Anhui Institute of Environmental Science

Hefei, China

Anhui Institute of Environmental Science

Hefei, China
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Li R.-Z.,Hefei University of Technology | Geng R.-N.,Hefei University of Technology | Huang Q.-F.,Hefei University of Technology | Qian J.,Anhui Institute of Environmental Science | And 2 more authors.
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2017

From November 2015 to April 2016, nine field tracer experiments including four human disturbance scenarios were conducted in an agricultural headwater stream of Nanfei River, located in Chaohu Lake basin. To explore the nutrient retention efficiencies and its response to human disturbance for multi-pool morphological pattern in streams, conservative (NaCl) and non-conservative (NH4Cl and KH2PO4) solutes were co-injected at a constant rate. Based on the tracer experiments, hydraulic parameters and nutrient spiraling metrics were calculated. Test stream reach displayed striking turbulence characteristics through the nine tracer experiments and its flow belonged to subcritical flow. The decrease of Sw-NH4 (NH4 + uptake lengths) in the deep pool under human disturbances was significant with a drop from 331∼3304m to 232∼609m, while the PO4 3- uptake lengths Sw-NH4 increased slightly with a raise from 232∼609m to 301∼1100m.The Sw-NH4 decreased sharply from 4812∼58895m to 2463∼13955m, and the Sw-NH4 also dropped markedly from 6242∼75285m to 1792∼11432m, in the straight sub-reach in the case of human disturbances. The falling ranges of Sw-NH4 and Sw-NH4 in the straight sub-reach greatly exceeded that in the pool sub-reach under human disturbances, suggesting that the straight sub-reach was highly affected by the human disturbance. Compared with the natural situation, the values of Vf-NH4 and Vf-PO4 both in straight and pool sub-reaches under human disturbances had an increase, which would be helpful to nutrient retention. From the point of the whole test stream, the effectiveness of human disturbance was feasible and effective for the improvement of nutrient retention efficiency. © 2017, Editorial Board of China Environmental Science. All right reserved.


Chen F.,Chinese Research Academy of Environmental Sciences | Chen F.,Hefei University of Technology | Wu W.,Hefei University of Technology | Lu S.,Chinese Research Academy of Environmental Sciences | And 4 more authors.
Chinese Journal of Environmental Engineering | Year: 2015

To assess the effect of repaired engineering on soil and sediment in the Gonghu Bay Returning Fishery to Lake Area (GBRFLA),track survey on the Engineering of Gonghu Bay Returning Fishery to Lake was made from November 2012 to May 2014. Soil physical and chemical properties of GBRFLA were analyzed and compared. The results showed that the chemical properties of the GBRFLA's soil and sediment, i.e. organic matter(OM), TN and TP increased 241.59%, 98.61%, 162.86% than early period of GBRFLA respectively. Among them, the average contents of available nitrogen and phosphorus were 102.31 mg/kg and 15.10 mg/kg. They all meet III standard of the classification standard of soil nutrient grade. Compared with the early period of GBRFLA, the main physical properties were repaired significantly. Soil density decreased by 17.84%, pH was stable in 5.8~6.5, the buffer capacity of soil increased obviously. The soil aggregate stability from best to worst are as following, the southern area (artificial planted area)> the western area (natural recovered area)> the northern area (no artificial planted area with the poorest basal condition). After 17 months, the overall quality of basement tended to be well. Each index gradually tended to be stabilized. The soil environment already has good ecological functions. ©, 2015, Science Press. All right reserved.


Li R.,Hefei University of Technology | Pan C.,Anhui Institute of Environmental Science | Chen J.,Hefei University of Technology | Jiang Y.,Hefei University of Technology | Ding G.,Hefei University of Technology
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2013

Based on the characteristics of concomitancy of multiple uncertainties in environmental health risk system, the blind number theory was introduced to the assessment of human health risk. Blind number models were developed to calculate exposure dose and characterize the health risk of heavy metals, and a classification model for cancer risk was put forward as well. As a case study, the models established were applied for health risk assessment of Pb, Zn, Cr, As, Cu, Ni and Cd in urban topsoil and dust of Tongling City. And possible values and their corresponding credible degrees of cancer and non-cancer risks were calculated simultaneously for the measured heavy metals. The results showed that the total expected value of non-cancer risk for the seven metals reached 2.036, far exceeding the safety threshold value 1.0. Especially for As, the non-cancer risk through ingestion of dust particles approached 1.438. In general, the expected value of non-carcinogenic risk for the measured seven metals decreases in the order of As>Cr>Pb>Cu>Cd>Ni>Zn. Regarding carcinogen effects, the highest risk for As is associated with ingestion of dust particles and its overall expected value reached 5.195×10-4, far exceeding the upper limit (1.0×10-4) recommended by the United States Environmental Protection Agency (USEPA). In addition, the carcinogen risk for As through dermal contact with dust particles was also high, expected as 3.964×10-5 close to the highest acceptable risk value 5.0×10-5 proposed by the International Radiation Protection Association (ICRP).


