Aquatic Geochemistry最新文献

{"title":"The Speciation and Mobility of Mn and Fe in Estuarine Sediments","authors":"Véronique E. Oldham,&nbsp;Matthew G. Siebecker,&nbsp;Matthew R. Jones,&nbsp;Alfonso Mucci,&nbsp;Bradley M. Tebo,&nbsp;George W. Luther III","doi":"10.1007/s10498-019-09351-0","DOIUrl":"https://doi.org/10.1007/s10498-019-09351-0","url":null,"abstract":"<p>Dissolved and solid-phase speciation of Mn and Fe was measured in the porewaters of sediments recovered from three sites in the Greater St. Lawrence Estuary: the Saguenay Fjord, the Lower St. Lawrence Estuary (LSLE) and the Gulf of St. Lawrence (GSL). At all sites and most depths, metal organic ligand complexes (Mn(III)–L and Fe(III)–L) dominated the sedimentary porewater speciation, making up to 100% of the total dissolved Mn or Fe. We propose that these complexes play a previously underestimated role in maintaining oxidized soluble metal species in sedimentary systems and in stabilizing organic matter in the form of soluble metal–organic complexes. In the fjord porewaters, strong (log <i>K</i>_COND?&gt;?13.2) and weak (log <i>K</i>_COND?&lt;?13.2) Mn(III)–L complexes were detected, whereas only weak Mn(III)–L complexes were detected at the pelagic and hemipelagic sites of the GSL and LSLE, respectively. At the fjord site, Mn(III)–L complexes were kinetically stabilized against reduction by Fe(II), even when Fe(II) concentrations were as high as 57?μM. Only dissolved Mn(II) was released from the sediments to overlying waters, suggesting that Mn(III) may be preferentially oxidized by sedimentary microbes at or near the sediment–water interface. We calculated the dissolved Mn(II) fluxes from the sediments to the overlying waters to be 0.24?μmol?cm^?2?year^?1 at the pelagic site (GSL), 11?μmol?cm^?2?year^?1 at the hemipelagic site (LSLE) and 2.0?μmol?cm^?2?year^?1 in the fjord. The higher benthic flux in the LSLE reflects the lower oxygen concentrations (dO₂) of the bottom waters and sediments at this site, which favor the reductive dissolution of Mn oxides as well as the decrease in the oxidation rate of dissolved Mn(II) diffusing through the oxic layer of the sediment and its release to the overlying water.</p>","PeriodicalId":8102,"journal":{"name":"Aquatic Geochemistry","volume":"25 1-2","pages":"3 - 26"},"PeriodicalIF":1.6,"publicationDate":"2019-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s10498-019-09351-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4619378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of Hydrogeochemical Processes for Waters’ Chemical Composition and Stable Isotope Investigation of Groundwater/Surface Water in Karst-Dominated Terrain, the Upper Tigris River Basin, Turkey","authors":"E. Dişli","doi":"10.1007/s10498-019-09349-8","DOIUrl":"https://doi.org/10.1007/s10498-019-09349-8","url":null,"abstract":"<p>The Upper Tigris River Basin is one of the biggest basins in Turkey, where municipal, agricultural and industrial water supplies are highly dependent on groundwater and surface water resources. The interpretation of plots for different major ions indicates that the chemical compositions of the surface/groundwater in the Upper Tigris River Basin are dominated Ca²⁺, Mg²⁺, HCO₃^? and SO₄^2? which have been arisen largely from chemical weathering of carbonate and evaporate rock, and reverse ion exchange reactions. Isotopic composition of surface and groundwater samples is influenced by two main air mass trajectories: one originating from the Central Anatolia that is cold and rainy and another originating from the rains falling over northeastern Syria that is warm and rainy, with warm winds. The relative abundance of cations and anions in water samples is in the order: Ca^2+??&gt;?Mg^2+??&gt;?Na^+??&gt;?K⁺ for cations and HCO<span>\u0000 ^???₃\u0000 \u0000 </span>&gt;?Cl^??&gt;?SO₄^2?, respectively. Majority of the water samples are plotted on a Piper diagram showing that the chemical composition of the water samples was predominantly Ca–Mg–HCO₃ type. Groundwater and surface water have an average (Ca^2+?