This study aims to identify common contaminants in well water linked to an increase in colorectal cancer(CRC)incidence rates in North Dakota(ND)counties.County-specific incidence rates for CRC were obtained from the N...This study aims to identify common contaminants in well water linked to an increase in colorectal cancer(CRC)incidence rates in North Dakota(ND)counties.County-specific incidence rates for CRC were obtained from the ND Statewide Cancer Registry.Corresponding demographic,agricultural,and geophysical data were obtained from population-based sources.Associations between well water contaminants and CRC incidence were examined for 16 counties in ND with complete well water profiles between 1997-2019.Data were analyzed by multiple linear regression.Iron in well water exhibited a significant positive association with CRC incidence(4.75,P=0.001),and barium exhibited a small,but significant negative association(-0.06907,P=0.01).Residents in counties in ND with prevalent well water usage contaminated with iron may be at higher risk for CRC.展开更多
The effects of cast iron pipe corrosion onwater quality risk and microbial ecology in drinking water distribution systems(DWDSs)were investigated.It was found that trihalomethane(THMs)concentration and antibiotic resi...The effects of cast iron pipe corrosion onwater quality risk and microbial ecology in drinking water distribution systems(DWDSs)were investigated.It was found that trihalomethane(THMs)concentration and antibiotic resistance genes(ARGs)increased sharply in the old DWDSs.Under the same residual chlorine concentration conditions,the adenosine triphos-phate concentration in the effluent of old DWDSs(Eff-old)was significantly higher than that in the effluent of newDWDSs.Moreover,stronger bioflocculation ability andweaker hy-drophobicity coexisted in the extracellular polymeric substances of Eff-old,meanwhile,iron particles could be well inserted into the structure of the biofilms to enhance the mechanical strength and stability of the biofilms,hence enhancing the formation of THMs.Old DWDSs significantly influenced the microbial community of bulk water and triggered stronger mi-crobial antioxidant systems response,resulting in higher ARGs abundance.Corroded cast iron pipes induced a unique interaction system of biofilms,chlorine,and corrosion prod-ucts.Therefore,as the age of cast iron pipes increases,the fluctuation of water quality and microbial ecology should be paid more attention to maintain the safety of tap water.展开更多
Passive sampling is a simple and efficacious sampling technique that guarantees a safe collection and transportation of samples to the analysis site, and obtaining results with more temporal resolution. As a case of s...Passive sampling is a simple and efficacious sampling technique that guarantees a safe collection and transportation of samples to the analysis site, and obtaining results with more temporal resolution. As a case of study, passive samplers were deployed in the Ayapel Swamp, Colombia, located in the influence zone of open pit gold mines. Mercury, iron and manganese were sampled at two different depths by the Chemcatcher? passive sampler and regular grab sampling. Additionally, dissolved oxygen, oxidation-reduction potential, pH and water temperature were measured. The results showed that depth and time did not have a significant influence (ANOVA, confidence level of 95%) on mercury concentration on both passive samplers and grab sampling. However, concentration of Fe and Hg in passive samplers had a high positive correlation, but it may be because depth increase during sampling period caused the dilution of both analytes. In conclusion, passive samplers proved to be a valuable tool for understanding the response of mercury to the Ayapel Swamp dynamics.展开更多
安全输配是饮用水水质保障的关键。在对中国南方 S 市配水管网水质大量调查的基础上，分析了余氯、浊度、铁、三卤甲烷、卤乙酸、AOC 等主要水质指标在管网中的变化规律，发现余氯沿管线逐渐降低，浊度和铁基本沿管线逐渐增加，其主要...安全输配是饮用水水质保障的关键。在对中国南方 S 市配水管网水质大量调查的基础上，分析了余氯、浊度、铁、三卤甲烷、卤乙酸、AOC 等主要水质指标在管网中的变化规律，发现余氯沿管线逐渐降低，浊度和铁基本沿管线逐渐增加，其主要影响因素有管道属性、温度及水力条件等；三卤甲烷在管网中表现出增加的趋势，而卤乙酸则在管网中表现出降低的趋势，其主要影响因素有余氯浓度、水质条件、温度条件及水力条件等；供水系统中 AOC 以 AOC-P17为主要组分，沿供水系统有逐渐增加的趋势，其浓度、组成以及在管网中的变化规律呈现明显的季节性。展开更多
基金Supported by The National Institute of General Medical Sciences(NIGMS),No.1P20GM155890-01 to GGS.
文摘This study aims to identify common contaminants in well water linked to an increase in colorectal cancer(CRC)incidence rates in North Dakota(ND)counties.County-specific incidence rates for CRC were obtained from the ND Statewide Cancer Registry.Corresponding demographic,agricultural,and geophysical data were obtained from population-based sources.Associations between well water contaminants and CRC incidence were examined for 16 counties in ND with complete well water profiles between 1997-2019.Data were analyzed by multiple linear regression.Iron in well water exhibited a significant positive association with CRC incidence(4.75,P=0.001),and barium exhibited a small,but significant negative association(-0.06907,P=0.01).Residents in counties in ND with prevalent well water usage contaminated with iron may be at higher risk for CRC.
基金supported by the National Natural Science Foundation of China(Nos.52000043,and 51838005)the intro-duced innovative R&D team project under the“The Pearl River Talent Recruitment Program”of Guangdong Province(No.2019ZT08L387)+2 种基金the Guangdong Natural Science Foundation(No.2023A1515011509)the Science and Technology Research Project of Guangzhou(Nos.202201020177,202102020986 and 202102021044)the special fund from Key Laboratory of Drinking Water Science and Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences(No.20K01KLDWST).
文摘The effects of cast iron pipe corrosion onwater quality risk and microbial ecology in drinking water distribution systems(DWDSs)were investigated.It was found that trihalomethane(THMs)concentration and antibiotic resistance genes(ARGs)increased sharply in the old DWDSs.Under the same residual chlorine concentration conditions,the adenosine triphos-phate concentration in the effluent of old DWDSs(Eff-old)was significantly higher than that in the effluent of newDWDSs.Moreover,stronger bioflocculation ability andweaker hy-drophobicity coexisted in the extracellular polymeric substances of Eff-old,meanwhile,iron particles could be well inserted into the structure of the biofilms to enhance the mechanical strength and stability of the biofilms,hence enhancing the formation of THMs.Old DWDSs significantly influenced the microbial community of bulk water and triggered stronger mi-crobial antioxidant systems response,resulting in higher ARGs abundance.Corroded cast iron pipes induced a unique interaction system of biofilms,chlorine,and corrosion prod-ucts.Therefore,as the age of cast iron pipes increases,the fluctuation of water quality and microbial ecology should be paid more attention to maintain the safety of tap water.
文摘Passive sampling is a simple and efficacious sampling technique that guarantees a safe collection and transportation of samples to the analysis site, and obtaining results with more temporal resolution. As a case of study, passive samplers were deployed in the Ayapel Swamp, Colombia, located in the influence zone of open pit gold mines. Mercury, iron and manganese were sampled at two different depths by the Chemcatcher? passive sampler and regular grab sampling. Additionally, dissolved oxygen, oxidation-reduction potential, pH and water temperature were measured. The results showed that depth and time did not have a significant influence (ANOVA, confidence level of 95%) on mercury concentration on both passive samplers and grab sampling. However, concentration of Fe and Hg in passive samplers had a high positive correlation, but it may be because depth increase during sampling period caused the dilution of both analytes. In conclusion, passive samplers proved to be a valuable tool for understanding the response of mercury to the Ayapel Swamp dynamics.