Xu D.,Anhui University | Xu D.,Suzhou University | Zhan J.,Anhui University | Chen Z.,Anhui University | And 4 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2012

Vetiveria zizanioides L. is a Gramineae herbaceous perennial with rapid growth and is highly adaptable to its environment. It is often found in wasteland and lead/ zinc mining abandoned soil. V. zizanioides is also strongly adaptable to copper mine tailings. The criteria for determining successful phytoremediation focus on both aboveground vegetation and substrate characterization. To understand the effects of artificial revegetation on the remediation of wastelands associated with the Tongling copper mine tailings in Anhui Province, we studied the dynamic changes in chemical properties, microbial biomass, enzyme activity in the tailings, and the relationships between these factors. The tailings were collected under V. zizanioides communities constructed on copper mine tailing wastelands at different times: JX (V. zizanioides communities were established in the recent stage); ZX (V. zizanioides communities were established in the middle stage); and OX (V. zizanioides communities were established in the early stage). The results showed that the tailings under the ZX and OX communities, had higher pH values and lower electrical conductivity and available Cu and Pb concentrations than the tailings under the JX community, indicating that the process of tailings acidification slowed down after the establishment of the V. zizanioides community. As the V. zizanioides community developed over time, the total N and available P in the tailings at 0-5 cm and 5-20 cm depths increased; with the total N and available P in the tailings at 0-5 cm under the OX 4. 64 and 22. 44 times higher, respectively than at the same depth under the JX. The total N accumulation at 0-5 cm was significantly higher than at the 5-20 cm depth, indicating the effect of the phytoremediation on improving the substrate chemical properties. With increased plantation time, the dehydrogenase, catalase and urease enzyme activities and the microbial biomass C and N contents also gradually increased at the 0-5 cm and 5-20 cm depths, but the alkaline phosphatase activity did not increase. The dehydrogenase and catalase activities and the microbial biomass C and N contents were all either extremely significantly or significantly negatively correlated with the electric conductivity. However, the microbial biomass N contents and all soil enzyme activities were significantly positively correlated to the total N content, indicating that total N was a dominant influence on soil enzyme activities. The microbial biomass and most soil enzyme activities decreased with increasing Cu and Pb contents, and the dehydrogenase and catalase activities were most sensitive to Cu, but less sensitive to Zn. The V. zizanioides has shown a significant ability to improve the chemical properties of tailings, and also to increase microbial biomass and soil enzyme activities. It is an adaptive plant species, and is recommended for the ecological rehabilitation of copper mine tailing wastelands.


Xu D.,Anhui University | Xu D.,Suzhou University | Zhou P.,Anhui University | Zhan J.,Anhui University | And 3 more authors.
Ecotoxicology and Environmental Safety | Year: 2013

Environmental pollution due to mining activities has been reported in many countries. In this study, 283 vegetable and 44 corresponding garden soil samples were collected in the vicinity of the Tongling mining area, China. The aim was to evaluate the bioavailability of trace metals (Cu, Zn, Pb and Cd) to vegetables by comparing different methods (trace metals in DTPA, EDTA, HCl, NH4NO3, NH4OAC aqueous solutions and total metals in garden soils), and assess the potential health risks of trace metals to the local population via vegetable consumption. The results showed that the mean values of total Cu and Cd in the soil samples exceeded the Grade II national standard in China. Average concentrations of Cd and Pb in some vegetable samples were higher than the maximum permissible concentration in China. The transfer factors for trace metals in different vegetables showed a trend of Cd>Zn>Cu> Pb. Asteraceae vegetables had stronger metal uptake than Liliaceae. The total target hazard quotient (THQ) value was greater than 1, suggesting that trace metals in vegetables could present some potential health risks. The effectiveness of the studied methods for estimating soil metal bioavailability was generally dependent on the particular metal and vegetable species. Overall, 1.0M NH4OAC provided the best estimate of Cd and Zn bioavailability in multi-elemental contaminated soils. None of the studied soil metal extraction methods appeared suitable for measuring Cu or Pb bioavailability, especially for Pb, which showed almost no correlation between metal concentration in soil and vegetables. © 2012 Elsevier Inc.


