Influence of Temperature on the Removal of Extremely High Concentration p‐Nitrophenol Simulated Wastewater by Fe/Cu/H2O Systems          下载免费PDF全文

Bo Lai  Dong‐Hai Yuan  Zhao‐Yu Chen  Yue Yuan  Ping Yang 《洁净——土壤、空气、水》2016,44(4):345-355

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Evaluation of Dye Adsorption Onto SBA‐15 Using Image Analysis          下载免费PDF全文

Aleksandra R. Nesic  Maja J. Kokunesoski  Sladjana S. Meseldzija  Tatjana D. Volkov‐Husovic  Antonije E. Onjia 《洁净——土壤、空气、水》2016,44(10):1323-1328

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Phosphorus Runoff Losses After Application of Organic Waste          下载免费PDF全文

Marta García‐Albacete  María Isabel Requejo  María Carmen Cartagena 《洁净——土壤、空气、水》2016,44(12):1628-1635

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Contrasting Phytoplankton Structure and Morphologically Based Functional Groups of Reservoirs That Differ in the Adjacent Surrounding          下载免费PDF全文

Elżbieta Wilk‐Woźniak  Judita Koreivienė  Jūratė Karosienė  Agnieszka Pociecha  Magdalena Strzesak  Wojciech Mróz 《洁净——土壤、空气、水》2016,44(6):638-647

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Characterization of Dissolved Organic Matter in Lake Baiyangdian Using Spectroscopic Techniques and Multivariate Statistical Analysis          下载免费PDF全文

Jun Cui  Dong‐hai Yuan  Xu‐jing Guo  Lian‐sheng He  Jiang‐wei He  Hai‐yan Li  Jun‐qi Li 《洁净——土壤、空气、水》2016,44(11):1444-1452

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Equilibrium Modeling of Arsenic Adsorption in a Ternary Arsenic–Iron Oxide–Natural Organic Matter System          下载免费PDF全文

Hoda Fakour  Tsair‐Fuh Lin  Shang‐Lien Lo 《洁净——土壤、空气、水》2016,44(10):1287-1295

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Transparent Exopolymer Particles (TEP) in a River-Dominated Estuary: Spatial–Temporal Distributions and an Assessment of Controls upon TEP Formation     

Michael S. Wetz  Meredith C. Robbins  Hans W. Paerl 《Estuaries and Coasts》2009,32(3):447-455

Transparent exopolymer particle (TEP) distributions were examined in North Carolina’s Neuse River Estuary (NRE) over a 1-year period, and experiments were conducted to examine controls upon TEP formation. TEP-carbon averaged 16% of the total organic carbon pool in the NRE. From May to early August 2007, TEP ranged from 805 to 1,801 μg xanthan gum (XG) L⁻¹. A large phytoplankton bloom peaked in early August and then subsequently declined. Within 2 weeks of the bloom’s peak, TEP concentrations increased to >3,500 μg XG L⁻¹ and remained elevated through mid-December. Decreasing water temperatures and enhanced retention due to drought conditions in Fall 2007 likely aided in the persistence of TEP concentrations during this timeframe. Thereafter, TEP decreased coincident with increased river flow and flushing of the estuary that began in January 2008, and TEP remained low (ranging from 991 to 1,712 μg XG L⁻¹) until the end of April 2008. TEP was positively correlated with salinity, suggesting that cation availability (which co-varies with salinity and stabilizes the structural integrity of TEP) may play a role in estuarine TEP formation. In two cation addition experiments using water from the mesohaline region, TEP concentrations tended to be higher in treatments with vs. without cations added. Statistically significant relationships were also found between in situ TEP concentrations and pH, mixing, and temperature, suggesting that a complex suite of environmental parameters affect TEP formation and its distribution in estuaries.  相似文献   

Quartz as indicator mineral in the Central Swiss Alps: the quartz recrystallization isograd in the rock series of the northern Aar massif     

Hans Ulrich Bambauer  Marco Herwegh  Herbert Kroll 《Swiss Journal of Geoscience》2009,102(2):345-351

