Sorption, degradation and mobility of microcystins in Chinese agriculture soils: risk assessment for groundwater protection

• Published in: Environmental pollution (1987) Vol. 144; no. 3; pp. 752 - 758
• Main Authors: Chen, Wei, Song, Lirong, Gan, Nanqin, Li, Lin
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.12.2006; Elsevier
• Subjects: Adsorption; agricultural soils; Agriculture; Agronomy. Soil science and plant productions; Applied sciences; Bacterial Toxins; biodegradation; Biodegradation, Environmental; Biological and medical sciences; Biological and physicochemical properties of pollutants. Interaction in the soil; China; Cyanobacteria; Earth sciences; Earth, ocean, space; Engineering and environment geology. Geothermics; Eutrophication; Exact sciences and technology; fertilizer application; Fundamental and applied biological sciences. Psychology; groundwater contamination; Groundwater protection; half life; leaching; Leaching behavior; Microcystin; microcystins; Microcystins - toxicity; Microcystis; organic fertilizers; Persistence; Plant fertilizer; Pollution; Pollution, environment geology; Risk assessment; Risk Assessment - methods; Soil and sediments pollution; Soil and water pollution; soil organic matter; soil pH; Soil Pollutants; Soil science; soil texture; soil types; Soils; Sorption; Water Pollution; Water Supply; China; Asia; China, People's Rep; Persistence; Sorption; Soils; Leaching behavior; Risk assessment; Microcystin; Groundwater protection; Plant fertilizer; Cyclic peptides; Transport process; Cyanobacteria; Bacteria; Lixiviation; Agriculture; Organic compounds; Ground water; Microcystis aeruginosa; Fertilization; Pollutant behavior; Agricultural soil; Toxin; Adsorption; Polypeptide; Environment impact; Bloom; Water pollution
• ISSN: 0269-7491; 1873-6424
• DOI: 10.1016/j.envpol.2006.02.023

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>Dha 7 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-Dha 7 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 Dha 7 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 Dha 7 LR. Results demonstrated the use of cyanobacterial collections as plant fertilizer is likely to be unsafe in soils. The use of cyanobacterial blooms as plant fertilizer is likely to be unsafe in soils.