+?Mg²⁺/2HCO₃^?) ratio of 0.65 and 0.74, indicating no significant difference in their relative solute distribution and dissolution of carbonate rock (calcite and dolomite) predominantly by carbonic acid. The Mg²⁺/Ca²⁺ and Mg²⁺/ HCO₃^? molar ratio values are ranging from 0.21 to 1.30 and 0.11 to 0.47 for the groundwater and from 0.13 to 2.46 and 0.10 to 0.61 for the surface water samples, respectively,?indicating?that significant contribution of dolomite?dissolution has a higher advantage over limestone within the Upper Tigris River Basin.</p>","PeriodicalId":8102,"journal":{"name":"Aquatic Geochemistry","volume":"24 5-6","pages":"363 - 396"},"PeriodicalIF":1.6,"publicationDate":"2019-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s10498-019-09349-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5000980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Acknowledgement to Reviewers 2018","authors":"","doi":"10.1007/s10498-019-09348-9","DOIUrl":"https://doi.org/10.1007/s10498-019-09348-9","url":null,"abstract":"","PeriodicalId":8102,"journal":{"name":"Aquatic Geochemistry","volume":"24 5-6","pages":"397 - 397"},"PeriodicalIF":1.6,"publicationDate":"2019-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s10498-019-09348-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4895079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Detection of Biochar Carbon by Fluorescence and Near-Infrared-Based Chemometrics","authors":"Minori Uchimiya,&nbsp;Alan J. Franzluebbers,&nbsp;Zhongzhen Liu,&nbsp;Marshall C. Lamb,&nbsp;Ronald. B. Sorensen","doi":"10.1007/s10498-018-9347-9","DOIUrl":"https://doi.org/10.1007/s10498-018-9347-9","url":null,"abstract":"<p>Large-scale biochar field trials have been conducted worldwide to test for “carbon negative strategy” in the event of carbon credit and if other subsidies become enacted in the future. Once amended to the soil, biochar engages in complex organo-mineral interactions, fragmentation, transport, and other aging mechanisms exhibiting interactions with treatments including the irrigation and fertilizer application. As a result, quantitative tracing of biochar carbon relying on the routinely measured soil parameters, e.g., total/particulate organic carbon, poses a significant analytical uncertainty. This study utilized two biochar field trial sites to calibrate for the biochar carbon structure and quantity based on the infrared- and fluorescence-based chemometrics: (1) slow pyrolysis biochar pellets on kaolinitic Greenville fine sandy loam in Georgia and (2) fast pyrolysis biochar powder on Crider silt loam in Kentucky. Partial least squares-based calibration was constructed to predict the amount of solvent (toluene/methanol)-extractable fluorescence fingerprint (290/350?nm excitation and emission peak) attributed to biochar based on the comparison with the authentic standard. Near-infrared-based detection was sensitive to the C–H and C–C bands, as a function of biochar loading and the particulate organic carbon content (&lt;?53 μm) of the bulk soil. Developed chemometrics could be used to validate tarry carbon structures intrinsic to biochar additives, as the impact of biochar additives on soil chemical properties (pH, electric conductivity, and dissolved organic carbon) becomes attenuated over time.