Environment, Development and Sustainability - Due to rapid socioeconomic development, seeking the coordination of resources exploitation and the ecological environment has become an objective... 相似文献
In this study, farmland and mining ecotypes of Solanum photeinocarpum (a potential cadmium (Cd) hyperaccumulator plant) were reciprocally hybridized each other, and the Cd accumulation characteristics of the F1 hybrids were studied. In pot experiments, higher biomasses and Cd extraction abilities were found for two S. photeinocarpum F1 hybrids than for the parents, but the Cd contents in various organs were lower in the hybrids than the parents. However, the differences between the Cd contents in the two hybrids were not significant. The antioxidant enzyme (superoxide dismutase and peroxidase) activities were higher for the S. photeinocarpum F1 hybrids than the parents. Less DNA methylation was found in the hybrids than the parents because more demethylation occurred in the hybrids than the parents. The biomass, Cd content, and Cd extraction ability effects in field experiments were similar to the effects in the pot experiments. It was concluded that reciprocally hybridizing different S. photeinocarpum ecotypes improved the ability of S. photeinocarpum to be used to phytoremediate contaminated land.
Microcystins, which represents one kind of cancerogenic organic compounds, is abundant in eutrophication water. The effects
of reaction factors on chlorine dioxide (ClO2) for removal of low-concentration Microcystin-LR, Microcystin-RR, and Microcystin-YR in water as well as the reaction mechanisms
was investigated by using enzyme-linked immunosorbent assay (ELISA) kit and gas chromatography-mass spectrometry (GC-MS).
The results showed that MC-LR, MC-RR, and MC-YR could be efficiently decomposed by ClO2. The degradation efficiency was shown positively correlated to the concentration of ClO2 and reaction time; while the effect of reaction temperature and pH is slight. The kinetic constants and activation energies
of the reaction of MC-LR, MC-RR, and MC-YR with ClO2 are determined as 459.89, 583.15, 488.43 L·(mol·min)−1 and 64.78, 53.01, 59.15 kJ·mol−1, respectively. As indicated by high performance liquid chromatography mass spectrometer (HPLC-MS) analysis, degradation should
be accomplished via destruction of Adda group by oxidation, with the formation of dihydroxy substituendums as end products.
This study has provided a fundamental demonstration of ClO2 serving as oxidizing disinfectant to eliminate microcystins from raw water source. 相似文献