scholarly journals Trace Metal Content of Sediments Close to Mine Sites in the Andean Region

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Cristina Yacoub ◽  
Agustí Pérez-Foguet ◽  
Nuria Miralles
Keyword(s):  
Trace Metal ◽  
Ecological Risk ◽  
Metal Content ◽  
Sediment Quality ◽  
Pollution Sources ◽  
Quality Analysis ◽  
Mine Site ◽  
Sediment Samples ◽  
Trace Metal Content ◽  
Mine Sites

This study is a preliminary examination of heavy metal pollution in sediments close to two mine sites in the upper part of the Jequetepeque River Basin, Peru. Sediment concentrations of Al, As, Cd, Cu, Cr, Fe, Hg, Ni, Pb, Sb, Sn, and Zn were analyzed. A comparative study of the trace metal content of sediments shows that the highest concentrations are found at the closest points to the mine sites in both cases. The sediment quality analysis was performed using the threshold effect level of the Canadian guidelines (TEL). The sediment samples analyzed show that potential ecological risk is caused frequently at both sites by As, Cd, Cu, Hg, Pb, and Zn. The long-term influence of sediment metals in the environment is also assessed by sequential extraction scheme analysis (SES). The availability of metals in sediments is assessed, and it is considered a significant threat to the environment for As, Cd, and Sb close to one mine site and Cr and Hg close to the other mine site. Statistical analysis of sediment samples provides a characterization of both subbasins, showing low concentrations of a specific set of metals and identifies the main characteristics of the different pollution sources. A tentative relationship between pollution sources and possible ecological risk is established.

Trace-metal content of Mississippi oil field brines

1990 ◽  
Vol 37 (2) ◽  
pp. 171-183 ◽  
Author(s):  
James A. Saunders ◽  
Charles T. Swann
Keyword(s):  
Trace Metal ◽  
Metal Content ◽  
Oil Field ◽  
Trace Metal Content

scholarly journals Deterministic Assessment of the Risk of Phthalate Esters in Sediments of U-Tapao Canal, Southern Thailand

Toxics ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 93
Author(s):  
Okpara Kingsley ◽  
Banchong Witthayawirasak
Keyword(s):  
Ecological Risk ◽  
Total Concentration ◽  
Phthalate Esters ◽  
Sediment Quality ◽  
Potential Ecological Risk ◽  
Concentration Addition ◽  
Sediment Samples ◽  
Mixture Effects ◽  
Quality Guidelines ◽  
Southern Thailand

This baseline study evaluated the ecological risk associated with the concentration of six common Phthalate esters (PAEs) in sediment samples collected from the U-Tapao canal in Southern Thailand. Deterministic approaches consisting of standard sediment quality guidelines (SQGs) and Risk quotient (RQ) were used to evaluate the potential ecological risk of individuals and a mixture of Phthalate esters (PAEs) detected in sediment samples. Of the 6 PAEs measured, only three, including di-n-butyl phthalate (DBP), di-2-ethyl hexyl phthalate (DEHP) and di-isononyl phthalate (DiNP), were identified and quantified. The total concentration of the 3 PAEs congeners found in the sediment samples ranged from 190 to 2010 ng/g dw. The results from the SQGs and RQ were not consistent with each other. The SQGs results for individual PAEs showed that DEHP and DBP found in sediment was estimated to cause moderate risk on benthic organisms, DiNP was not estimated due to lack of SQGs data. However, the RQ method indicated a low risk of DEHP and DBP on algae, crustacean and fish, whereas DiNP poses no risk on crustacean. Furthermore, based on the result obtained in this study, the consensus SQGs for mixture effects prove to be a more protective tool than the RQ concentration addition approach in predicting mixture effects. Despite inevitable uncertainties, the integration of several screening approaches of ecological risk assessment (ERA) can help get a more inclusive and credible result of the first tier of individuals and a mixture of these pollutants.

scholarly journals Concentrations of Essential Trace Metals in the Brain of Animal Species—A Comparative Study

2020 ◽  
Vol 10 (7) ◽  
pp. 460 ◽  
Author(s):  
Chiara Alessia DeBenedictis ◽  
Andrea Raab ◽  
Ellen Ducie ◽  
Shauna Howley ◽  
Joerg Feldmann ◽  
...  
Keyword(s):  
Nervous System ◽  
Trace Metals ◽  
Trace Metal ◽  
Metal Content ◽  
Brain Size ◽  
Physiological Role ◽  
Physiological Concentration ◽  
Specific Distribution ◽  
Trace Metal Content ◽  
The Brain

The essential trace metals iron, zinc, and copper have a significant physiological role in healthy brain development and function. Especially zinc is important for neurogenesis, synaptogenesis, synaptic transmission and plasticity, and neurite outgrowth. Given the key role of trace metals in many cellular processes, it is important to maintain adequate levels in the brain. However, the physiological concentration of trace metals, and in particular zinc, in the human and animal brain is not well described so far. For example, little is known about the trace metal content of the brain of animals outside the class of mammals. Here, we report the concentration of iron, zinc, and copper in fresh brain tissue of different model-species of the phyla Chordata (vertebrates (mammals, fish)), Annelida, Arthropoda (insects), and Mollusca (snails), using inductively coupled plasma mass-spectrometry (ICP-MS). Our results show that the trace metals are present in the nervous system of all species and that significant differences can be detected between species of different phyla. We further show that a region-specific distribution of metals within the nervous system already exists in earthworms, hinting at a tightly controlled metal distribution. In line with this, the trace metal content of the brain of different species does not simply correlate with brain size. We conclude that although the functional consequences of the controlled metal homeostasis within the brain of many species remains elusive, trace metal biology may not only play an important role in the nervous system of mammals but across the whole animal kingdom.

Trace Metal Content of Hair

1971 ◽  
Vol 23 (3) ◽  
pp. 202-207 ◽  
Author(s):  
Harold G. Petering ◽  
David W. Yeager ◽  
Sylvan O. Witherup
Keyword(s):  
Trace Metal ◽  
Metal Content ◽  
Trace Metal Content
Sign in / Sign up

Export Citation Format

Share Document