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Several methods may be applied to decontaminate recently or historically polluted soils. In order to determine which method is the best to decontaminate one certain historically polluted soil, an assessment of that soil should be done. This work present the assessment of a historically hydrocarbon polluted soil from chemical and biological point of view. Chemical analysis revealed high concentrations...
The purpose of this study is to evaluate the adsorption potentialities of humate substances in natural environments. Humic acid and insolubilized humic acid are selected as prototypes. This paper presents the development of a new remediation technology for contaminated sandy soil using humic acid (HA). The results indicated a significant increase of the adsorption of Cr (VI) because the complexion...
With red mud - the waste of alumina refinery was developed to preparate red mud-based particle as remediation material, it was applied to contaminated soil from lead-zinc district and planting leeks was for pot experiments. Sampling at 1,5,10,20,30 days under amount of 0-15% and extracting sequentially, the different phases of lead and zinc were determined. And content of lead and zinc in the leek...
Rhodotorula sp., one of the common yeast, was able to degradate the Nonylphenol in liquid culture. The effect on degradation of Nonylphenol in soil, and the effect of the co-treating with the aboriginal microorganis was studied under different conditions. The result showed that the proceddion of Nonylphenol degradation in soil fitted the first order reaction kinetices model (the correlation index...
This study dealed with the distribution and the origin of trace elements (Co, Cd, Mn, Ni, Zn, Tl and Pb) in two soil profiles from a site near a plant roasting pyrite for sulfuric acid production. Chemical partitioning of the trace elements showed that Tl and Pb in each individual extractable fraction(i.e. weak acid exchangeable, reducible and oxidizable)presented increasing trend upward through the...
With the development of the arsenic industry, major environmental pollution accidents caused by arsenic chemicals has been occurring. It is necessary to find a quick and effective method to remedy arsenic contaminated soils, because the soil generally is the most direct casualty after arsenic pollution event occurs. This article discusses the extraction effects of arsenic contaminated soils using...
Sand culture was used to investigated the Cd and Pb phyto extraction by sunflower, and changes of organic acids including oxalic acids, citric acids and tartaric acids. The results showed that bioconcentration factors (BCF) of Cd or Pb increased with time and decreased with concentrations, the highest Cd-BCF and Pb-BCF appeared in Cd5 (21) and Pb50(7.95), respectively. The contents of oxalic acids...
Surveys has been developed for the quality of the soil environment in the vegetable plot, choosing some vegetable bases in Chengdu's suburb- Pengzhou as the study area. In order to analyze the changing trend of soil environmental quality in the suburban vegetable base, comparisons from the soil pH, soil nutrient composition, soil heavy metals to pesticide residues have been made with the previous...
This study was aimed to assess the levels of selected heavy metals and herbicides in soils under different land usage and plant products from an agricultural area of Tieling district, Liaoning Province, China. Cd, Pb, atrazine, acetochlor and butachlor were analyzed from maize, paddy and vegetable field. Cd concentrations in 40% of vegetable soils and 6.67% of rice soils were higher than "Environmental...
Soil samples in different depths we recollected from Tiebutie pool in Daqing, which was used to take up waste water from a petrochemical plant for about 30 years. The distribution and concentration of polycyclic aromatic hydrocarbons(PAHs) in organo-mineral aggregates were analyzed. Results show that the concentration of low molecular PAHs is the highest in all fractions, and the concentration of...
Effects of granulated red mud addition on the fractionation of Pb and Zn in soil and plants growth were studied by 2 batches of soil column incubation experiment(with and without leeks). Experimental results showed that all treatments with granulated red mud addition significantly decreased the concentrations of bio-available and Zn. Compared with the control, the treatment with5% granulated red mud...
Sand culture was used to investigated the Cd and Pb phytoextraction by sunflower, and changes of organic acids including oxalic acids, citric acids and tartaric acids. The results showed that bioconcentration factors (BCF) of Cd or Pb increased with time and decreased with concentrations, the highest Cd-BCF and Pb-BCF appeared in Cd5 (21) and Pb50 (7.95), respectively. The contents of oxalic acids...
The urban environment quality is of vital importance as the majority of people now live in cities. Due to the continuous urbanization and industrialization in many parts of the world, metals are continuously emitted into the urban environment and pose a great threat on human health. In this study, a total of 38 soil samples were collected from Weinan industrial urban areas, NW, China, and the concentrations...
Soil contamination is an enormous problem in China and severely threatens environmental quality and food safety. Desorption of contaminants from soil is a critical process controlling the availability of soil contaminants and thus the risk associated with contaminated soil. All the currently adopted desorption models greatly simplify desorption by assuming that desorption is a simple reverse of adsorption...
Estimating chlorophyll content of plant exactly is meaningful in precision agriculture because of its ability in indicating photosynthesis activity, stress and nutritional state of plant. Heavy mental contamination in agricultural field has been one of vital ecological environment issues which threaten global environment quality, human being subsistence and food security as well. The soil contamination...
The current study investigated oral bioaccessibility of soil Cu, Zn, Cd and Pb in an agricultural community known for contamination of Cd due to mining activities nearby, using an in vitro test that simulates human gastric condition. Relatively high metal concentrations compared to Thai `background' concentrations were observed and the %bioaccessibilites were found to be 28±13% for Cu, 42±18% for...
Because all aspects of reasons, some areas in China are subject to different levels of soil pollution, ecological environment, food security and agricultural sustainable development constitutes a threat, soil pollution, the situation is grim. Cleanup (or remediation) technologies available for reducing the harmful effects at heavy metal-contaminated sites include Solidification/Stabilization Technologies,...
Interactions between lead (Pb) and benzo(a)pyrene (Bap)toward soil dehydrogenase activity (dha) in rhizosphere soils of ryegrass and non-rhizosphere soils were studied after 2, 4, and 8 weeks of exposure under controlled conditions. The experimental approach was based on a uniform design. Six different contamination conditions were studied simultaneously, with 6 concentration levels for each pollutant...
To investigate the characteristics of migration and distribution of phenanthrine plays an important role in the control of polynuclear aromatic hydrocarbons (PAHs) contamination. This experiment simulate the migration and distribution of phenanthrine in soil-groundwater by using indoor dynamic soil column test and hydrogeological theories so as to understand the condition and rules of phenanthrine...
Soil heavy metal pollution has increasing applied pressure on land resources with the intensive effects of local geochemistry or human activities in recent years. This investigation was conducted to understand the spatial variability of the soil heavy metal elements, to evaluate the relationship between heavy metals and their probable sources and to identify or forewarn the probable heavy metal contamination...
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