Geological Environment and Engineering
Farah Rahmani; Abdolreza Jafarian; Razieh Lak; Javad Esmaeili
Abstract
The present study aims to determine the concentration of heavy metals and toxic metalloids in rice of Sari paddy fields in the Mazandaran province of Iran. In this study, sampling was performed from 32 stations of the rice seed section. The soil-plant relationship was investigated in 6 stations using ...
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The present study aims to determine the concentration of heavy metals and toxic metalloids in rice of Sari paddy fields in the Mazandaran province of Iran. In this study, sampling was performed from 32 stations of the rice seed section. The soil-plant relationship was investigated in 6 stations using samples taken from rice soil and other plant parts such as roots, stems, leaves, and bran. Soil and plant samples were prepared using ICP-OES and ICP-MS methods, respectively, and then analyzed chemically. The results of the chemical analysis of rice samples showed that the mercury (Hg) concentration is usually about 0.07 ppm. However, it reaches about 0.09 ppm in some points (30% of the samples). The mean concentration of lead (Pb) is 0.91 ppm, which is close to its allowable limit. In some samples, elements arsenic (As), cadmium (Cd), nickel (Ni), and zinc (Zn) are different from normal concentrations. The study results attribute the origin of lead elements to the use of chemical zinc fertilizer in rice fields and paddy fields, as Pb concentration in areas with zinc (Zn) fertilizer consumption is about 3.99 ppm. The as concentration in Isa Khandagh is 1.15 ppm, suggesting a high deviation from the normal level. In addition, the concentration of trace elements in rice crops in different regions of Sari city compared with rice crops in some foreign cities shows a high correlation for chromium (Cr), cobalt (Co), Arsenic (As), magnesium (Mg), manganese (Mn), sodium (Na), and Zinc (Zn).
Mehdi Khorasanipour; Afsaneh Barvar
Abstract
Accumulation of potentially toxic elements in agriculture soil is one of the main serious environmental concerns in the greenhouse cultivation. The environmental investigation of potentially toxic elements (V, Ag, Se, Ni, Pb, As, Cr, Co, Cd, Cu, Fe, Mo, Mn, Sn, Sb, Bi and Zn) in the greenhouse cultivated ...
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Accumulation of potentially toxic elements in agriculture soil is one of the main serious environmental concerns in the greenhouse cultivation. The environmental investigation of potentially toxic elements (V, Ag, Se, Ni, Pb, As, Cr, Co, Cd, Cu, Fe, Mo, Mn, Sn, Sb, Bi and Zn) in the greenhouse cultivated soils of the Bagher-Abad area, Jiroft is the main objective of this study. After preliminary field investigations, 20 soil samples were collected by mean of composite method. Collected samples were analyzed using inductively coupled plasma mass spectrometry (ICP-MS) method at the Labwest laboratory, Perth, Australia. The results were discussed using statistical methods and environmental indices with respect to the natural background and worldwide concentrations of target elements. The data showed that only Zn, Cd, Mo, As and in some cases Sb have medium enrichment in the investigated soils. For some of the selected soils the bioavailability or solubility of target elements was determined using 0.005M DTPA leaching solution. Among the investigated elements Cd and Zn showed the maximum bioavailable fraction corresponding to the medium to high risk assessment codes. Antimony is the only trace element that showed poor enrichment (39.3 µg/L) in the irrigation water used for the target greenhouse soils.
H. Ghasemi; Mojtaba. Garavand; N. Hafezi Moghddas
Abstract
In this paper, the role of Gorgan metamorphic complex, as a geogenic source of the heavy metals has been investigated in the soils of south Kordkoy and Gorgan areas. For this, some important soil chemical parameters such as pH, EC, CEC, and concentrations of the heavy metals in 14 soil samples and 6 ...
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In this paper, the role of Gorgan metamorphic complex, as a geogenic source of the heavy metals has been investigated in the soils of south Kordkoy and Gorgan areas. For this, some important soil chemical parameters such as pH, EC, CEC, and concentrations of the heavy metals in 14 soil samples and 6 rock samples have been determined and interpreted. The enrichment factor, geo-accumulation index, contamination factor and degree of soil contamination for the elements of As, Cd, Co, Cr, Cu, Mn, Mo, Pb, V and Fe, have been studied. Multivariant Statistical methods including Pearson correlation, cluster analysis and principal component analysis were done to study the correlations and paragenetic relations. The results shown that the average concentration of Fe (80502.86 ppm) is higher than maximum allowable concentration (70000 ppm) and located near the threshold (100000 ppm). Also, average values of V (165.09ppm) is higher than maximum allowable concentration (150 ppm) but is very lower than its threshold (450 ppm). Average values of Cr, Ni, Co and Cu are in the range of the background concentration and those for Pb, As, Mo and Cd are lower than background. Calculation of the enrichment factor indicates the low enrichment of As and Fe in these soils. Iron, with the geo-accumulation index of 0.14, is uncontaminant to slightly contaminant. Also, contamination factors of iron, cobalt and vanadium are low and overaly, in the sense of environmental quality, the soil of this area classified among uncontaminated or very low contaminated areas. The results of the statistical analysis of the heavy metal data indicate the lowest concentrations of these elements in the soils derived from pelitic schists, especially in Tuskestan valley, and the highest values of them in the soils derived from the basic igneous rocks, such as Naharkhoran valley. These results show a natural geogenic origin for the heavy metals and the role of chemical composition of the Gorgan metamorphic complex in the entrance of them in the soils of this area.