Li R.-Z.,Hefei University of Technology | Pan C.-R.,Anhui Institute of Environmental Science | Xu J.-J.,Hefei University of Technology | Chen J.,Hefei University of Technology | Jiang Y.-M.,Hefei University of Technology
Huanjing Kexue/Environmental Science | Year: 2013

A systematic survey of As, Ni, Cu, Pb, Cd and Zn concentrations in eight kinds of vegetables (involving 226 samples) and their corresponding soils at 35 sampling sites in the fragmentary vegetable plots of a typical nonferrous metals mine city, Tongling, was carried out for assessing heavy metal pollution, bio-accumulation ability and potential health risk to local inhabitants due to exposure via consumption of vegetables. The results showed that: (1) The soils of the studied vegetable plots were seriously contaminated by heavy metals and the mean concentrations of As, Ni, Cu, Pb, Cd and Zn reached 96.96, 56.64, 1247.82, 313.59, 6.743 and 600.96 mg·kg-1, respectively, all significantly exceeding the soil background value of Tongling city; (2) The mean values of integrated pollution index corresponding to eight varieties of vegetables were all higher than the threshold value (i. e. 3.0) of heavy pollution; (3) In general, the largest bioaccumulation factor of heavy metals in vegetables was As, followed by Ni and Cu, and the order of pollution degree of heavy metals in vegetables was Ni>Zn>Cu>Pb>As>Cd; (4) The target hazard quotients (THQs) of As, Ni, Cu, Pb, Cd and Zn were 17.92, 1.01, 10.14, 0.73, 0.21 and 1.93, respectively. Arsenic and copper were the major risk contributors for inhabitants since the THQs of them respectively mounted to 56.10% and 31.75% of the total THQ value according to the average vegetable consumption; (5) The estimated daily intake (DI) of As, Ni, Cu, Pb, Cd and Zn from vegetables was 324.38, 1211.25, 24326.25, 176.25, 12.75 and 34800 μg·d-1 for adult residents, respectively; and (6)The target cancer risk (TR) of vegetables polluted by As to individual human health was 8.06×10-3, significantly higher than the management standard (i. e. 10-6-10-4) of United States Environmental Protection Agency (US EPA) and the standard (i. e. 5.0×10-5) of International Commission on Radiological Protection (ICRP), indicating that it was quite unsafe for the general population to consume vegetables from the studied fragmentary plots.


Li R.-Z.,Hefei University of Technology | Jiang Y.-M.,Hefei University of Technology | Pan C.-R.,Anhui Institute of Environmental Science | Chen J.,Hefei University of Technology | Xu J.-J.,Hefei University of Technology
Huanjing Kexue/Environmental Science | Year: 2013

A modified Tessier's sequential extraction procedure was used to investigate the fraction of seven types of heavy metals (Cd, Cr, Cu, Zn, Ni, Pb, As) in the surface sediments from Huixi Stream in Tongling City, a typical nonferrous metals mining city, China. Based on speciation distribution analysis of these metals, contamination degree and ecological risk assessment of heavy metals were conducted by means of risk assessment code (RAC) and mean sediment quality guideline quotient (SQG-Q). The results show that: (1) Cr and As are major composed with residual fractions, Zn, Ni and Pb are mainly constituted of residual and bound to iron and manganese oxides fractions, and Cu is dominated by bounding to organic matter, while Cd exists in approximate mass fractions of exchangeable, bound to carbonates, bound to iron and manganese oxides, and residue. (2) Carbonate and exchangeable mass fractions of Cd, Cr, Cu, Zn, Ni, Pb and As reach 46.48%, 4.62%, 4.05%, 4.12%, 9.17%, 0.97% and 0.03%, respectively. According to the RAC, Cd is of high risk to the environment, Cr, Cu, Zn and Ni are of low risk to the environment, while Pb and As pose extreme low risk to the environment. (3) The SQG index, calculated with SQG-Q, is 10.42, which is far higher than the threshold value 1.0, indicating that the sediment in Huixi Stream has a very high potential for biological toxicity effect. The PEL-Q indexes corresponding to Cd, Cr, Cu, Zn, Ni, Pb and As approach 4.23, 1.14, 20.75, 6.04, 2.33, 4.58 and 41.71, respectively, suggesting that all these metals have great potentials for biological toxicity and the adverse effects will frequently occur.


