scholarly journals Risks Associated of the Waters from Hydric Systems Urban`s. The case of the rio Barigui, south of Brazil

2017 ◽  
Vol 68 (8) ◽  
pp. 1834-1842 ◽  
Author(s):  
Paulo Roberto Bairros Da Silva ◽  
Cleyton Nascimento Makara ◽  
Ana Paula Munaro ◽  
Danielle Caroline Schnitzler ◽  
Daniel Constantin Diaconu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Natural Waters ◽  
Water System ◽  
Chemical Species ◽  
Total Alkalinity ◽  
Nutrient Concentrations ◽  
Chemical Availability ◽  
South Of Brazil ◽  
Physical And Chemical

The quantification of a chemical species isolated in natural waters does not allow the characterization of it as an environmental stressor. Therefore, it is necessary to associate different lines of research that allows the evaluation of risk on the water system. In this perspective, this study carries out approaches based on distinct research lines, allowing physical and chemical quantification in situ, determination of nutrient concentrations, chlorophyll-a, total alkalinity and metallic species (Cu, Ni, Fe, Cr, Zn and Pb). In addition, the dissolved organic matter was evaluated by means of spectrophotometric techniques and testing of acute toxicity with the organism Artemia sp. and Daphnia magna in water samples from the Barig�i River, southern Brazil. The results point to the existence of degradation processes and the input of organic matter that are affecting the dynamics of the species, influencing their chemical availability and toxicity in the water system.

Determination of the Mercury Complexation Characteristics of Dissolved Organic Matter in Natural Waters with “Reducible Hg” Titrations

2003 ◽  
Vol 37 (15) ◽  
pp. 3316-3322 ◽  
Author(s):  
Carl H. Lamborg ◽  
Chun-Mao Tseng ◽  
William F. Fitzgerald ◽  
Prentiss H. Balcom ◽  
Chad R. Hammerschmidt
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Natural Waters

Determination of Chemical Species in MDEA – Carbon Dioxide – Water System by Raman Spectroscopy

2015 ◽  
Vol 1113 ◽  
pp. 261-266 ◽  
Author(s):  
Humbul Suleman ◽  
Muhammad Zubair Shahid ◽  
Abdulhalim Shah Maulud ◽  
Zakaria Man ◽  
Mohammad Azmi Bustam Khalil
Keyword(s):  
Carbon Dioxide ◽  
Raman Spectroscopy ◽  
Chemical Speciation ◽  
Water System ◽  
Chemical Species ◽  
Principal Component Regression ◽  
Principal Component ◽  
Carbon Dioxide Absorption

Alkanolamines based carbon dioxide absorption from flue gases remains the most industrially implemented technique. The effective design of absorbers and associated equipment requires robust thermodynamic and kinetic models thus, instigating research efforts in chemical speciation and characterization of CO2loaded alkanolamine solutions. In this study, the potential of Raman spectroscopy has been investigated to determine the in situ chemical speciation in MDEA – CO2– Water system. The Raman spectra have been fitted to thermodynamic values using principal component regression. Results are in good agreement for carbonate, bicarbonate, MDEA and protonated MDEA chemical species.

Simple and simultaneous determination of glutathione, thioacetamide and refractory organic matter in natural waters by DP-CSV

2013 ◽  
Vol 463-464 ◽  
pp. 997-1005 ◽  
Author(s):  
Benoît Pernet-Coudrier ◽  
Matthieu Waeles ◽  
Montserrat Filella ◽  
François Quentel ◽  
Ricardo D. Riso
Keyword(s):  
Organic Matter ◽  
Simultaneous Determination ◽  
Natural Waters ◽  
Refractory Organic Matter

Optimization of conditions for the determination of the organic matter content of waters by reagentless oxithermography and its application to the analysis of natural waters

2016 ◽  
Vol 71 (10) ◽  
pp. 1022-1027 ◽  
Author(s):  
I. V. Rogovaya ◽  
B. K. Zuev ◽  
T. V. Titova ◽  
S. V. Morzhukhina ◽  
A. E. Saraeva ◽  
...  
Keyword(s):  
Organic Matter ◽  
Natural Waters ◽  
Organic Matter Content ◽  
Matter Content

scholarly journals Trace metal speciation predictions in natural aquatic systems: incorporation of dissolved organic matter (DOM) spectroscopic quality

2012 ◽  
Vol 9 (4) ◽  
pp. 356 ◽  
Author(s):  
Kristin K. Mueller ◽  
Stephen Lofts ◽  
Claude Fortin ◽  
Peter G. C. Campbell
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Trace Metal ◽  
Metal Binding ◽  
Natural Waters ◽  
Metal Speciation ◽  
Chemical Species ◽  
Metal Species ◽  
Fluorescence Measurements ◽  
Shield Lakes

Environmental contextTo assess the risk posed by environmental contaminants such as metals, one needs to be able to identify the key chemical species that prevail in natural waters. One of the recognised stumbling blocks is the need to quantify the influence of heterogeneous dissolved organic matter (DOM). Here we explore the possibility of using the optical signature of DOM to determine its quality, to alleviate the need to make assumptions about its metal-binding properties and to improve the prediction of trace metal species distributions in natural waters. AbstractTo calculate metal speciation in natural waters, modellers must choose the proportion of dissolved organic matter (DOM) that is actively involved in metal complexation, defined here as the percentage of active fulvic acid (FA); to be able to estimate this proportion spectroscopically would be very useful. In the present study, we determine the free Cd2+, Cu2+, Ni2+ and Zn2+ concentrations in eight Canadian Shield lakes and compare these measured concentrations to those predicted by the Windermere Humic Aqueous Model (WHAM VI). For seven of the eight lakes, the measured proportions of Cd2+ and Zn2+ fall within the range of values predicted by WHAM; the measured proportion of Cu2+ falls within this range for only half of the lakes sampled, whereas for Ni, WHAM systematically overestimated the proportion of Ni2+. With the aim of ascribing the differences between measured and modelled metal speciation to variations in DOM quality, the percentage of active FA needed to fit modelled and measured free metal concentrations was compared with the lake-to-lake variation in the spectroscopic quality of the DOM, as determined by absorbance and fluorescence measurements. Relationships between the percentage of active FA and DOM quality were apparent for Cd, Cu, Ni and Zn, suggesting the possibility of estimating the percentage of active FA spectroscopically and then using this information to refine model predictions. The relationships for Ni differed markedly from those observed for the other metals, suggesting that the DOM binding sites active in Cd, Cu and Zn complexation are different from those involved in Ni complexation. To our knowledge, this is the first time that such a distinction has been resolved in natural water samples.