</p>","PeriodicalId":8102,"journal":{"name":"Aquatic Geochemistry","volume":"24 5-6","pages":"345 - 361"},"PeriodicalIF":1.6,"publicationDate":"2019-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s10498-018-9347-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4571183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrogeochemical Processes in a Small Eastern Mediterranean Karst Watershed (Nahr Ibrahim, Lebanon)","authors":"N. Hanna,&nbsp;B. Lartiges,&nbsp;V. Kazpard,&nbsp;E. Maatouk,&nbsp;N. Amacha,&nbsp;S. Sassine,&nbsp;A. El Samrani","doi":"10.1007/s10498-018-9346-x","DOIUrl":"https://doi.org/10.1007/s10498-018-9346-x","url":null,"abstract":"<p>Watersheds located in semiarid areas such as the eastern Mediterranean are particularly sensitive to the impact of climate change. To gain knowledge on the hydrogeochemical processes occurring in the Nahr Ibrahim watershed, a Critical Zone Observatory in Lebanon, we analyze the isotopic composition of the river water as well as the concentrations of the major ions exported (Ca²⁺, Mg²⁺, HCO₃^?, Na⁺, Cl^?, K⁺, SO₄^2?). Sampling campaigns were conducted from March 2014 to August 2016 to capture contrasting hydrological conditions. The results indicate that the carbonate lithology of the watershed is the predominant source of Ca²⁺, Mg²⁺ and HCO₃^?, whereas the low contents of Na⁺, Cl^?, K⁺, SO₄^2? mainly originate from sea spray. Except in the headwaters, the Nahr Ibrahim River is oversaturated with respect to calcite and dolomite. During wet seasons, calcite weathering and dolomite weathering contribute in an equivalent manner to the solute budget, whereas during dry seasons, calcite precipitates in the river. The isotopic composition of the river water reveals little seasonal dependency, the groundwater recharge by snowmelt infiltration leading to spring waters depleted in heavier isotopes during the dry seasons. A carbonate weathering rate of about 176?t/km²/year was determined at the outlet of the Nahr Ibrahim watershed. The calculated values of CO₂ partial pressure, on average twice the atmospheric pressure, suggest that the river is a significant source of CO₂ to the atmosphere (111?t/year).</p>","PeriodicalId":8102,"journal":{"name":"Aquatic Geochemistry","volume":"24 5-6","pages":"325 - 344"},"PeriodicalIF":1.6,"publicationDate":"2018-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s10498-018-9346-x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4567339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Potential Influence of Ocean Acidification on Deep-Sea Fe–Mn Nodules and Pelagic Clays: An Improved Assessment by Using Artificial Seawater","authors":"Quan Wang,&nbsp;Hodaka Kawahata,&nbsp;Kyoko Yamaoka,&nbsp;Atsushi Suzuki","doi":"10.1007/s10498-018-9345-y","DOIUrl":"https://doi.org/10.1007/s10498-018-9345-y","url":null,"abstract":"<p>In order to assess the potential risk of metal release from deep-sea sediments in response to pH decrease in seawater, the mobility of elements from ferromanganese (Fe–Mn) nodules and pelagic clays was examined. Two geochemical reference samples (JMn-1 and JMS-2) were reacted with the pH-controlled artificial seawater (ASW) using a CO₂-induced pH regulation system. Our experiments demonstrated that deep-sea sediments have weak buffer capacities by acid–base dissociation of surface hydroxyl groups on metal oxides/oxyhydroxides and silicate minerals. Element concentrations in the ASW were mainly controlled by elemental speciation in the solid phase and sorption–desorption reaction between the charged solid surface and ion species in the ASW. These results indicated that the release of heavy metals such as Mn, Cu, Zn and Cd should be taken into consideration when assessing the influence of ocean acidification on deep-sea environment.</p>","PeriodicalId":8102,"journal":{"name":"Aquatic Geochemistry","volume":"24 4","pages":"307 - 322"},"PeriodicalIF":1.6,"publicationDate":"2018-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s10498-018-9345-y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4593654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Uranium and Multi-element Release from Orthogneiss and Granite (Austria): Experimental Approach Versus Groundwater Composition","authors":"Daniel Elster,&nbsp;Edith Haslinger,&nbsp;Martin Dietzel,&nbsp;Heinz Fröschl,&nbsp;Gerhard Schubert","doi":"10.1007/s10498-018-9344-z","DOIUrl":"https://doi.org/10.1007/s10498-018-9344-z","url":null,"abstract":"<p>In this study, the release of elements and in particular U from five Austrian orthogneiss and granite samples into a CO₂-bearing solution was investigated to describe the initial phase (24?h) of leaching focusing on the impact of ferrous (hydro)oxide formation. Experiments were conducted at ambient temperature by flushing CO₂:N₂ gas through the reactive solution (pH_initial?