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Zhang P.,Guangdong Provincial Academy of Environmental Science | Zhang C.,Guangxi University | Pan L.,Agricultural Resources and Environment Research Institute Guangxi Academy of Agricultural science | Yang W.,Guangxi University | And 4 more authors.
Soil and Sediment Contamination | Year: 2016

Lime, sepiolite and peat were used as amendments to study their effects on the chemical speciation of Cd and Pb in a polluted paddy soil under moist and water-logged conditions. The results showed that application of amendments reduced acid-extractable Cd (up to 12.56% and 5.07%) and Pb (up to 6.69% and 2.68%) in moist and water-logged soils, respectively. The reducible Cd and residual Cd was increased while the oxidizable Cd was decreased after adding amendments. However, the oxidizable Pb was increased while the residual Pb was decreased in amended soil, and the reducible Pb presented a different changing trend under moist and water-logged conditions. The soil pH was significantly correlated with different fractions of Cd and Pb in soil, which indicated a distinct influence of soil pH on the redistribution process of Cd and Pb fractions in amended soil. © 2016 Taylor & Francis Group, LLC


Su R.,Environmental Monitoring Station of Guangxi | Wang X.-F.,Environmental Monitoring Station of Guangxi | Wang X.-F.,Guangxi University | Hong X.,Environmental Monitoring Station of Guangxi | And 2 more authors.
Xiandai Huagong/Modern Chemical Industry | Year: 2015

A method to determine concentrations of 10 elements in soil by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) with microwave digestion is developed. The effect of disturbance of isotope on soil determination is studied. The detection limits for the method are 0.01-0.46 μg/L. The relative standard deviation (RSD) is less than 4.8%. The recoveries are 92.3%-108.3%. The accuracy and precision of the method are validated by reference materials and the results are consistent with the certified values. This method with good reproducibility and wide linearity is simple and rapid, which is suitable for the analysis of large batches of soil samples. ©, 2014, China National Chemical Information Center. All right reserved.


Deng C.,Guangxi University | Zhang C.,Guangxi University | Li L.,Environmental Monitoring Station of Guangxi | Li Z.,Guangxi University | Li N.,Environmental Monitoring Station of Guangxi
Applied Geochemistry | Year: 2011

Mercury contamination of the environment is of worldwide concern because of its global presence and its potent neurotoxicity. Mining, smelting and the electronics industry are the main sources of Hg pollution. However, few studies have been performed to investigate systemic Hg contamination in metal mining regions. In this study, concentrations of Hg in air, farmland soil, and crops were measured in a Pb-Zn mining area in the karst region of Guangxi, China. Key factors that could affect Hg distribution, such as the fate of waste ore and waste residue, were analyzed. Geo-statistical methods were adopted to analyze the characteristics of spatial structure and distribution of Hg. The results show that Hg contamination in this region is serious. The total mercury (T-Hg) content is far higher than the Level II Limit Value of Chinese Soil Standards of 0.30mgkg-1, showing obvious directional characteristics from WNW to ESE. Highest Hg concentrations were found in the WNW portion of the study area. The contamination of paddy soil is higher than that in dry farmland soil. The vertical distribution of T-Hg and its decrease with depth suggest that the important sources are waste water irrigation and the improper disposal of the waste ore and waste rock. The T-Hg concentrations in the agricultural products examined exceed the Chinese tolerance value (0.02mgkg-1 for rice and 0.01mgkg-1 for vegetables), indicating the seriousness of the problem. The ecological environment and the safety of food grown in this mining area are being affected, with the result that human health is possibly being affected. © 2010 Elsevier Ltd.


Deng C.B.,Environmental Monitoring Station of Guangxi | Liu Y.Q.,Guangxi University | Xian P.,Guangxi University | He J.H.,Guangxi University | And 4 more authors.
Advanced Materials Research | Year: 2013

With the design of the aquiculture system, the purification effect was studied to provide the basis for the ecological aquiculture model. The research results show that the organic pollutants and ammonia nitrogen concentrations were reduced to below 5 mg/L and 0.5 mg/L in the system; When the concentration of CODMn keeps above 8 mg/L, the ammonia nitrogen can be removed efficiently; The system is capable for resistance shocking, when the concentration of CODMn increased to more than 65 mg/L or ammonia nitrogen concentration increased to more than 6 mg/L, the system can keep a high purification effect. © (2013) Trans Tech Publications, Switzerland.


Fu J.,Guangxi University | Wang X.F.,Environmental Monitoring Station of Guangxi | Wang X.F.,Guangxi University | Deng C.B.,Guangxi University | Xian P.,Guangxi University
Applied Mechanics and Materials | Year: 2014

In order to provide an effective and economic method for the yeast wastewater′s treatment, this study taken yeast wastewater as objection, and applied immobilized micro-aerobic microorganism technology into yeast wastewater′s treatment, then explored the degradation effect of major pollutants in yeast wastewater. The immobilized carrier was analyzed by scanning electron microscope (SEM) and Fourier transform infrared spectrometer (FTIR), and dominant species in immobilized carrier were identified. The results showed that immobilized carrier was a composite carrier with porous structure, and removal rate of chemical oxygen demand (COD), ammonia nitrogen (NH3-N), total nitrogen (TN) and total organic carbon (TOC) of yeast wastewater by using the immobilized micro-aerobic microorganism technology were 71.1%, 99.7%, 61.4% and 67.0%, respectively. Moreover, the dominant bacteria which attached in the carrier included Sphingomonas paucimobilis, Pseudomonas putida, Acinetobacter lwoffii and Pseudomonas stutzeri. © (2014) Trans Tech Publications, Switzerland. All Rights Reserved.

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