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Li Y.,Sun Yat Sen University | Li Y.,Guangdong Provincial Key Laboratory of Geological Process and Mineral Resource Survey | Zhou Y.-Z.,Sun Yat Sen University | Zhou Y.-Z.,Guangdong Provincial Key Laboratory of Geological Process and Mineral Resource Survey | And 10 more authors.
Geological Bulletin of China | Year: 2010

In Shunde District of Foshan City, Pearl River Delta Economic Zone, 208 topsoil samples and 114 vegetable samples were collected from vegetable fields to measure the contents of lead (Pb), which species of 38 topsoil samples were extracted. The results showed that the average concentration of heavy metal Pb was 44.3 mg/kg. The contents of soil lead that exceeded Guangdong Province soil background values accounted for 77.5%, the content of lead in vegetable that exceeded safety requirements for non-environmental pollution vegetable accounted for 74.6%. The accumulation tendency of soil Pb of study area in the future 10 years was predicted based on the accumulation rate of soil Pb in 2007 which equaled to 1.02 mg/kg. Early-warning for the accumulation tendency of soil Pb were done based on the threshold values 150, 270, 300 and 8580 mg/kg, respectively. The scale which soil Pb in excess of 150 mg/kg was increased during 2007-2017 years, however, the scales were increased, which soil Pb in excess of 270, 300 mg/kg, respectively. There was a significant relation between the transfer factor values and the corresponding soil Pb concentrations (full dosage or bioavailable amount), which can be described by a plateau model. The target hazard quotients (THQs) can be used to evaluate the health risks with heavy metals by consuming vegetable. The THQs of Pb in vegetables were below 0.4 that values from large to small were THQhigh>THQurban >THQmedian>THQrural>THQlow, which indicated that the health risk via vegetable consumption in the high levels of family economic income was the highest. Moreover, further researches about influence of Pb on the human health through other exposure paths should be done. Source


Li Y.,Sun Yat Sen University | Li Y.,Guangdong Provincial Key Laboratory of Geological Process and Mineral Resource Survey | Zhou Y.-Z.,Sun Yat Sen University | Zhou Y.-Z.,Guangdong Provincial Key Laboratory of Geological Process and Mineral Resource Survey | And 9 more authors.
Huanjing Kexue/Environmental Science | Year: 2010

The index of local Moran's I is a useful tool for identifying hotspots of soil Ni and Cr, and for classifying them into spatial clusters and spatial outliers. To identify hotspots of vegetable soils Ni and Cr in high-incidence area of liver cancer, Shunde area of Foshan City, Pearl River Delta Economic Zone, 208 topsoil samples were collected from vegetable fields to measure the contents of nickel (Ni) and chromium (Cr). The results showed that the mean concentrations of two heavy metals Ni, Cr were 33.21 mg/kg, 80.84 mg/kg, respectively, Which were 130%, 60% higher than their soil background values of Guangdong Province, respectively. Generally, Ni is partly accumulated in soil but the accumulation of Cr is not obvious at all. The local Moran's I of Ni and Cr was calculated using 3000, 6000, 9000 m as distance bands, respectively. The hotspots of Ni and Cr elements in soils were identified by local Moran's I which computed based on 6000 m; "individual hotspots" are in the north which were affected by anthropogenic factors; "regional hotspots" are in the south which were controlled by parent materials. Moreover, the distributions of "regional hotspots" of Ni, Cr are the same as that of the highest mortality rate of liver cancer, this consistence could come up with a research direction that could reveal environmental etiologic factors of liver cancer. Source


Qiu Z.,Sun Yat Sen University | Qiu Z.,Guangdong Provincial Key Laboratory of Geological Process and Mineral Resource Survey | Wang Q.,Sun Yat Sen University | Wang Q.,Guangdong Provincial Key Laboratory of Geological Process and Mineral Resource Survey | And 9 more authors.
Geotectonica et Metallogenia | Year: 2014

Mineral inclusions are important probes to explore the crystallizing process, geochemical environment, and forming mechanism for their host minerals. In-situ microscopic laser Raman spectroscopy, electron microprobe and LA-ICP-MS analysis were carried out on mineral inclusions in 24 gem-grade alluvial diamonds from the Yuanjiang Basin in Hunan province. The results showed that the portions of eclogite- and peridotite-type mineral inclusion assemblages are similar and can be coexist in diamond grains. The calculated temperatures, based on nitrogen aggregation states and their portions, range from 1109 to 1237℃, and the forming pressures calculated using Raman barometry range from 4.05 to 5.83 GPa for olivine inclusions in the Hunan diamonds, corresponding to a depth of 133~192 km. Furthermore, the mineral inclusions and assemblages reveal that the Hunan diamonds were formed in a lithospheric mantle environment in the Yangtze Craton, which is distinct from the diamonds from the North China Craton. The Hunan diamonds may be formed in a lithospheric mantle containing abundant eclogite, showing the participation of ancient crustal material in the formation of the diamonds. Source

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