Distribution of mercury species and mercury isotope ratios in soils and river suspended matter of a mercury mining area

2018 ◽  
Vol 20 (4) ◽  
pp. 621-631 ◽  
Author(s):  
Carluvy Baptista-Salazar ◽  
Holger Hintelmann ◽  
Harald Biester
Keyword(s):  
Suspended Matter ◽  
Isotope Analysis ◽  
Isotope Ratios ◽  
Mining Area ◽  
Mercury Species ◽  
Isotope Enrichment ◽  
Heavy Isotope ◽  
Mercury Isotope ◽  
Species Transformation ◽  
Mercury Mining

Light/heavy isotope enrichment is strongly related with Hg species. Combining Hg isotope analysis and Hg speciation allows the differentiation between Hg sources and Hg species transformation in Hg contaminated areas.

Grain-size dependence of mercury speciation in river suspended matter, sediments and soils in a mercury mining area at varying hydrological conditions

2017 ◽  
Vol 81 ◽  
pp. 132-142 ◽  
Author(s):  
Carluvy Baptista-Salazar ◽  
Jan-Helge Richard ◽  
Michael Horf ◽  
Mateja Rejc ◽  
Mateja Gosar ◽  
...  
Keyword(s):  
Grain Size ◽  
Suspended Matter ◽  
Size Dependence ◽  
Mining Area ◽  
Mercury Speciation ◽  
Hydrological Conditions ◽  
Mercury Mining

Mercury Isotope Signatures of Methylmercury in Rice Samples from the Wanshan Mercury Mining Area, China: Environmental Implications

2017 ◽  
Vol 51 (21) ◽  
pp. 12321-12328 ◽  
Author(s):  
Ping Li ◽  
Buyun Du ◽  
Laurence Maurice ◽  
Laure Laffont ◽  
Christelle Lagane ◽  
...  
Keyword(s):  
Mining Area ◽  
Mercury Isotope ◽  
Environmental Implications ◽  
Rice Samples ◽  
Mercury Mining

scholarly journals A model-based assessment of the potential use of compound specific stable isotope analysis in river monitoring of diffuse pesticide pollution

2013 ◽  
Vol 10 (7) ◽  
pp. 8789-8839
Author(s):  
S. R. Lutz ◽  
H. J. van Meerveld ◽  
M. J. Waterloo ◽  
H. P. Broers ◽  
B. M. van Breukelen
Keyword(s):  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Surface Runoff ◽  
Isotope Analysis ◽  
Isotope Ratios ◽  
Strong Increase ◽  
Extreme Rainfall Event ◽  
Pesticide Application ◽  
Pesticide Pollution ◽  
Isotope Data

Abstract. Compound-specific stable isotope analysis (CSIA) has, in combination with model-assisted interpretation, proven a valuable approach to quantify the extent of organic contaminant degradation in groundwater systems. CSIA data may also provide insights into the origin and transformation of diffuse river pollutants such as pesticides and nitrate at the catchment scale. While CSIA methods for pesticides have increasingly become available, they have not yet been deployed to interpret isotope data of pesticides in surface water. We applied a coupled subsurface-surface reactive transport model (HydroGeoSphere) at the hillslope scale to investigate the usefulness of CSIA in the assessment of pesticide degradation. We simulated the transport and transformation of a pesticide in a hypothetical but realistic two-dimensional hillslope transect. The steady-state model results illustrate a strong increase of isotope ratios at the hillslope outlet, which resulted from degradation and long travel times through the hillslope during average hydrological conditions. In contrast, following an extreme rainfall event that induced overland flow, the simulated isotope ratios dropped to the values of soil water in the pesticide application area. These results suggest that CSIA can help to determine whether pesticides enter the stream via groundwater exfiltration or via surface runoff. Simulations with daily rainfall and evapotranspiration data and one pesticide application per year resulted in small seasonal variations of concentrations and isotope ratios at the hillslope outlet, which fell within the uncertainty range of current CSIA methods. This implies a good reliability of in-stream isotope data in the absence of transport via surface runoff or other fast transport routes, since the time of measurement appears to be of minor importance. The analysis of simulated isotope ratios also allowed quantifying the contribution of two different reaction pathways to the overall degradation, which gave further insight into transport routes in the modelled system. The simulations supported the use of the commonly applied Rayleigh equation for the interpretation of CSIA data, since this led to an underestimation of the real extent of degradation of less than 12% at the hillslope outlet. Overall, the model results emphasize the applicability and usefulness of CSIA in the assessment of diffuse river pollution.

scholarly journals Exploring the Utility of Compound-Specific Isotope Analysis for Assessing Ferrous Iron-Mediated Reduction of RDX in the Subsurface

2020 ◽  
Author(s):  
Yiran Tong ◽  
Matthew J. Berens ◽  
Bridget A. Ulrich ◽  
Jakov Bolotin ◽  
Jennifer H. Strehlau ◽  
...  
Keyword(s):  
Groundwater Contamination ◽  
Ferrous Iron ◽  
Chemical Reduction ◽  
Isotope Analysis ◽  
Enrichment Factors ◽  
Isotope Enrichment ◽  
Compound Specific Isotope Analysis ◽  
A Site ◽  
Mediated Reduction

