Distributions of Ferrous Iron and Sulfide in an Anoxic Hypolimnion

1984 ◽  
Vol 41 (2) ◽  
pp. 286-293 ◽  
Author(s):  
Robert B. Cook
Keyword(s):  
Pore Water ◽  
Solubility Product ◽  
Iron Sulfide ◽  
Water Flux ◽  
Sediment Pore Water ◽  
Experimental Lakes Area ◽  
Northwestern Ontario ◽  
Anoxic Hypolimnion ◽  
Decomposition Of Organic Matter

In the anoxic hypolimnion of Lake 227, Experimental Lakes Area, northwestern Ontario, ΣH2S exhibits a mid-depth maximum, while Fe2+ increases with depth. At the mid-depth ΣH2S maximum and below, saturation with respect to amorphous FeS is reached, and the concentration of ΣH2S is limited by the high Fe2+ concentrations, in accord with the FeS solubility product. Values for pKsp[Formula: see text] for FeS determined from the ΣH2S maximum and below averaged 3.16 in 1979 and agree well with other in situ and laboratory measurements. In the top 10 cm of sediment, pore water ΣH2S and Fe2+ are in equilibrium with amorphous FeS. Analyses of cores confirms the existence of an iron sulfide phase. Fe2+, which is produced in the pore water from the decomposition of organic matter, increases to concentrations at which siderite may form, although the presence of siderite has not been verified. Comparison of calculated pore water fluxes of Fe2+ with the observed increase of Fe2+ in the anoxic hypolimnion reveals that about 90% of the observed flux originates at the sediment–water interface, while the remainder is derived from pore water flux.

In situ measurement of dissolved Fe(ii) in sediment pore water with a novel sensor based on C18-ferrozine concentration and optical imaging detection

2019 ◽  
Vol 11 (2) ◽  
pp. 133-141 ◽  
Author(s):  
Chengrong Guo ◽  
Mingjie Ma ◽  
Dongxing Yuan ◽  
Yongming Huang ◽  
Kunning Lin ◽  
...  
Keyword(s):  
Optical Imaging ◽  
Pore Water ◽  
In Situ Measurement ◽  
Sensor System ◽  
Sediment Pore Water ◽  
Imaging Detection

A novel sensor system, which integrated sampling, enrichment, and in situ measurement of dissolved Fe(ii) in sediment pore water, was developed.

scholarly journals Major element concentrations in Mangrove Pore Water, Sepetiba Bay, Brazil

2012 ◽  
Vol 60 (1) ◽  
pp. 33-39
Author(s):  
Christian J. Sanders ◽  
Renato G. S. Barcellos ◽  
Emmanoel V. Silva-Filho
Keyword(s):  
Pore Water ◽  
Major Element ◽  
Sea Water ◽  
Water Flux ◽  
Mangrove Ecosystem ◽  
Major Elements ◽  
Atlantic Rain Forest ◽  
Molar Ratios ◽  
Element Concentrations

Concentrations of cations and anions of major elements (Na+, Ca2+, Mg2+, K+, Cl-, SO4 2-) were analyzed in the pore water of a mangrove habitat. Site specific major element concentrations were identified along a four piezometric well transect, which were placed in distinct geobotanic facies. Evapotranspiration was evident in the apicum station, given the high salinity and major element concentrations. The station landward of an apicum was where major element/Cl- ratios standard deviations are greatest, suggesting intense in situ diagenesis. Molar ratios in the most continental station (4) are significantly lower than the nearby freshwater source, indicating a strong influence of sea water flux into the outer reaches of the mangrove ecosystem and encroaching on the Atlantic rain forest. Indeed, the SO4 2-/Cl- and Ca2+/Cl- ratios suggest limited SO4 2- reduction and relatively high Ca2+/Cl- ratios indicate a region of recent saltwater contact.

scholarly journals COMPARISON OF TWO SAMPLING METHODS (CORER AND IN SITU SEDIMENT SIPPER METHODS) FOR THE PORE WATER OF SEDIMENT

2018 ◽  
Vol 29 ◽  
pp. 1-11
Author(s):  
Muswerry Muchtar
Keyword(s):  
Pore Water ◽  
Sampling Methods ◽  
Sampling Techniques ◽  
Sediment Depth ◽  
Sediment Pore Water ◽  
Advantages And Disadvantages ◽  
Phosphate Nitrate ◽  
Vertical Variations

Effect of two sampling techniques (i.e. corer and sipper samplers) of sediment pore water on measured concentrations of phosphate, nitrate and ammonia was examined. The concentrations of nitrate and ammonia in relation to sediment depth (vertical variations) collected by corer and sipper sampler do not show significant differences, while for phosphate concentrations significant differences occurred. The advantages   and disadvantages of both techniques are discussed.

scholarly journals An In Situ Analyzer for Two-Dimensional Fe(II) Distribution in Sediment Pore Water Based on Ferrozine Coloration and Computer Imaging Densitometry