~?4.3) at a liquid:solid ratio of 10:1 with and without a reducing agent. The chemical evolution of the leaching solution was dominated by incongruent dissolution of silicates showing a parabolic kinetic behavior due to protective surface formation most likely caused by precipitation of amorphous Fe^III/Al hydroxides. However, the relative distribution of Ca, Mg and Sr in the leaching solution excellently traced the individual bulk rock composition. The mobilization of U was highly prevented under oxidizing conditions by sorption onto ferrous (hydro)oxides, which were precipitating through ongoing silicate leaching. Therefore, the leaching behavior of individual U-bearing minerals was less relevant for U release. At reducing conditions, the above elements were accumulated in the solution, although an oversaturation regarding U^IVO₂ was calculated. This indicates its inhibited formation within the experimental run time. The composition of experimental leaching solutions did not reflect analyzed groundwater compositions from investigated local rock-type aquifers indicating that reaction rate constants of siliceous rocks significantly differ between values found in nature and in the laboratory. Change in active mineral surface areas with ongoing weathering, accumulation of secondary precipitates, leached layer formation and given reaction time are key factors for distinct elemental release.</p>","PeriodicalId":8102,"journal":{"name":"Aquatic Geochemistry","volume":"24 4","pages":"279 - 306"},"PeriodicalIF":1.6,"publicationDate":"2018-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s10498-018-9344-z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4668959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction to: A Tribute to Rick and Debbie Jahnke: From Deep Sea Pore Water to Coastal Permeable Sediments-Contributions that Cover the Oceans","authors":"Timothy J. Shaw,&nbsp;Steve Emerson,&nbsp;Herbert L. Windom","doi":"10.1007/s10498-018-9343-0","DOIUrl":"https://doi.org/10.1007/s10498-018-9343-0","url":null,"abstract":"","PeriodicalId":8102,"journal":{"name":"Aquatic Geochemistry","volume":"24 4","pages":"323 - 323"},"PeriodicalIF":1.6,"publicationDate":"2018-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s10498-018-9343-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4526242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reduction of Manganese Oxides: Thermodynamic, Kinetic and Mechanistic Considerations for One- Versus Two-Electron Transfer Steps","authors":"George W. Luther III,&nbsp;Aubin Thibault de Chanvalon,&nbsp;Véronique E. Oldham,&nbsp;Emily R. Estes,&nbsp;Bradley M. Tebo,&nbsp;Andrew S. Madison","doi":"10.1007/s10498-018-9342-1","DOIUrl":"https://doi.org/10.1007/s10498-018-9342-1","url":null,"abstract":"<p>Manganese oxides, typically similar to <i>δ</i>-MnO₂, form in the aquatic environment at near neutral pH via bacterially promoted oxidation of Mn(II) species by O₂, as the reaction of [Mn(H₂O)₆]²⁺ with O₂ alone is not thermodynamically favorable below pH of ~?9. As manganese oxide species are reduced by the triphenylmethane compound leucoberbelein blue (LBB) to form the colored oxidized form of LBB (<i>λ</i>_max?