نتایج جستجو برای: geochemical indices
تعداد نتایج: 94781 فیلتر نتایج به سال:
Sediment samples were collected from 8 sites in the northern areas of Qeshm Island, Iran to determine the total and partial concentrations of heavy metals including copper (Cu), lead (Pb), nickel (Ni), cadmium (Cd), and Iron (Fe), in February 2016. A combination of nitric acid and perchloric acid was used to determine the total concentrations and sequential extraction method was used to analyze...
A novel approach to the evolution of organisms is given. It asserts that biological evolution was consequential upon geochemical, environment, change and was inevitable not accidental.
identification of mineralization features and deep geochemical anomalies using a new ft-pca approach
the analysis of geochemical data in frequency domain, as indicated in this research study, can provide new exploratory informationthat may not be exposed in spatial domain. to identify deep geochemical anomalies, sulfide zone and geochemical noises in dalli cu–au porphyry deposit, a new approach based on coupling fourier transform (ft) and principal component analysis (pca) has beenused. the re...
Iranian Cenozoic magmatic belt, known as Urumieh-Dokhtar, is recognized as an important polymetallic mineralization which hosts porphyry, epithermal, and polymetallic skarn deposits. In this regard, multivariate analyses are generally used to extract significant anomalous geochemical signature of the mineral deposits. In this study, stepwise factor analysis, cluster analysis, and concentration–...
At present, the challenge for geochemical prospecting of deep-sea, rare, earth-rich sediments is selection exploration sites. Because unpredictability offshore operations, distribution and survey line stations face great challenges. In this paper, we study fact that concentration geochemistry in space may be a part special complex process, which called multifractal. It requires large number ind...
The aim of this study was to provide, for the first time, data on concentration potentially toxic elements (PTEs) in soils and bulbs elephant garlic (Allium ampeloprasum L.) cultivated Valdichiana, a traditional agricultural area Tuscany, Italy. Bulbs soil samples were collected four cultivation fields analyzed by inductively coupled plasma-mass spectrometry (ICP-MS) determine concentrations As...
The consumption of heavy metals through the ingestion food is a growing concern in developing countries where monitoring environmental content has not been given desired attention. This research work aims at determining public health risks and safety farm products terms their residual metal burdens from five subsistence farmlands Akinyele area. Analysis concentrations Cd, Cu, Cr, Pb, Fe, Zn soi...
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