Sorption, degradation and mobility of microcystins in Chinese agriculture soils: Risk assessment for groundwater protection.
In the present paper, sorption, persistence, and leaching behavior of three microcystin variants in Chinese agriculture soils were examined. Based on this study, the values of capacity factor and slope for three MCs variants in three soils ranged from 0.69 to 6.00, and 1.01 to 1.54, respectively. The adsorption of MCs in the soils decreased in the following order: RR > Dha7 LR > LR. Furthermore, for each MC variant in the three soils, the adsorption rate in the soils decreased in the following order: soil A > soil C > soil B. The calculated half-time ranged between 7.9 and 17.8 days for MC-RR, 6.0-17.1 days for MC-LR, and 7.1-10.2 days for MC-Dha7 LR. Results from leaching experiments demonstrated that recoveries of toxins in leachates ranged from 0-16.7% for RR, 73.2-88.9% for LR, and 8.9-73.1% for Dha7 LR. The GUS value ranged from 1.48 to 2.06 for RR, 1.82-2.88 for LR, and 1.76-2.09 for Dha7 LR. Results demonstrated the use of cyanobacterial collections as plant fertilizer is likely to be unsafe in soils.
Chen
Wei
W
State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Chinese Academy of Sciences, Donghu Nanlu No 7, Wuhan 430072, China.
Song
Lirong
L
Gan
Nanqin
N
Li
Lin
L
D000327:Adsorption; D000383:Agriculture; D001427:Bacterial Toxins; D001673:Biodegradation, Environmental; D002681:China; D000458:Cyanobacteria; D005068:Eutrophication; D052998:Microcystins / Q000633:toxicity; D018570:Risk Assessment / Q000379:methods; D012989:Soil Pollutants; D014876:Water Pollution; D014881:Water Supply
D001427:Bacterial Toxins; D052998:Microcystins; D012989:Soil Pollutants; C078588:microcystin