scholarly journals Restoration of Soil Physical and Chemical Properties of Abandoned Tin- Mining in Bangka Belitung Islands

2017 ◽  
Vol 22 (1) ◽  
pp. 21-28 ◽  
Author(s):  
Ishak Yuarsah ◽  
Etik Puji Handayani ◽  
. Rakhmiati ◽  
. Yatmin
Keyword(s):  
Organic Matter ◽  
Chemical Properties ◽  
Soil Improvement ◽  
Environmental Damage ◽  
Top Soil ◽  
Conservation Technology ◽  
Legume Cover Crop ◽  
Physical And Chemical ◽  
High Soil Temperature

The practices of tin mining which removing all layers of soil on deposits of minerals caused the seriously environmental problems, i.e degradation of physical and chemical soil, disappearance of vegetation, flora and fauna in ecosystems that changed the microclimate. In the tailings area of tin mining have unstable structure, the content of organic matter is very low, so it is vulnerable to land slides and erosion. The characteristic of tailing area that very acid, low nutrient availability, low water storage and high soil temperature are constraints in the conservation and improvement this area. The aim of this research was found conservation technology to improve the properties of  soil on Tin mining land due to human activities that cause environmental damage both micro and macro so determination of plant species and specific location technology can be done based on characterization and potential evaluation soil resources. Annual crop cultivation and cultivation of legume cover crop (Mucuna sp., Long-lived, Calopogonium sp., Peuraria javanica) and management of top soil and organic matter are a must, in addition to improve soil structure, maintaining soil moisture, as well as to reduce the loss nutrients, as in  textured rough soil (sandy) nutrients in soil are easily washed.Keywords: Characteristic soil, improvement, tailing area, tin mining

scholarly journals Interference of dissolved organic matter and its constituents on the accurate determination of hydrogen peroxide in water

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jianbiao Peng ◽  
Ya Zhang ◽  
Jianhua Li ◽  
Xinan Wu ◽  
Mengjie Wang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Natural Waters ◽  
Accurate Determination ◽  
Quantitative Structure Activity Relationship ◽  
Relationship Model ◽  
Order Of Magnitude ◽  
20 Nm

AbstractHydrogen peroxide (H2O2) is ubiquitous in natural waters, and plays an important role in both biological and chemical processes. This study investigated the influence of dissolved organic matter (DOM) and its substituents on the accurate measurement of H2O2 by peroxidase-mediated depletion of scopoletin fluorescence method which is one of the most widely used methods for the determination of low concentration H2O2 in water. Six DOM and its 24 substituents interfered the determination of H2O2 at environmentally relevant concentration of 200 nM with different levels except 2,6-dimethoxy-1,4-benzoquinone and benzoic acid, which may be associated with origin and types of DOM, and numbers and position of active functional groups in DOM constituents. Each substance concentration and the corresponding decreasing ratio to the measured H2O2 concentration was fitted well to the linear model (R2 > 0.9), and the obtained interfering ratios (k, (mgC L−1)−1), expressing the degree of DOM or its substituents per unit concentration to the measurement of H2O2, were approximate for DOM, but the order of magnitude of k values of DOM constituents took on a large span from 10–3 to 10–7. When DOM levels exceed 0.1 mgC L−1 or its substituent concentration is at nM level (low to 20 nM), the H2O2 content will be underestimated substantially. A quantitative structure–activity relationship model with remarkable stability and strong predictability for the k of DOM substituents to H2O2 measurement was established, and the k was related to the electron transfer capacity, hydrophobicity and stability of these compounds.

Microbial Responses to Trace Elements and Nutrients in the St. Lawrence River

1986 ◽  
Vol 21 (4) ◽  
pp. 513-523
Author(s):  
S.S. Rao ◽  
A. Mudroch
Keyword(s):  
Trace Elements ◽  
Organic Matter ◽  
Chemical Species ◽  
Bacterial Density ◽  
Toxic Substances ◽  
Lake Bottom ◽  
Microbial Responses ◽  
High Concentrations ◽  
St Lawrence River

Abstract Over 100 surface sediment samples from Lac St. Louis (St. Lawrence River) were examined for various microbial physiological types and densities. These organisms were correlated to the concent rat ions of trace elements (Ni, Co, Cr, V, Cu, Pb, Zn, As, Fe, Mn and Ti) and nutrients (P and organic matter). Results indicated a relationship between bacterial densities and trace element concentrations. Data also suggested there was an apparent indication of bacterial inhibit ion due to toxic substances in the lake sediment. Generally, high and low bacterial density zones existed in the sediment with low bacterial density zones being associated with high concentrations of trace elements. Because of the relationships and the distribution of trace elements and organic matter, the lake bottom exhibited a heterogeneous nature. The availability of trace elements in the surface sediments was assessed by determination of chemical species of the trace elements in solutions obtained by elutriation of the sediment with distilled water. Data and methodology are presented.

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