Li R.-Z.,Hefei University of Technology | Pan C.-R.,Anhui Institute of Environmental Science | Chen J.,Hefei University of Technology | Jiang Y.-M.,Hefei University of Technology | Ding G.-Z.,Hefei University of Technology
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2012

This research focused on the potential health risk assessment of heavy metals (including As) pollution in urban topsoil and dust from Tongling, a typical nonferrous metal mining city, China. Samples were collected from sixty four sampling sites covering six land-use types, that is, industrial, residential, commercial, educational and traffic areas, as well as city squares. The heavy metal (Pb, Cu, Cr, Zn, Ni, As and Cd) contents of all samples were analyzed and health risk assessment were conducted for children and adult respectively, using the risk models recommended by the United States Environmental Protection Agency (US EPA). The levels of heavy metal elements in the urban topsoil and dust of Tongling are much higher than the natural soil background level in the regions, suggesting that the urban topsoil and dust have been heavily polluted by those metals. The exposure to Cr, Ni, As and Cd results in a cancer risk value of 4.30×10-7, 7.18×10-9, 4.26×10-4 and 7.58×10-8, respectively, and the mean cancer risk for such six land-use types vary in the range of 1.55×10-4-9.14×10-4, significantly higher than the acceptable or tolerable range of threshold values 10-6~10-4 recommended by USEPA, and the 5.0×10-5 probability level deemed unacceptable by the International Commission on Radiation Protection (ICRP). The exposure to topsoil and dust yields an aggregate Hazard Index of 5.20 and 16.58 for children, respectively, while the exposure to dust results in an aggregate Hazard Index of 2.80 for adult, far exceeding the threshold value of 1.0. As a predominant single contributor both to carcinogenic and non-carcinogenic risks, arsenic is the trace element of most concern. In addition, the highest risk is associated with ingestion of soil particles.


Li R.-Z.,Hefei University of Technology | Huang Q.-F.,Hefei University of Technology | Qian J.,Anhui Institute of Environmental Science | Yin X.-X.,Hefei University of Technology | Wei L.,Hefei University of Technology
Huanjing Kexue/Environmental Science | Year: 2016

From November 2015 to February 2016, five short-term tracer injections were performed with a conservative tracer (NaCl) in an agricultural headwater stream, Lake Chaohu basin. Thus the data sets of tracer experiments were finally employed for calculating the physical characteristics and transient storage metrics. Through the comparisons between the artificial pool reach and straight reach, characteristics of transient storage for the artificial pool geomorphic structure were interpreted and explored. Study results showed that: (1) The ratio of As/A in artificial pool was larger than that in straight reach, whereas its value of exchange coefficient α was lower by an order of magnitude than that of straight reach. (2) Artificial pool geomorphic structure had greater influence of transient storage on solute retention than that in straight reach, but its solute retention capacity of flowing water was weaker than that of straight reach. (3) It had a large ratio of As/A for the pool geomorphic structure, whereas its impact on the migration and transformation of solutes was less than that of straight reach. (4) Based on the Fmed 200 metric, the transient storage accounted for 18.86% to 26.05% of travel time in artificial pool. For the straight reach, the Fmed 200 metric had a range of 5.28% to 33.87%. In most cases, the values of Fmed 200 metric in straight reach were higher than those in artificial pool. (5) Significant differences existed between artificial pool geomorphic structure and straight reach in the values of φw, φA and Ts, however, the differences were not significant in other indicators. © 2016, Science Press. All right reserved.


Pan C.,Anhui Institute of Environmental Science | Pan C.,Nanjing University | Ding F.,Hefei University of Technology | Zheng Z.,Nanjing University
Proceedings of the 3rd International Conference on Environmental Technology and Knowledge Transfer | Year: 2010

Model simulation is the most effective way to quantitatively estimate the agricultural non-point source pollution load, and it's also the premise of planning, control and management for the agricultural non-point source pollution (ANPSP). This paper reviewed the progress of the domestic and international agricultural non-point source pollution model, described briefly the profiles and the main features of some commonly used agricultural non-point source pollution model and discussed the development trend of agricultural non-point source pollution model, which hopes to have a certain reference value for the model selection, improvement and research work.

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