[Objective] The research aimed to study the determination of 16 kinds of OCPs in water by liquid-liquid extraction -GC. [Method] The new method for determining 16 kinds of OCPs in water by liquid-liquid extraction -GC...[Objective] The research aimed to study the determination of 16 kinds of OCPs in water by liquid-liquid extraction -GC. [Method] The new method for determining 16 kinds of OCPs in water by liquid-liquid extraction -GC was established, and the influencing factors such as nitrogen pressure and water bath temperature were discussed. [ Result] Detection limit of the method was from 3.2 to 14.1 ng/L, the relative standard deviation was between 4.0% and 9.6%, and the average recovery ranged from 80.8% to 106.0%. By optimizing nitrogen pressure and water bath temperature in the sample pretreatment process, when nitrogen pressure was ＋0.087 kPa, and water bath temperature was ±36 ℃, recovery effect of this method was better. [ Conclusion] The determination method had accurate qualitative and quantitative results, and met detection requirement of 16 kinds of OCPs in water.展开更多
The current study aimed to employ integrated risk assessment models to estimate carcinogenic and non-carcinogenic human health risks of organochlorine pesticides(OCPs)from Pakistan.GIS-based geo-statistical technique ...The current study aimed to employ integrated risk assessment models to estimate carcinogenic and non-carcinogenic human health risks of organochlorine pesticides(OCPs)from Pakistan.GIS-based geo-statistical technique was used to classify OCPs'polluted risk zones using risk indexes.The residual level of POCPs detected in wheat and rice ranged from 1.78 to 12.46 ng g^(-1) and 4.92e18.19 ng g^(-1),respec-tively with the prevalence of DDD,DDE and HCH.The distribution pattern revealed a significantly higher concentration towards downstream region,suggesting industrial and agricultural activities as a pollution source in the area.Single pollution index(SPI)was employed for the identification of pollution zones.The findings of SPI for detected OCPs were found(0.7<Pi<1),respectively,depicting minimal pollution at the studied sites.Furthermore,risk assessment results reflected non-cancer risk(>1)for studiedΣOCPs.However,the suggested USEPA value for tolerable carcinogenic risk is<10×^(-6)(one in a million)which was found higher for DDD,DDE,HCH,CT,and HC in the current study.Consequently,the carci-nogenic risk in the study area indicated the need for an assessment,monitoring,and reporting program grounded on laws that can reduce pollution and exposure levels to pesticides in Pakistan for good health and well-being.展开更多
文摘[Objective] The research aimed to study the determination of 16 kinds of OCPs in water by liquid-liquid extraction -GC. [Method] The new method for determining 16 kinds of OCPs in water by liquid-liquid extraction -GC was established, and the influencing factors such as nitrogen pressure and water bath temperature were discussed. [ Result] Detection limit of the method was from 3.2 to 14.1 ng/L, the relative standard deviation was between 4.0% and 9.6%, and the average recovery ranged from 80.8% to 106.0%. By optimizing nitrogen pressure and water bath temperature in the sample pretreatment process, when nitrogen pressure was ＋0.087 kPa, and water bath temperature was ±36 ℃, recovery effect of this method was better. [ Conclusion] The determination method had accurate qualitative and quantitative results, and met detection requirement of 16 kinds of OCPs in water.
文摘The current study aimed to employ integrated risk assessment models to estimate carcinogenic and non-carcinogenic human health risks of organochlorine pesticides(OCPs)from Pakistan.GIS-based geo-statistical technique was used to classify OCPs'polluted risk zones using risk indexes.The residual level of POCPs detected in wheat and rice ranged from 1.78 to 12.46 ng g^(-1) and 4.92e18.19 ng g^(-1),respec-tively with the prevalence of DDD,DDE and HCH.The distribution pattern revealed a significantly higher concentration towards downstream region,suggesting industrial and agricultural activities as a pollution source in the area.Single pollution index(SPI)was employed for the identification of pollution zones.The findings of SPI for detected OCPs were found(0.7<Pi<1),respectively,depicting minimal pollution at the studied sites.Furthermore,risk assessment results reflected non-cancer risk(>1)for studiedΣOCPs.However,the suggested USEPA value for tolerable carcinogenic risk is<10×^(-6)(one in a million)which was found higher for DDD,DDE,HCH,CT,and HC in the current study.Consequently,the carci-nogenic risk in the study area indicated the need for an assessment,monitoring,and reporting program grounded on laws that can reduce pollution and exposure levels to pesticides in Pakistan for good health and well-being.
