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Pb, Zn, and Cd distribution and migration at a historical zinc smelting site

100%

Lin W. , Xiao T. , Ning Z.

Polish Journal of Environmental Studies

2015

tom 24

nr 2

This study targeted a historical zinc smelting site from southwestern China and investigated the distribution, mobility, and dispersion patterns of trace metals in the surrounding environment. A series of soil, smelting slag, stream sediment, stream water, and groundwater samples were collected from the smelting site and analyzed for Pb, Zn, and Cd. The results showed that the smelting site was seriously polluted with Pb, Zn, and Cd from past smelting fume deposition and smelting slags. Metal fractions and ratios were applied to identify metal dispersion and mobility. During smelting, Cd was preferably volatilized and transported into the surrounding environment, Zn was predominantly recuperated, and Pb was predominantly retained in smelting slags. Metals in contaminated soils were more mobile than those in slags, but slags still posed long-term risk to the surrounding environment with elevated metals. The relative amounts of vertical transport of metals appeared to follow the order of Cd > Zn > Pb, similar to the mobility order by BCR sequential extractions. Sediments and suspended particulate matter (SPM) in the local stream were derived from the contaminated soils and slags. Compared to the local groundwater with little metal pollution, the stream water at the smelting site was heavily polluted with Pb, Zn, and Cd. Elevated metals in the stream water occurred predominantly in SPM due to soil and slag erosion.

Hydrogen sulfide: a versatile regulator of environmental stress in plants

88%

Guo H. , Xiao T. , Zhou H. , Xie Y. , Shen W.

Acta Physiologiae Plantarum

2016

tom 38

nr 01

Primary culture of cat intestinal epithelial cells in vitro and the cDNA library construction

63%

Zhao G. H. , Liu Y. , Cheng Y. T. , Zhao Q. S. , Qiu X. , Xu C. , Xiao T. , Zhu S. , Liu G. Z. , Yin K.

Acta Parasitologica

2018

tom 63

nr 2

Screening of SSR markers associated with scale cover pattern and mapped to a genetic linkage map of common carp (Cyprinus carpio L.)

63%

Xiao T. , Lu C. , Xu Y. , Li C. , Zheng X. , Cao D. , Cheng L. , Mahboob S. , Sun X.

Journal of Applied Genetics

2015

tom 56

nr 2

Preliminary results of spatial distribution of uranium and thorium in soil profi les near a uranium industrial site, Guangdong province, China

63%

Wang J. , Liu J. , Chen Y. , Song G. , Chen D. , Xiao T. , Li H. , Wang C. , Jiang F.

Nukleonika

2016

tom Vol. 61, No. 3

367--371

Four soil profiles were collected from locations with different distances (5, 50, 250 and 1000 m) from a uranium mill tailings dam, Guangdong province, China, to investigate the pollution status of the soil in mining/ milling-related areas based on the contents of uranium (U) and thorium (Th), thus to understand the impacts of uranium industrial activities to the surroundings. The U and Th concentrations were determined by inductively coupled plasma mass spectrometry (ICP-MS) after conventional HF-HNO3-HClO4 digestion procedures. The results indicate that the soils within 50 m from uranium tailing were severely contaminated; those in 250 and 1000 m soil samples were observed to be with local background level even though these in 250 m had slightly higher U/Th ratios. Uranium concentrations varied from 5.50 ± 0.27 to 160.55 ± 8.03 mg/kg, with maximum values recorded in an intermediate layer of the 5-m distance soil profile. In comparison, the concentration of Th ranged from 6.02 ± 0.30 to 84.71 ± 4.24 mg/kg, with maximum values observed in the top layer of the 1000-m distance soil profile. The U/Th ratio varied from 0.15 to 11.99 compared with 0.20, 0.22 and 0.26 of the average for Guangdong province, national China and the world, respectively. The mean U/Th of four soil profiles showed a reduction with distance from the uranium mill tailing dam, suggesting the relatively large magnitude of uranium elevation in soils within limited distances.

High flocculation of coal washing wastewater using a novel bioflocculant from Isaria cicadae GZU6722

63%

Zou X. , Sun J. , Li J. , Ila Y. , Xiao T. , Meng F. , Wang M. , Ning Z.

nr 1