Natural organobromine in marine sediments

New evidence of biogeochemical Br cycling

Alessandra C. Leri, J. Alexandra Hakala, Matthew A. Marcus, Antonio Lanzirotti, Christopher M. Reddy, Satish Chandra Babu Myneni

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Organobromine (Brorg) compounds, commonly recognized as persistent, toxic anthropogenic pollutants, are also produced naturally in terrestrial and marine systems. Several enzymatic and abiotic bromination mechanisms have been identified, as well as an array of natural Brorg molecules associated with various marine organisms. The fate of the carbon-bromine functionality in the marine environment, however, remains largely unexplored. Oceanographic studies have noted an association between bromine (Br) and organic carbon (Corg) in marine sediments. Even so, there has been no direct chemical evidence that Br in the sediments exists in a stable form apart from inorganic bromide (Brinorg), which is widely presumed conservative in marine systems. To investigate the scope of natural Brorg production and its fate in the environment, we probed Br distribution and speciation in estuarine and marine sediments using in situ X-ray spectroscopy and spectromicroscopy. We show that Brorg is ubiquitous throughout diverse sedimentary environments, occurring in correlation with Corg and metals such as Fe, Ca, and Zn. Analysis of sinking particulate carbon from the seawater column links the Brorg observed in sediments to biologically produced Brorg compounds that persist through humification of natural organic matter (NOM). Br speciation varies with sediment depth, revealing biogeochemical cycling of Br between organic and inorganic forms as part of the burial and degradation of NOM. These findings illuminate the chemistry behind the association of Br with Corg in marine sediments and cast doubt on the paradigmatic classification of Br as a conservative element in seawater systems.

Original languageEnglish (US)
Article numberGB4017
JournalGlobal Biogeochemical Cycles
Volume24
Issue number4
DOIs
StatePublished - Dec 7 2010

Fingerprint

Bromine
bromine
marine sediment
Sediments
Seawater
Biological materials
Carbon
Association reactions
sediment
seawater
organic matter
humification
estuarine sediment
Poisons
carbon
Organic carbon
X ray spectroscopy
Bromides
bromide
X-ray spectroscopy

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Global and Planetary Change
  • Environmental Chemistry
  • Atmospheric Science

Cite this

Leri, Alessandra C. ; Hakala, J. Alexandra ; Marcus, Matthew A. ; Lanzirotti, Antonio ; Reddy, Christopher M. ; Myneni, Satish Chandra Babu. / Natural organobromine in marine sediments : New evidence of biogeochemical Br cycling. In: Global Biogeochemical Cycles. 2010 ; Vol. 24, No. 4.
@article{018617d10b924dc1bf6d9b05de584951,
title = "Natural organobromine in marine sediments: New evidence of biogeochemical Br cycling",
abstract = "Organobromine (Brorg) compounds, commonly recognized as persistent, toxic anthropogenic pollutants, are also produced naturally in terrestrial and marine systems. Several enzymatic and abiotic bromination mechanisms have been identified, as well as an array of natural Brorg molecules associated with various marine organisms. The fate of the carbon-bromine functionality in the marine environment, however, remains largely unexplored. Oceanographic studies have noted an association between bromine (Br) and organic carbon (Corg) in marine sediments. Even so, there has been no direct chemical evidence that Br in the sediments exists in a stable form apart from inorganic bromide (Brinorg), which is widely presumed conservative in marine systems. To investigate the scope of natural Brorg production and its fate in the environment, we probed Br distribution and speciation in estuarine and marine sediments using in situ X-ray spectroscopy and spectromicroscopy. We show that Brorg is ubiquitous throughout diverse sedimentary environments, occurring in correlation with Corg and metals such as Fe, Ca, and Zn. Analysis of sinking particulate carbon from the seawater column links the Brorg observed in sediments to biologically produced Brorg compounds that persist through humification of natural organic matter (NOM). Br speciation varies with sediment depth, revealing biogeochemical cycling of Br between organic and inorganic forms as part of the burial and degradation of NOM. These findings illuminate the chemistry behind the association of Br with Corg in marine sediments and cast doubt on the paradigmatic classification of Br as a conservative element in seawater systems.",
author = "Leri, {Alessandra C.} and Hakala, {J. Alexandra} and Marcus, {Matthew A.} and Antonio Lanzirotti and Reddy, {Christopher M.} and Myneni, {Satish Chandra Babu}",
year = "2010",
month = "12",
day = "7",
doi = "https://doi.org/10.1029/2010GB003794",
language = "English (US)",
volume = "24",
journal = "Global Biogeochemical Cycles",
issn = "0886-6236",
publisher = "Wiley-Blackwell",
number = "4",

}

Natural organobromine in marine sediments : New evidence of biogeochemical Br cycling. / Leri, Alessandra C.; Hakala, J. Alexandra; Marcus, Matthew A.; Lanzirotti, Antonio; Reddy, Christopher M.; Myneni, Satish Chandra Babu.

