Details
| Original language | English |
|---|---|
| Pages (from-to) | 9205-9210 |
| Number of pages | 6 |
| Journal | Environmental Science and Technology |
| Volume | 48 |
| Issue number | 16 |
| Early online date | 31 Jul 2014 |
| Publication status | Published - 19 Aug 2014 |
Abstract
Phosphorus (P) mobility from the sediments to the water column is a complex phenomenon that is generally assumed to be mainly redox sensitive and promoted by anoxic conditions. Thus, artificial aeration of the hypolimnium has been used as a remediation technique in eutrophic water bodies but several times with unexpected disappointing results. To optimize lake restoration strategies, the aim of the present study is to assess the P flux from the sediments under transient anoxic-conditions and to identify the relevant drivers. P sequential extraction, microprofiling (of pH, O2 and H2S), and bacterial community identification were performed on a sediment microcosm approach. The results demonstrated that the overall P release from sediments to the water column during transient phase was higher during the oxic phase, mainly from pH sensitive matrixes. The microprofiles signature suggests that the observed pH gradient during the oxic phase can be a result of H2S oxidation in suboxic layers spatially separated and pared to O2 reduction in top layers, through an electroactive bacterial network. These findings point to an additional driver to be considered when assessing P mobility under transient anoxic-oxic conditions, which would derive from pH gradients, built on the microbial electrical activity in sediments from freshwaters volcanic lakes.
ASJC Scopus subject areas
- Chemistry(all)
- Environmental Science(all)
- Environmental Chemistry
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In: Environmental Science and Technology, Vol. 48, No. 16, 19.08.2014, p. 9205-9210.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Mineral Cycling and pH Gradient Related with Biological Activity under Transient Anoxic–Oxic Conditions
T2 - Effect on P Mobility in Volcanic Lake Sediments
AU - Ribeiro, D. C.
AU - Martins, G.
AU - Nogueira, R.
AU - Brito, A. G.
PY - 2014/8/19
Y1 - 2014/8/19
N2 - Phosphorus (P) mobility from the sediments to the water column is a complex phenomenon that is generally assumed to be mainly redox sensitive and promoted by anoxic conditions. Thus, artificial aeration of the hypolimnium has been used as a remediation technique in eutrophic water bodies but several times with unexpected disappointing results. To optimize lake restoration strategies, the aim of the present study is to assess the P flux from the sediments under transient anoxic-conditions and to identify the relevant drivers. P sequential extraction, microprofiling (of pH, O2 and H2S), and bacterial community identification were performed on a sediment microcosm approach. The results demonstrated that the overall P release from sediments to the water column during transient phase was higher during the oxic phase, mainly from pH sensitive matrixes. The microprofiles signature suggests that the observed pH gradient during the oxic phase can be a result of H2S oxidation in suboxic layers spatially separated and pared to O2 reduction in top layers, through an electroactive bacterial network. These findings point to an additional driver to be considered when assessing P mobility under transient anoxic-oxic conditions, which would derive from pH gradients, built on the microbial electrical activity in sediments from freshwaters volcanic lakes.
AB - Phosphorus (P) mobility from the sediments to the water column is a complex phenomenon that is generally assumed to be mainly redox sensitive and promoted by anoxic conditions. Thus, artificial aeration of the hypolimnium has been used as a remediation technique in eutrophic water bodies but several times with unexpected disappointing results. To optimize lake restoration strategies, the aim of the present study is to assess the P flux from the sediments under transient anoxic-conditions and to identify the relevant drivers. P sequential extraction, microprofiling (of pH, O2 and H2S), and bacterial community identification were performed on a sediment microcosm approach. The results demonstrated that the overall P release from sediments to the water column during transient phase was higher during the oxic phase, mainly from pH sensitive matrixes. The microprofiles signature suggests that the observed pH gradient during the oxic phase can be a result of H2S oxidation in suboxic layers spatially separated and pared to O2 reduction in top layers, through an electroactive bacterial network. These findings point to an additional driver to be considered when assessing P mobility under transient anoxic-oxic conditions, which would derive from pH gradients, built on the microbial electrical activity in sediments from freshwaters volcanic lakes.
UR - http://www.scopus.com/inward/record.url?scp=84906257271&partnerID=8YFLogxK
U2 - 10.1021/es501037g
DO - 10.1021/es501037g
M3 - Article
C2 - 25084343
AN - SCOPUS:84906257271
VL - 48
SP - 9205
EP - 9210
JO - Environmental Science and Technology
JF - Environmental Science and Technology
SN - 0013-936X
IS - 16
ER -