排序方式: 共有4条查询结果,搜索用时 0 毫秒
1
1.
Shashi B. Singh Gita Kulshrestha 《Journal of environmental science and health. Part. B》2013,48(1):27-31
A novel and cost-effective method of sulfosulfuron extraction has been developed using distilled water as an extraction solvent. Using this method, the environmental fate of sulfosulfuron was investigated in soil under wheat crop. Studies were conducted under natural field conditions in randomized block design and herbicide (75% water dispersible granules (WG)) was applied after 24 days of sowing. The rates of applications were 25 and 50 g of active ingredient (a.i.) per hectare. Soil samples were collected at predetermined intervals and analyzed by high performance liquid chromatography (HPLC). The minimum detection limit was found to be 0.001 μ g g? 1. The dissipation of sulfosulfuron followed first-order rate kinetics and dissipated with a half-life of 5.4–6.3 days. After harvest, field soil was used for conducting a pot experiment with bottle gourd (Lagenaria siceraria) as test plants to study the carry over effect of sulfosulfuron. No phytotoxicity was observed to bottle gourd in pot experiment with harvest soil. 相似文献
2.
Adsorption and degradation of sulfosulfuron in soils 总被引:3,自引:0,他引:3
Adsorption of sulfosulfuron was studied in two soils (topsoil from Alfisol and Inceptisol). The adsorption of sulfosulfuron
was greater in topsoil collected from Alfisol than in Inceptisol. The soil sorption coefficient K and the soil organic carbon sorption coefficient K
oc are the basic parameters used for describing the environmental fate of the herbicides. In topsoil the calculated K values
from Alfisol was 4.43 and in topsoil from Inceptisol was 2.00. K
c values were 6.06 in topsoil from Alfisol and 3.33 in topsoil from Inceptisol. The K
oc values were 886.36 in topsoil from Alfisol and 770.26 in topsoil from Inceptisol. Field experimental plots with no previous
history of sulfosulfuron were selected and studied the degradation of sulfosulfuron in the topsoil collected from Alfisol
and Inceptisol. The half-life of sulfosulfuron in topsoil from Alfisol: T
1− 3.97 days and T
2− 4.54 days; topsoil from Inceptisol: T
1 − 4.68 days and T
2 − 5.52 days. The degradation of sulfosulfuron followed first-order kinetics. The persistence of sulfosulfuron was found relatively
longer in the Inceptisol than in Alfisol. The combination of degradation data (t
1/2 – soil) and organic carbon based sorption (K
oc) data of herbicides have been used to assess the pesticide environmental impact in soils through Gustafson Ubiquity Score
(GUS). The GUS values were found to be 0.69 in topsoil from Alfisol and 0.83 in Inceptisol. 相似文献
3.
I. SANTÍN-MONTANYÁ J. L. ALONSO-PRADOS M. VILLARROYA J. M. GARCÍA-BAUDÍN 《Journal of environmental science and health. Part. B》2013,48(6):781-793
This study presents a bioassay procedure, based on the root and shoot growth parameters, for the determination of the herbicide sulfosulfuron (1-(4,6 dimethoxypyrimidin-2-yl)-3-(2-ethylsulfonylimidazo[1,2-a]pyridin-3-ylsulfonil)urea) sensitivity on seven vegetal species. Plant response to sulfosulfuron was calculated with the equations fitted to the root growth data as a function of the logarithm of the herbicide concentration by non-linear regression and was used to calculate the doses for 10, 30 and 50% inhibition of root growth (EC10, EC30 and EC50). The results indicate that the phytotoxic effect of sulfosulfuron in all the species assayed followed the order: flax > maize > onion > vetch > lepidium sativum > tomato > barley. These species showed phytotoxicity at low levels of sulfosulfuron and flax appeared to be the most susceptible species to sulfosulfuron (0.001 mg/L). 相似文献
4.
Atmakuru R Perumal Elumalai T Sivanandam S 《Environmental monitoring and assessment》2007,130(1-3):519-528
Long term stability of sulfosulfuron was investigated in subsoil under the natural wheat cropping conditions. Experiments
were conducted by applying a commercial formulation of sulfosulfuron on soil at 50 g/ha and 100 g/ha. To understand the factors
influencing the persistence of residues two different experiments were conducted. In one experiment wheat crop was cultivated
once at the beginning of the two years study period and subsequently the plots were kept undisturbed for the remaining period.
In another experiment cultivation of subsequent crops were continued during the study period. In both the cases sulfosulfuron
was applied only once at the beginning of the study. Representative soil samples were collected from the depths viz., 0–5,
15, 30, 45, 60 and 90 cm on different pre determined sampling occasions 50, 100, 200, 300, 400, 500 and 600 days after the
application of the herbicide. The collected soil samples were analyzed for the residues of sulfosulfuron. Under the influence
of continuous cropping conditions residues of sulfosulfuron were found to be relatively low when compared with the soil samples
collected from the agriculture plots maintained without any cultivation. The residues detected are in the range 0.001 to 0.017 μg/g.
Samples collected from the depth, at 30 to 45 cm showed higher residual concentrations. Soil samples were also showed the
presence of break down products. The data has been confirmed by LC–MS/MS. The relation between residue content of sulfosulfuron
and the factors contributing the stability of herbicide concentration were also studied. 相似文献
1