ACS Omega ◽  
2020 ◽  
Vol 5 (49) ◽  
pp. 31551-31558
Author(s):  
Mingjie Ma ◽  
Honghui Wang ◽  
Jin Xu ◽  
Yongming Huang ◽  
Dongxing Yuan ◽  
...  
Keyword(s):  
Pore Water ◽  
Two Dimensional ◽  
Sediment Pore Water ◽  
Water Based

scholarly journals Kandungan Nitrat dan Fosfat dalam Air Pori Sedimen dan Kolom Air di Daerah Padang Lamun Perairan Pantai Prawean, Bandengan, Jepara

2020 ◽  
Vol 9 (4) ◽  
pp. 464-473
Author(s):  
Eko Wardana Parsaulian Tampubolon ◽  
Ria Azizah Tri Nuraini ◽  
Endang Supriyantini
Keyword(s):  
Water Column ◽  
Pore Water ◽  
Descriptive Analysis ◽  
Nitrate Content ◽  
Seagrass Beds ◽  
Thalassia Hemprichii ◽  
Sediment Pore Water ◽  
Decomposition Of Organic Matter ◽  
Cymodocea Rotundata ◽  
Seagrass Density

ABSTRAK : Secara alamiah konsentrasi zat hara dalam perairan bervariasi untuk masing-masing bentuk senyawanya, termasuk nitrat dan fosfat. Lamun berperan penting terhadap sumbangan nutrien di perairan dengan hasil dekomposisi serasah lamun oleh mikroorganisme pengurai. Fungsi sistem lamun terletak pada pemahaman faktor-faktor yang mengatur produksi dan dekomposisi bahan organik serta efisiensi daur nutrisi dalam sistemnya. Penelitian ini bertujuan untuk mengetahui kandungan nitrat dan fosfat air pori sedimen dan kolom air serta mengetahui jenis dan jumlah kerapatan lamun yang terdapat di perairan Pantai Prawean Bandengan Jepara. Metode penelitian ini menggunakan analisis deskriptif. Analisa kandungan nitrat menggunakan metode analisis SNI 06-6989.31-2005 dan fosfat menggunakan metode analisis BP2-MU-A-08. Pengamatan lamun menggunakan transek kuadrat 50x50cm menurut panduan LIPI. Kandungan nitrat air pori sedimen berkisar 1,85 – 2,82 mg/l, tergolong sedang. Sedangkan kandungan nitrat kolom air berkisar 0,63 – 1,09 mg/l, tergolong rendah. Kandungan fosfat pada air pori berkisar 0,09 – 0,15 mg/l, tergolong sangat subur. Sedangkan kandungan fosfat kolom air berkisar 0,02 – 0,04 mg/l, tergolong cukup subur. Jenis lamun yang ditemukan pada lokasi penelitian sebanyak 4 spesies yaitu Enhalus accoroides, Thalassia hemprichii, Cymodocea serullata, dan Cymodocea rotundata. Kerapatan lamun tertinggi di stasiun 2 sebanyak 132 tegakan/m2 (rapat) sedangkan stasiun 1 sebanyak 95 tegakan/m2 (agak rapat) dan stasiun 3 sebanyak 123 tegakan/m2 (agak rapat). Lamun jenis Cymodocea serullata memiliki dominansi tertinggi pada setiap stasiun. ABSTRACT : Naturally the concentration of nutrients in the waters varies for eachthe form of its compounds, including nitrates and phosphates. Seagrass plays an important role in the contribution of nutrients in waters with the result of decomposition of  seagrass litter by decomposing microorganisms. The function of the seagrass system lies in understanding the factors that govern the production and decomposition of organic matter and the efficiency of nutrient cycling in the system. This research aims to determine the content of nitrate and phosphate in sediment pore water and water columns in the seagrass beds of Prawean Coast waters Jepara and determine the type and the amount of seagrass density. This research method uses descriptive analysis. Nitrate content analysis using SNI 06-6989.31-2005 and phosphate analysis using BP2-MU-A-08. Seagrass observations using the Transect squared 50x50cm according to the LIPI guidelines. The content of nitrates sediment pore water in the seagrass beds of Prawean Coast ranges from 1,85 to 2,82 mg/l, while the content of nitrate in water column ranges from 0,63 – 1,09 mg/l. The content of phosphate in pore water ranges from 0,09 – 0,15 mg/l, while the phosphate content of the water column ranges from 0,02 to 0,04 mg/l. Four types of seagrass found were Enhalus accoroides, Thalassia hemprichii, Cymodocea serullata, and Cymodocea rotundata. The highest seagrass density at station 2 was 132 stands/m2, while the station 1 was 95 stands/m2 and station 3 was 123 stands/m2. Seagrass type Cymodocea Serullata has the highest dominance at each station.Kata Kunci :   Nitrat, Fosfat, Air Pori Sedimen, Kolom Air, Lamun.

Performance of temperature and dissolved oxygen criteria to predict habitat use by lake trout (Salvelinus namaycush)This paper is part of the series “Forty Years of Aquatic Research at the Experimental Lakes Area”.

