US EPA

7450972 

Journal Article 

A laboratory study on risk assessment of microcystin-RR in cropland 

Bibo, L; Yan, G; Bangding, X; Jiantong, L; Yongding, L 

2008 

Yes 

Journal of Environmental Management
ISSN: 0301-4797
EISSN: 1095-8630 

86 

3 

566-574 

English 

17467149 

10.1016/j.jenvman.2006.12.040 

WOS:000252673300012 

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 (<10microg/L) could accelerate the growth of plants, while high concentration of MC-RR (>100microg/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. 

Adsorption; Biodegradation; Crop plants; Cropland soils; Environmental behavior; Microcystin-RR; Persistence time; cyanoginosin RR; humic acid; organic fertilizer; adsorption; biodegradation; crop plant; fertilizer application; irrigation; liquid chromatography; persistence; risk assessment; soil fertility; adsorption; article; biodegradation; cabbage; concentration response; controlled study; cropland; fertilizer application; growth inhibition; high performance liquid chromatography; irrigation (agriculture); laboratory test; nonhuman; plant growth; plant life cycle stage; quantitative analysis; rapeseed; risk assessment; seedling; sensitivity analysis; soil analysis; time; Adsorption; Agriculture; Biodegradation, Environmental; Carcinogens; Chromatography, High Pressure Liquid; Crops, Agricultural; Kinetics; Microcystins; Risk Assessment; Soil Microbiology; Soil Pollutants