检索结果-南通市图书馆

Formation and cytotoxicity of a new disinfection by-product (DBP) phenazine by chloramination of water containing diphenylamine

引用

Journal of Environmental Sciences 2012年第7期24卷 1217-1224页

作者： Wenjun Zhou Linjie Lou Lifang Zhu Zhimin Li Lizhong Zhu Department of Environmental Science Zhejiang UniversityHangzhou 310058China Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control Hangzhou 310058China Zhejiang Water Conservancy and Hydropower College Hangzhou 310018China

disinfection by-products （DBPs） in drinking water have caused worldwide concern due to their potential carcinogenic effects. The formation of phenazine from diphenylamine （DPhA） chloramination was studied and its cytotoxicities for two human cancer cells were also investigated. Phenazine was detected synchronously with the consumption of DPhA by chloramination, which further confirmed that the new DBP phenazine can be produced along with N-nitrosodiphenylamine （NDPhA） from DPhA chloramination. The formation of phenazine had a maximum molar yield with solution pH increasing from 5.0 to 9.0, with phenazine as the main product for DPhA chloramination at lower pH, but higher pH favored the formation of NDPhA. Thus, solution pH is the key factor in controlling the formation of phenazine and NDPhA. Both the initial DPhA and chloramine concentrations did not show a significant effect on the molar yields of phenazine, although increasing the chloramine concentration could speed up the reaction rate of DPhA with chloramines. The cytotoxicity assays showed that phenazine had significant cell-specific toxicity towards T24 （bladder cancer cell lines） and HepG2 （hepatic tumor cell lines） cells with IC50 values of 0.50 and 2.04 mmol/L, respectively, and T24 cells being more sensitive to phenazine than HepG2 cells. The ICs0 values of phenazine, DPhA, and NDPhA for T24 cells were of the same order of magnitude and the cytotoxicity of phenazine for T24 cells was slightly lower than that of NDPhA （IC50, 0.16 mmol/L）, suggesting that phenazine in drinking water may have an adverse effect on human health.

关键词： phenazine diphenylamine disinfection by-product chloramination cytotoxicity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of Br−on NDMA Formation During Chloramination:a Review of Influencing Factors,Mechanisms,and Control

引用

Chemical Research in Chinese Universities 2023年第3期39卷 370-377页

作者： XIA Ruanjunjie LIAO Xiaobin LIU Tianze GAO Menglan CHEN Chao Institute of Municipal and Environmental Engineering College of Civil EngineeringHuaqiao UniversityXiamen361021P.R.China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084P.R.China

For the invasion of seawater and the stress of human activities,bromide ion(Br−)exists widely in drinking water sources,and it was found to influence the formation of non-brominated but carcinogenic nitrogen-containing disinfection by-product nitroso-dimethylamine(NDMA)during chloramination(NH2Cl).The presence of Br−leads to the formation of bromine-active species,such as bromamines(NH2Br),bromochloramine(NHClBr),as well as hypobromous acid(HOBr),which are more reactive with NDMA precursors than chlorine-active species,so might promote NDMA generation.This review mainly focuses on the influencing laws,as well as the factors(disinfection conditions and characteristics of water matrixes)that affected NMDA formation during chloramination with Br−.In addition,the possible influencing pathways are discussed.Finally,based on the above summary,measures pertaining to reduce the impact of Br−on NDMA production are concluded.This review would provide a theoretical reference for drinking water treatment plants to deal with bromine-containing water during chloramination.

关键词： Bromide ion disinfection by-product Nitrosodimethylamine(NDMA) Chloramination

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Formation of THMs, Microcystin-LR and Odors from Microcystis Aeruginosa-Derived Organic Matter

Formation of THMs, Microcystin-LR and Odors from Microcystis...

引用

2014 International Conference on Green Materials and Environmental Engineering (GMEE2014)

作者： Huan Wang Dong-mei Liu Peng Wang Fu-yi Cui State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology

Algogenic organic matter（AOM）, including extracellular organic matters（EOM） and intracellular organic matters（IOM） can interfere with drinking water treatment processes and cause water quality problems, among which the formation of disinfection byproducts（DBPs）, microcystins and odor and taste compounds are of particular concern. In this study, the formations of THMs, Microcystins-LR and 2-MIB during four growth phase（lag phase, exponential phase, stationary phase and death phase） were investigated. The THMs formation potential of EOM and IOM were compared. Higher CHCl3 concentration was found in IOM than that in EOM. In the presence of bromide, more brominated-THMs generated, and the TTHMs increased more rapidly in EOM than IOM. The 2-MIB was found a similar trend with the MC-LR in the four growth phase. The total 2-MIB was gradually increased as a function of the time. The formation of MC-LR and 2-MIB depended on algae density.

关键词： Intracellular organic matter Extracellular organic matter disinfection by-product Microcystin-LR 2-MIB

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Environmental Dilemma of Humic Substances:Being Adsorbents and Being Carcinogens

Environmental Dilemma of Humic Substances:Being Adsorbents a...

引用

作者： E.Yel G.Ahmetli Selcuk University Engineering FacultyEnvironmental Eng.Department Selcuk University Engineering FacultyChemical Eng.Department

Humic materials can be classified as soluble in high p H, soluble in all p H’s, and insoluble in all p H’s(IHA). In this study, humic substances in the environment were discussed, and their different environmental contributions, either positive or negative, were investigated. Some humic substances help the water treatment while some others cause carcinogenic matter accumulation in water. This dilemma was discussed with different examples. In the first part of this study, IHA was used as adsorbent in removal of some metals, chemical oxygen demand(COD) and color from water. The results were presented together with literature results. IHA could adsorb various heavy metals in 10 to 300 mg/g capacity interval, while COD removal performance was 2270 mg/g. In the second part of the study, soluble humic matter in natural waters and disinfection by-products(DBP) formation upon chlorination of such waters were discussed. Humic fractions were important precusors of DBP’s such as trihalomethanes(THMs) and haloacetic acids(HAAs). Depending on the water resource, the humic substances, THM and HAA formation potentials and types and quantities of the compounds may differ, but all are bioaccumulative and potentially carcinogenic. The study investigated the two different faces of humic substances in the environment.

关键词： Adsorption disinfection by-product humic acid treatment

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：