Aquatic Geochemistry
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A Comparison of Fluvial Sediment Phosphorus (P) Chemistry in Relation to Location and Potential to Influence Stream P Concentrations
Aquatic Geochemistry - Tập 7 - Trang 255-265 - 2001
Fluvial sediments are subject to cyclic submersion during changes in stream flow, which can affect their phosphorus (P) sorptive capacity. As fluvial sediments play a major role in determining P concentrations in stream flow, we compared the P chemistry of exposed stream bank and submerged bed sediments from an agricultural catchment in central Pennsylvania, USA. Total P concentration was greater ...... hiện toàn bộ
A Brine Evolution Model and Mineralogy of Chemical Sediments in a Volcanic Crater, Lake Kitagata, Uganda
Aquatic Geochemistry - Tập 17 - Trang 129-140 - 2010
Lake Kitagata, Uganda, is a hypersaline crater lake with Na–SO4–Cl–HCO3–CO3 chemistry, high pH and relatively small amounts of SiO2. EQL/EVP, a brine evaporation equilibrium model (Risacher and Clement 2001), was used to model the major ion chemistry of the evolving brine and the order and masses of chemically precipitated sediments. Chemical sediments in a 1.6-m-long sediment core from Lake Kitag...... hiện toàn bộ
Impact of a Fluorine-Rich Granite Intrusion on Levels and Distribution of Fluoride in a Small Boreal Catchment
Aquatic Geochemistry - Tập 18 - Trang 77-94 - 2012
This paper explores the influence of a fluorine-rich granite on fluoride concentration in a small boreal catchment in northern Europe. The materials include stream water and shallow groundwater sampled in spatial and temporal dimensions, and analytical data on fluoride and a number of ancillary variables. Fluoride increased strongly towards the lower reaches of the catchment—at the stream outlet t...... hiện toàn bộ
Determining Biogenic Silica in Marine Samples by Tracking Silicate and Aluminium Concentrations in Alkaline Leaching Solutions
Aquatic Geochemistry - Tập 8 - Trang 37-67 - 2002
This study introduces an alkaline leaching technique for the simultaneous analysis of biogenic silica and aluminium in sediments. Measuring aluminium facilitates the discrimination between silica from the biogenic (BSiO2) and the non-biogenic fraction, because it originates almost solely from the lithogenic phase. The method was tested using fine-grained silicagel, standard clay minerals, artifici...... hiện toàn bộ
Oxyanion Concentrations in Eastern Sierra Nevada Rivers – 2. Arsenic and Phosphate
Aquatic Geochemistry - Tập 3 - Trang 61-97 - 1997
Water samples were collected from the Truckee River-Pyramid Lake system, the Walker River-Walker Lake system, and the Carson River, all located in eastern California and western Nevada, U.S.A., at three different times (i.e., summer 1991, spring 1992, and autumn 1992) over a two year period. The concentrations of As, Na, Cl, ΣPO4, and pH were measured in these river samples and the associated term...... hiện toàn bộ
Sử Dụng Nhiệt Độ Như Một Chỉ Báo Để Xem Xét Sự Trao Đổi Giữa Sediment–Water Trong Các Sediment Cát Ở Giữa Kệ Lục Địa Dịch bởi AI
Aquatic Geochemistry - Tập 22 - Trang 419-441 - 2016
Sự trao đổi chất lỏng qua bề mặt sediment–water trong một môi trường kệ lục địa cát đã được nghiên cứu bằng cách sử dụng nhiệt độ như một chỉ báo. Sự dao động thủy triều vào mùa hè của các mặt nhiệt độ cắt ngang trên kệ Nam Đại Tây Dương đã cung cấp một tín hiệu đủ mạnh tại bề mặt sediment–water để theo dõi sự vận chuyển nhiệt bằng đối lưu và dẫn nhiệt vào và ra khỏi lòng biển, cho thấy sự xả thải...... hiện toàn bộ
Dissolution Rates of Actinolite in Water and Its Modified Mineral Surface Across the Critical State
Aquatic Geochemistry - Tập 23 Số 3 - Trang 165-183 - 2017
Hydrochemical Groundwater Evolution in the Bunter Sandstone Sequence of the Odenwald Mountain Range, Germany: A Laboratory and Field Study
Aquatic Geochemistry - Tập 17 - Trang 165-193 - 2011
Field and laboratory investigations were performed to identify the principal mechanisms of the hydrochemical groundwater evolution among low mineralised groundwater in the Triassic Bunter sandstone aquifer of the Odenwald low mountain range, central Germany. Hydrochemical composition comprises low pH, SO4-rich shallow groundwaters issued by springs (Ca-Mg-SO4-type) grading to SO4-poor deep groundw...... hiện toàn bộ
Speciation of Trace Elements in Acidic PoreWaters from Waste Rock Dumps by Ultrafiltration andIon Exchange Combined with ICPMS and ICPOES
Aquatic Geochemistry - Tập 6 - Trang 347-366 - 2000
A speciation procedure developed on reactive acidicpore water samples from mining areas is presented.Methods with low consumption of solution are requiredthat allow rapid sample preparation to avoid equilibriumchanges as far as possible. The entire procedure includesonly three parallel separation steps. One aliquot is filteredthrough an 1 kd ultrafiltration membrane to separate traceelements adsor...... hiện toàn bộ
Carbon-Nitrogen-Phosphorus Cyclingin Tomales Bay, California
Aquatic Geochemistry - Tập 4 - Trang 395-402 - 1998
Tomales Bay, California, has been the site oflong-term study of carbon-nitrogen-phospho-rus fluxes in the coastal zone. It has also one of severalcoastal sites being used for comparison of C-N-Pbiogeochemical fluxes. The site releases phosphorusand consumes dissolved nitrogen. It also producesdissolved inorganic carbon, mostly as elevatedalkalinity. The overall interpretation placed on thebiogeoch...... hiện toàn bộ
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