This work determines isotope enrichment factors for RDX during reduction by iron minerals. The values determined are used to assess the transformation of RDX at a site with groundwater contamination and in laboratory column reactors simulating in situ chemical reduction treatment.

scholarly journals Coupling atmospheric mercury isotope ratios and meteorology to identify sources of mercury impacting a coastal urban-industrial region near Pensacola, Florida, USA

2015 ◽  
Vol 29 (10) ◽  
pp. 1689-1705 ◽  
Author(s):  
Jason D. Demers ◽  
Laura S. Sherman ◽  
Joel D. Blum ◽  
Frank J. Marsik ◽  
J. Timothy Dvonch
Keyword(s):  
Isotope Ratios ◽  
Atmospheric Mercury ◽  
Mercury Isotope ◽  
Industrial Region

Measurement of heavy isotope enrichment in tropospheric ozone

1995 ◽  
Vol 22 (13) ◽  
pp. 1713-1716 ◽  
Author(s):  
D. Krankowsky ◽  
F. Bartecki ◽  
G. G. Klees ◽  
K. Mauersberger ◽  
K. Schellenbach ◽  
...  
Keyword(s):  
Tropospheric Ozone ◽  
Isotope Enrichment ◽  
Heavy Isotope

scholarly journals Stable Isotope Enrichment (Δ15N) in the Predatory Flower Bug (Orius majusculus) Predicts Fitness-Related Differences between Diets

Insects ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 255
Author(s):  
Marta Montoro ◽  
Per M. Jensen ◽  
Lene Sigsgaard
Keyword(s):  
Diet Quality ◽  
Isotopic Ratio ◽  
Isotope Analysis ◽  
Mass Rearing ◽  
Isotope Enrichment ◽  
Orius Majusculus ◽  
Food And Feed ◽  
The Difference ◽  
Biochemical Analyses ◽  
Δ15n And Δ13c

Mass rearing of insects, used both as biological control agents and for food and feed, is receiving increasing attention. Efforts are being made to improve diets that are currently in use, and to identify alternative diets, as is the case with the predatory flower bug (Orius majusculus) and other heteropteran predators, due to the high costs of their current diet, the eggs of the Mediterranean flour moth (E. kuehniella). The assessment of alternative diets may include measurements of the predator’s fitness-related traits (development time, weight, etc.), and biochemical analyses such as lipid and protein content in the diet and the insects. However, assessing diet quality via the predator’s fitness-related traits is laborious, and biochemical composition is often difficult to relate to the measured traits. Isotope analysis, previously used for diet reconstruction studies, can also serve as a tool for the assessment of diet quality. Here, the variation in discrimination factors or isotope enrichment (Δ15N and Δ13C) indicates the difference in isotopic ratio between the insect and its diet. In this study, we investigated the link between Δ15N and diet quality in the predatory bug Orius majusculus. Three groups of bugs were fed different diets: Ephestia kuehniella eggs, protein-rich Drosophila melanogaster and lipid-rich D. melanogaster. The isotopic enrichment and fitness-related measurements were assessed for each group. Results show a relation between Δ15N and fitness-related measurements, which conform to the idea that lower Δ15N indicates a higher diet quality.

scholarly journals Speciation of methylmercury in rice grown from a mercury mining area

2010 ◽  
Vol 158 (10) ◽  
pp. 3103-3107 ◽  
Author(s):  
Lu Li ◽  
Feiyue Wang ◽  
Bo Meng ◽  
Marcos Lemes ◽  
Xinbin Feng ◽  
...  
Keyword(s):  
Mining Area ◽  
Mercury Mining

scholarly journals Potential Reference Materials for Hematite Oxygen Isotope Analysis

Minerals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 987
Author(s):  
Lianjun Feng ◽  
Hongwei Li ◽  
Tiejun Li
Keyword(s):  
Oxygen Isotope ◽  
Iron Oxides ◽  
Oxygen Isotopes ◽  
Reference Materials ◽  
Isotope Composition ◽  
Isotope Analysis ◽  
Isotope Ratios ◽  
Bulk Rock ◽  
Accurate Analysis ◽  
Oxygen Isotope Ratios

Hematite is a potential mineral for reconstructing the oxygen isotope composition and paleotemperature of paleowater. A highly accurate analysis of oxygen isotopes is essential. However, relative to other oxygenated minerals, we lack hematite reference materials that allow for internationally comparable analyses between different laboratories. To address this issue, we attempted to perform bulk rock oxygen isotope analysis on five hematite reference materials (GBW07223a, GBW07825, YSBC28740-95, YSBC28756-2008, Harvard 92649). Meanwhile, the oxygen isotope ratios of iron oxides (GBW07223a, GBW07825, YSBC28740-95, YSBC28756-2008) were obtained by mass balance involving other oxygen-bearing minerals such as quartz and silicates. In addition, the oxygen isotope ratios of iron oxides in an oolitic hematite (ca. 1.65 billion years ago) are consistent with the results of previous analyses of this class of minerals.

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