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Mo H.,Sichuan Agricultural University | Li L.,Sichuan Agricultural University | Lai W.,Sichuan Agricultural University | Zhao M.,Meishan Environmental Monitoring Center | And 3 more authors.
Particuology | Year: 2015

Aerosol samples were collected over 24 and 12 h to represent day/night aerosol characteristics in forest areas at Ya'an Baima Spring Scenic Area (BM), Panzhihua Cycas National Nature Reserve (PZ), Gongga Mountain National Nature Reserve (GG), and Wolong National Nature Reserve (WL), during the summers of 2010-2012. Mass and chemical component concentrations, including organic carbon, elemental carbon, and inorganic ions (F-, Cl-, NO2-, NO3-, SO42-, C2O42-, PO43-, K+, Na+, Ca2+, Mg2+, and NH4+), of PM2.5 aerosols were measured. The average PM2.5 concentrations for 24 h were 72.42, 104.89, 20.55, and 29.19 μg/m3 at BM, PZ, GG, and WL, respectively. Organic matter accounted for 38.0-49.3%, while elemental carbon accounted for 2.0-5.7% of PM2.5 mass. The sum concentrations of SO42-, NH4+, and NO3- accounted for 23.0%, 17.4%, 22.1%, and 30.5% of PM2.5 mass at BM, PZ, GG, and WL, respectively. Soil dust was also an important source of PM2.5, accounting for 6.3%, 17.0%, 10.4%, and 19.1% of PM2.5 mass at BM, PZ, GG, and WL, respectively. These reconstructed masses accounted for 75.9-102.0% of PM2.5 mass from the four forest areas of SW China. © 2014 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy ofSciences. Published by Elsevier B.V. All rights reserved.

Li Q.,Sichuan Agricultural University | Li Q.,Meishan Environmental Monitoring Center | Wang Y.-J.,Sichuan Agricultural University | Zong G.-Y.,Meishan Environmental Monitoring Center | And 3 more authors.
Chinese Rare Earths | Year: 2013

Using hydroponic culture, the effects of single cerium, single cadmium, as well as their combined pollution on the seed germination rate, activity of alpha amylase, three types of antioxidant enzymes (SOD, POD, CAT) activities, the content of malondialdehyde and plasma membrane permeability of corn seed were investigated. The results show that the optimum dose of cerium can alleviate the toxicity of 30 mg · L-1 of cadmium to maize seed, improve seed germination rate, enhance the activities of alpha amylase and antioxidant enzymes (SOD, POD, CAT) and reduce MDA content and plasma membrane permeability. When cadmium dose is 100 mg · L-1, cerium does not have obvious detoxification effect, but aggravates cadmium toxicity.

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