2009 ◽  
Vol 66 (11) ◽  
pp. 2011-2023 ◽  
Author(s):  
John M. Plumb ◽  
Paul J. Blanchfield
Keyword(s):  
Habitat Use ◽  
Dissolved Oxygen ◽  
Thermal Stratification ◽  
Lake Trout ◽  
Salvelinus Namaycush ◽  
Experimental Lakes Area ◽  
Lake Volume ◽  
Northwestern Ontario ◽  
Environmental Extremes

We compared theoretical habitat volumes, determined from traditional combinations of temperature and dissolved oxygen concentration (DO) boundaries, with in situ habitat use by acoustically tagged lake trout ( Salvelinus namaycush ). The widely used criteria of 8–12 °C underestimated lake trout habitat use by 68%–80%. Instead, combined temperature (<12 or 15 °C) and DO (>4 or 6 mg·L–1) criteria most closely matched lake trout habitat use, had a similar seasonal trend as the tagged fish, suggested modest reductions (5% of total lake volume) in habitat during a warmer year, and performed best when the constraints of temperature and DO were most limiting. All data were collected in a small boreal shield lake (27 ha, zmax = 21 m) at the Experimental Lakes Area in northwestern Ontario, Canada, during two contrasting periods of thermal stratification (2003: warmer and longer; 2004: cooler and shorter), providing an assessment of observed and theoretical habitat volumes over current environmental extremes.

Accumulation and recycling of PCBs and PAHs in artificially eutrophied Lake 227

1999 ◽  
Vol 56 (4) ◽  
pp. 650-660 ◽  
Author(s):  
Jeff D Jeremiason ◽  
Steven J Eisenreich ◽  
Michael J Paterson
Keyword(s):  
Phytoplankton Community ◽  
Sediment Accumulation ◽  
Point Sources ◽  
Accumulation Rates ◽  
Experimental Lakes Area ◽  
High Accumulation ◽  
Northwestern Ontario ◽  
Polycyclic Aromatic ◽  
Contaminant Accumulation

The influence of lake trophic status on the cycling and burial of polychlorinated biphenyls (PCB's) and polycyclic aromatic hydrocarbons (PAH's) was examined in Lake 227 (L227), an artificially eutrophied lake in the Experimental Lakes Area, northwestern Ontario, Canada. Sedimentary accumulation of PCB's, PAH's, and organic carbon (OC) was determined pre- and post-eutrophication in L227 and compared with accumulation in other regional lakes. Mass and OC accumulation increased an average of 1.4 and 2.0 times, respectively, since nutrient addition began in June 1969. ΣPCB and ΣPAH sediment accumulation rates and profiles in L227 were similar to those in Lake Superior and other proximate and midlatitude lakes unimpacted by point sources. Eutrophication did not increase contaminant accumulation. In general, individual PAH accumulation rates declined following eutrophication, which coincided with similar signals elsewhere. Perylene declined markedly (4 times) since eutrophication as a result of decreased in situ formation. An increase in OC accumulation did not enhance contaminant accumulation in L227 because phytoplankton community structure shifted to species characterized by lower bioaccumulation factors, and water column recycling rates were high. Accumulation rates of mass, OC, PCB's, and PAH's, when compared with ice-free settling fluxes in 1993 and 1994, exhibited similar recycling ratios in eutrophic L227 and oligotrophic L110 due to the efficient preservation of organic matter in sediments.

Production of Epilithiphyton in Two Lakes of the Experimental Lakes Area, Northwestern Ontario

1973 ◽  
Vol 30 (10) ◽  
pp. 1511-1524 ◽  
Author(s):  
D. W. Schindler ◽  
V. E. Frost ◽  
R. V. Schmidt
Keyword(s):  
Liquid Scintillation ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Seasonal Effects ◽  
Algal Flora ◽  
Experimental Lakes Area ◽  
New Techniques ◽  
Natural Lakes ◽  
Northwestern Ontario

Two new techniques for measuring photosynthesis by benthic algal flora in waters low in dissolved inorganic carbon are described. The first uses gas chromatography to measure changes in DIC in incubation chambers directly. The second is a variation of the usual 14C procedure, in which disappearance of 14C from the water is measured by liquid scintillation instead of uptake of 14C by the algae. This procedure is simpler than measuring the uptake of 14C, because digestion and/or combustion of samples is not necessary. Results are compared with the commonly employed 14C uptake and O2 release techniques.Tests showed that heterogeneity of substrate was the major source of variation in in situ results, being large enough to make interpretation of seasonal effects and other causal factors extremely difficult.Annual production by epilithiphyton in two natural lakes in the Experimental Lakes Area (ELA) was 5.19 g C and 5.18 g C/m2 of substrate annually for lakes 239 and 240, respectively. These are the lowest values recorded for freshwater lakes at temperate latitudes.Because DIC and O2 concentrations could be measured simultaneously, it was possible to calculate photosynthetic quotients on several dates. These were extremely high, averaging 2.6 for the summer of 1971.

A novel device for in situ point measurements of fluorescent tracers in sediment pore water

2021 ◽  
Vol 148 ◽  
pp. 103827
Author(s):  
Anja Höhne ◽  
Karl Mellerowicz ◽  
Oliver Lischtschenko ◽  
Jörg Lewandowski
Keyword(s):  
Pore Water ◽  
Fluorescent Tracers ◽  
Sediment Pore Water ◽  
Novel Device
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