=?623?nm), their concentration in the aquatic environment can be determined in aqueous environmental samples (e.g., across the oxic–anoxic interface of the Chesapeake Bay, the hemipelagic St. Lawrence Estuary and the Broadkill River estuary surrounded by salt marsh wetlands), and their reaction progress can be followed in kinetic studies. The LBB reaction with oxidized Mn solids can occur via a hydrogen atom transfer (HAT) reaction, which is a one-electron transfer process, but is unfavorable with oxidized Fe solids. HAT thermodynamics are also favorable for nitrite with LBB and MnO₂ with ammonia (NH₃). Reactions are unfavorable for NH₄⁺ and sulfide with oxidized Fe and Mn solids, and NH₃ with oxidized Fe solids. In laboratory studies and aquatic environments, the reduction of manganese oxides leads to the formation of Mn(III)-ligand complexes [Mn(III)L] at significant concentrations even when two-electron reductants react with MnO₂. Key reductants are hydrogen sulfide, Fe(II) and organic ligands, including the siderophore desferioxamine-B. We present laboratory data on the reaction of colloidal MnO₂ solutions (<i>λ</i>_max?~?370?nm) with these reductants. In marine waters, colloidal forms of Mn oxides (&lt;?0.2?μm) have not been detected as Mn oxides are quantitatively trapped on 0.2-μm filters. Thus, the reactivity of Mn oxides with reductants depends on surface reactions and possible surface defects. In the case of MnO₂, Mn(IV) is an inert cation in octahedral coordination; thus, an inner-sphere process is likely for electrons to go into the empty <i>e</i><span>\u0000 ^*_g\u0000 \u0000 </span> conduction band of its orbitals. Using frontier molecular orbital theory and band theory, we discuss aspects of these surface reactions and possible surface defects that may promote MnO₂ reduction using laboratory and field data for the reaction of MnO₂ with hydrogen sulfide and other reductants.</p>","PeriodicalId":8102,"journal":{"name":"Aquatic Geochemistry","volume":"24 4","pages":"257 - 277"},"PeriodicalIF":1.6,"publicationDate":"2018-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s10498-018-9342-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5084382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Salt Crystallization Sequences of Nonmarine Brine and Their Application for the Formation of Potassium Deposits","authors":"Chuanyong Ye,&nbsp;Jianye Mao,&nbsp;Yaqiong Ren,&nbsp;Yingping Li,&nbsp;Yongjie Lin,&nbsp;Ian M. Power,&nbsp;Yangbing Luo","doi":"10.1007/s10498-018-9340-3","DOIUrl":"https://doi.org/10.1007/s10498-018-9340-3","url":null,"abstract":"<p>The salt assemblages precipitated during evaporation of concentrated brine collected from Gasikule Salt Lake (GSL) were studied to better understand the formation of potassium deposits in the Qaidam Basin. The study included isothermal evaporation at 25?°C in the laboratory and solar evaporation in the ponds at GSL field. Brines increased in density and became moderately acidic (pH?≈?5.30) while major ion geochemistry and precipitate mineralogy all showed broad agreement between both systems. Four salt assemblages were identified in the isothermal evaporation experiment: halite?→?halite?+?hexahydrite?→?halite?+?bischofite?+?carnallite?→?bischofite. Alternately, three salt assemblages were recognized in the solar evaporation: halite?→?halite?+?epsomite?+?carnallite?→?halite?+?carnallite?+?bischofite. The key difference in salt assemblages between the two systems is attributed to differences in relative humidity and temperature conditions. Although the GSL has deep spring inflow recharge, the high abundance of MgSO₄ salts demonstrates that the salt assemblages are similar to normal seawater evaporation. Thus, different proportions of deep spring inflow and river water could form both MgSO₄-deficient potassium evaporite and normal seawater potassium evaporites. Therefore, nonmarine water may form diverse potassium evaporite deposits in continental basins when the geological structure as well as hydrogeological and climatic conditions is appropriate.</p>","PeriodicalId":8102,"journal":{"name":"Aquatic Geochemistry","volume":"24 3","pages":"209 - 229"},"PeriodicalIF":1.6,"publicationDate":"2018-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s10498-018-9340-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4211580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}