-1.72% in Stevenson and Cheng, 1972) and the Arabian Sea (0.04-1.5% in Grandel et al, 2000). The highest value of this study is in agreement with the values described by Seiter et al (2004) for tropical regions, including the continental margin of western Africa.…”

Section: Total Mercurysupporting

confidence: 69%

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The Correlations Between Mercury Speciation and Dissolved Organic Matter in the Sediment of the Red Sea

Wedyan

Ababneh

Al-Rousan

2012

American Journal of Environmental Sciences

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This study addresses the correlations between Hg and organic matter in recent sediment; samples were collected from the Gulf of Aqaba, Red Sea coasts (oligotrophic regions) during 2010. In the present study TOC analyzer was used to determine Total Organic Carbon (TOC) and Total Nitrogen (TN) concentrations and the total amount of mercury (Hg T ) in sediment samples were analyzed by Hydra-C mercury analyzer. The obtained results indicated that, mercury, TOC and TN average concentrations in the Red Sea were 85.42 ng g −1 , 5.10 and 4.45 mg L −1 , respectively. The results show that the Total Organic Carbon (TOC) in sediment represents the sum of various organic compounds, which may play a completely different role in the distribution and accumulation of Hg. slightly correlations between the TOC and the concentration of Hg in the studied sediment arise mainly from the labile portion of organic matter released. These compounds primarily consist of easily degradable algal-derived lipids and various pigments, which are petrographically described as a soluble Organic Matter (OM). The preserved OM in sediment is commonly entrapped within the cell walls of phytoplankton and also appears as a surface coating on sediment particles. The strong affinity between Hg and OM is due not only to its chemical reactivity, but also to the physical characteristic of these labile compounds, which plays the most important role in the distribution of Hg in sediment.

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Section: Total Mercurysupporting

confidence: 69%

“…There is increasing evidence that DOM interacts with mercury as well which is altering its speciation and bioavailability in aquatic environments (Loux, 1998). In coastal waters, more than 60% of the dissolved mercury is associated with organic matters or suspended particles (Fitzgerald and Lyons, 1973).…”

Section: Introductionmentioning

confidence: 99%

The Correlations Between Mercury Speciation and Dissolved Organic Matter in the Sediment of the Red Sea

Wedyan

Ababneh

Al-Rousan

2012

American Journal of Environmental Sciences

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“…Arguably, these watershed changes can influence mercury release from watersheds, and that increased DOC output could lead to a greater efficiency in the transport of mercury and methyl mercury (Mierle and Ingram, 1991;Driscoll et al, 1994;Rencz et al, 2003). The model results presented by Loux (1998) suggests that organo-sulfur, as sulfhydryl groups, account for much of the mercury binding, indicating that DOC alone cannot explain ionic mercury binding and the partitioning of mercury released from watersheds. The model results presented by Gbondo-Tugbawa and Driscoll (2002) further strengthen the importance of long-term chemical changes due to watershed acidification, organic S pools in soils, and longterm release of organic S-mercury complexes.…”

Section: Sitesmentioning

confidence: 99%

Patterns of Mercury Deposition and Concentration in Northeastern North America (1996?2002)

et al. 2005

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Abstract. Data from 13 National Atmospheric Deposition Program Mercury Monitor Network (NADP/ MDN) monitoring stations (1996)(1997)(1998)(1999)(2000)(2001)(2002) and the Underhill (VT) event-based monitoring site (1993)(1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002) were evaluated for spatial and temporal trends. More precipitation and mercury deposition occurred in the southern and coastal MDN sites, except for the Underhill site, which received more mercury deposition than surrounding sites. Precipitation patterns varied. Regionally, higher concentrations of mercury were recorded during the late spring and summer months. Several sub-regional clusters of MDN sites were evident, based on mercury deposition patterns. In general, more mercury was deposited during the summer months. ''Enhanced'' weekly deposition (>250 ng/m 2 ) and distinct seasonal deposition patterns were evident at all MDN sites. Regionally, high depositional periods contributed significantly to annual loads (<20%-$60%). Southern and coastal sites measured more frequent periods of high deposition than inland sites. Spring and summer ''enhanced'' deposition may be important contributing factors to mercury bioaccumulation during the growing season. Recent regional reductions of mercury emissions were not reflected in the regional mercury concentration or deposition data. Few sites showed linear relations between the concentration of mercury in precipitation and acid rain co-contaminants (sulfates and nitrates).

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“…)()CH 3 Erni,1996) Erni, 1996) tions among constants reported in previous tables. The range of values reported by Qian et al (2002) and Karlsson and Skyllberg (2003) of 16.1 to 16.7 for reactions between CH 3 Hg þ and thiol groups may be indicative of a spectrum of thiol site energies resulting from variations in adjacent functional groups (Loux, 1998). Some of this variation also may result from differences in estimated acidity constants.…”

Section: Estimation Of Activity Coefficientsmentioning

confidence: 96%

An assessment of thermodynamic reaction constants for simulating aqueous environmental monomethylmercury speciation

Loux¹

2007

Chemical Speciation & Bioavailability

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An assessment of mercury-species-dependent binding with natural organic carbon

Cited by 63 publications

References 31 publications

The Correlations Between Mercury Speciation and Dissolved Organic Matter in the Sediment of the Red Sea

The Correlations Between Mercury Speciation and Dissolved Organic Matter in the Sediment of the Red Sea

Patterns of Mercury Deposition and Concentration in Northeastern North America (1996?2002)

An assessment of thermodynamic reaction constants for simulating aqueous environmental monomethylmercury speciation

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