In: Global Biogeochemical Cycles, Vol. 24, No. 4, GB4017, 07.12.2010.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Natural organobromine in marine sediments

T2 - New evidence of biogeochemical Br cycling

AU - Leri, Alessandra C.

AU - Hakala, J. Alexandra

AU - Marcus, Matthew A.

AU - Lanzirotti, Antonio

AU - Reddy, Christopher M.

AU - Myneni, Satish Chandra Babu

PY - 2010/12/7

Y1 - 2010/12/7

N2 - Organobromine (Brorg) compounds, commonly recognized as persistent, toxic anthropogenic pollutants, are also produced naturally in terrestrial and marine systems. Several enzymatic and abiotic bromination mechanisms have been identified, as well as an array of natural Brorg molecules associated with various marine organisms. The fate of the carbon-bromine functionality in the marine environment, however, remains largely unexplored. Oceanographic studies have noted an association between bromine (Br) and organic carbon (Corg) in marine sediments. Even so, there has been no direct chemical evidence that Br in the sediments exists in a stable form apart from inorganic bromide (Brinorg), which is widely presumed conservative in marine systems. To investigate the scope of natural Brorg production and its fate in the environment, we probed Br distribution and speciation in estuarine and marine sediments using in situ X-ray spectroscopy and spectromicroscopy. We show that Brorg is ubiquitous throughout diverse sedimentary environments, occurring in correlation with Corg and metals such as Fe, Ca, and Zn. Analysis of sinking particulate carbon from the seawater column links the Brorg observed in sediments to biologically produced Brorg compounds that persist through humification of natural organic matter (NOM). Br speciation varies with sediment depth, revealing biogeochemical cycling of Br between organic and inorganic forms as part of the burial and degradation of NOM. These findings illuminate the chemistry behind the association of Br with Corg in marine sediments and cast doubt on the paradigmatic classification of Br as a conservative element in seawater systems.

AB - Organobromine (Brorg) compounds, commonly recognized as persistent, toxic anthropogenic pollutants, are also produced naturally in terrestrial and marine systems. Several enzymatic and abiotic bromination mechanisms have been identified, as well as an array of natural Brorg molecules associated with various marine organisms. The fate of the carbon-bromine functionality in the marine environment, however, remains largely unexplored. Oceanographic studies have noted an association between bromine (Br) and organic carbon (Corg) in marine sediments. Even so, there has been no direct chemical evidence that Br in the sediments exists in a stable form apart from inorganic bromide (Brinorg), which is widely presumed conservative in marine systems. To investigate the scope of natural Brorg production and its fate in the environment, we probed Br distribution and speciation in estuarine and marine sediments using in situ X-ray spectroscopy and spectromicroscopy. We show that Brorg is ubiquitous throughout diverse sedimentary environments, occurring in correlation with Corg and metals such as Fe, Ca, and Zn. Analysis of sinking particulate carbon from the seawater column links the Brorg observed in sediments to biologically produced Brorg compounds that persist through humification of natural organic matter (NOM). Br speciation varies with sediment depth, revealing biogeochemical cycling of Br between organic and inorganic forms as part of the burial and degradation of NOM. These findings illuminate the chemistry behind the association of Br with Corg in marine sediments and cast doubt on the paradigmatic classification of Br as a conservative element in seawater systems.

UR - http://www.scopus.com/inward/record.url?scp=78649653852&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=78649653852&partnerID=8YFLogxK

U2 - https://doi.org/10.1029/2010GB003794

DO - https://doi.org/10.1029/2010GB003794

M3 - Article

VL - 24

JO - Global Biogeochemical Cycles

JF - Global Biogeochemical Cycles

SN - 0886-6236

IS - 4

M1 - GB4017

ER -