An alternative, low cost method for analyzing mercury in soil, sediment and gold mining residues was developed, optimized and applied to 30 real samples. It is semiquantitative, performed using an acid extraction pretreatment step, followed by mercury reduction and collection in a detecting paper containing cuprous iodide. A complex is formed with characteristic color whose intensity is proport...

BACKGROUND The Navajo Nation suffers from a legacy of environmental pollution from historical uranium mining activities, resulting in adverse public health outcomes and continuous exposure. OBJECTIVE Partner with a Navajo graduate student and community members in a field campaign to characterize the spatial distribution and geochemistry of uranium for a multipathway uranium exposure assessmen...

EPA Agreement Number: R829515C003 Center Name and Institution of Center Director: Rocky Mountain Regional Hazardous Substance Research Center, Colorado State University, Fort Collins, Colorado Identifier used by Center for Project: Project 1 Title of Project: Redox Transformations, Complexation and Soil/Sediment Interactions of Inorganic Forms of As and Se in Aquatic Environments: Effects of Na...

The bioavailability of nutrients in sediments is one of the most important factors controlling ecological and physiological processes in the mangrove ecosystem (Alongi et al. 2002; Feller et al. 2002; Cheeseman & Lovelock 2004; Krauss et al. 2008). Although mangroves are highly productive, they are generally nutrient-deficient, relying on microbial and plant cycling processes for nutrients (Hol...

New occurrences of free gold were identified during fieldwork at outcrops located in the western part of the Castro Basin, state of Paraná. These are associated with silicified and sulfide-rich zones in hydrothermally-altered volcanic rocks. The aerogeophysical data indicate that the areas of the new targets show high K and eU relative to eTh, suggesting intense hydrothermal alteration. The str...

P.G. Eriksson, D. Twist, C.P. Snyman and L. Burger 454 The setting of mineralization in a portion of the Eersteling goldfield, Pietersburg granite-greenstone terrane, South Africa C.L. Byron and J.M. Barton 463 Siesmicity and plate boundary evolution in southeastern Africa CJ.HHartnady 473 Geology, geochemistry and mineralisation of the Erongo Volcanic Complex, Namibia F. Pirajno 485 Clay miner...

The purpose of this study is to understand mineral diagenesis authigenic mineral and the effect of climate on mineral of Pleistocene-Holocene sediment deposits in the Southern Kenya Rift. Lake Magadi unique geologic settings are characterized by extreme alkalinity and high silica activities. The mineralogical analysis was achieved by X-Ray diffraction (XRD) and Scanning Electron Microscopy (SEM...

A primary sewage treatment plant discharges its effluents into Butler Ditch, Oak Openings, Lucas County, Ohio. A marsh habitat near the discharge outlet, high turbidity, sludge covering the stream bed and pungent odor gave reason to believe that the effluent from the sewage treatment plant contaminated the ditch. Water and stream sediment samples were collected from 24 sample locations over a 2...

Abstract Continental depositional environments preserve the majority of the macrofloral record since the advent of land-plant colonization in the mid-Paleozoic, and wetland representatives are encountered more commonly than those that grew under more seasonal conditions. It has been assumed that preservation potential and future recovery of plant debris are high once detritus is introduced into...