Earlier observations on the deformation of rock-forming quartz during Alpine metamorphism that were made by Voll (1976) along a traverse following the Reuss valley (Aar massif, Central Swiss Alps) are still relevant but can be explained in more modern term. Voll found that a few kilometres south of the contact between the Aar massif and its sedimentary cover quartz has partly undergone a combination of dynamic recrystallization and nucleation along grain boundaries and fractures at the expense of the deformed parent grains. Further to the south, increasing grain growth of quartz under nearly static conditions is observed, with polygonal grain shapes typical of annealed microfabrics. Comparable stages of recrystallization could be found in several N–S traverses through the Aar massif so that “points of first occurrence” of newly formed quartz could be connected to define a quartz recrystallization isograd. This isograd extents over 90 km through the northern Aar massif, following a course parallel to the sanidine/microcline isograd but at a distance of 10–15 km further to the north. The evolution of the quartz microfabric is discussed with respect to recent estimates of the T-t path of the Aar massif.  相似文献   

Simultaneous Determination of Fluorine,Chlorine, Bromine and Iodine in Six Geochemical Reference Materials Using Pyrohydrolysis,Ion Chromatography and Inductively Coupled Plasma‐Mass Spectrometry     

Hélène Balcone‐Boissard  Agnès Michel  Benoît Villemant 《Geostandards and Geoanalytical Research》2009,33(4):477-485

Concentrations of halogens (fluorine, chlorine, bromine and iodine) were determined in six geochemical reference materials (BHVO‐2, GS‐N, JG‐1, JR‐1, JB‐1b, JB‐2). Halogens were first extracted from powdered samples using a pyrohydrolysis technique, then hydrolysis solutions were analysed by ion chromatography for F and Cl and inductively coupled plasma‐mass spectrometry for Br and I. The detection limits in solutions were 100 μg l^?1 for both F and Cl and 10 ng l^?1 for Br and I. Considering the extraction procedure, performed on a maximum of 500 mg of sample and producing 100 ml of pyrohydrolysis solution, detection limits in rock samples were 20 mg kg^?1 for F and Cl and 2 μg kg^?1 for Br and I. The mean analytical errors on the studied composition ranges were estimated at 10 mg kg^?1 for F and Cl, 100 μg kg^?1 for Br and 25 μg kg^?1 for I. The concentration values, based on repeated (generally > 10) sample analysis, were in good agreement generally with published values and narrowed the mean dispersion around mean values. Large dispersions are discussed in terms of samples heterogeneity and contaminations during sample preparation. Basaltic RMs were found to be more suitable for studies of halogen compositions than differentiated rock material, especially granites – the powders of which were heterogeneous in halogens at the 500 mg level.  相似文献   

Using subsurface metazoan fauna to indicate groundwater–surface water interactions in the Nakdong River floodplain, South Korea     

Jörg Bork  Sven E. Berkhoff  Sabine Bork  Hans Jürgen Hahn 《Hydrogeology Journal》2009,17(1):61-75

Hydrological interactions between surface water and groundwater (GW) can be described using hydrochemical and biological methods. Surface water–groundwater interactions and their effects on groundwater invertebrate communities were studied in the Nakdong River floodplain in South Korea. Furthermore, the GW-Fauna-Index, a promising new index for assessing the strength of surface-water influence on groundwater, was tested. The influence of surface water on groundwater decreased with increasing depth and distance from the river. While hydrochemistry prevailingly reflected the origin of the waters in the study area (i.e. whether alluvial or from adjacent rock), faunal communities seemed to display an affinity to surface-water intrusion. Fauna reacted quickly to changes in hydrology, and temporal changes in faunal community structure were significantly linked to the hydrological situation in the floodplain. The metazoan faunal community and the GW-Fauna-Index allow a distinction between surface and subsurface waters with varying degrees of exchange. The results indicate that hydrological conditions are reflected by faunal assemblages on a high spatiotemporal resolution, and that surface-water intrusion can be estimated using the GW-Fauna-Index.  相似文献