Back to Search
Start Over
A laboratory study on risk assessment of microcystin-RR in cropland
- Source :
-
Journal of Environmental Management . Feb2008, Vol. 86 Issue 3, p566-574. 9p. - Publication Year :
- 2008
-
Abstract
- Abstract: The persistence time and risk of microcystin-RR (MC-RR) in cropland via irrigation were investigated under laboratory conditions. In order to evaluate the efficiency of the potential adsorption and biodegradation of MC-RR in cropland and the persistence time of MC-RR for crop irrigation, high performance liquid chromatography (HPLC) was used to quantify the amount of MC-RR in solutions. Our study indicated that MC-RR could be adsorbed and biodegraded in cropland soils. MC-RR at 6.5mg/L could be completely degraded within 6 days with a lag phase of 1–2 days. In the presence of humic acid, the same amount of MC-RR could be degraded within 4 days without a lag phase. Accordingly, the persistence time of MC-RR in cropland soils should be about 6 days. This result also suggested the beneficial effects of the organic fertilizer utilization for the biodegradation of MC-RR in cropland soils. Our studies also demonstrated that MC-RR at low concentration (<10μg/L) could accelerate the growth of plants, while high concentration of MC-RR (>100μg/L) significantly inhibited the growth of plants. High sensitivity of the sprouting stage plants to MC-RR treatments as well as the strong inhibitory effects resulting from prolonged irrigation further indicated that this MC-RR growth-inhibition may vary with the duration of irrigation and life stage of the plants. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 03014797
- Volume :
- 86
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Journal of Environmental Management
- Publication Type :
- Academic Journal
- Accession number :
- 27516645
- Full Text :
- https://doi.org/10.1016/j.jenvman.2006.12.040