A study of thermodynamic properties of halogenated methane by the method of chemical bond parameter function
用键参数函数法研究卤代甲烷的热力学性质
Molecular structural parameters including inductive effect index(∑I),equilibrium electronegativity of atom(XE),total electron of atom nuclear external(∑e),total bond length of substituents to center atom(∑d) and electronegativity margin for all substituents(ΔX) were used model the 13C chemical shift of 45 halogenated methane.
利用描述电子效应的诱导效应指数(∑I)、原子的平衡电负性(XE)和反映核外电子云变形程度的总电子数(∑e)、各取代基到中心原子的化学键键长总和(∑d)以及各取代基电负性的和差值(ΔX)等参数对45个卤代甲烷化合物中的碳原子结构进行表征,并与其13CNMR谱化学位移建立了优良的定量结构-波谱关系模型:δC=-7403。
A correlation was investigated between the boiling points and molecular structure of halogenated methanes, and a new method was developed to calculate and predict the boiling points of halogenated methanes.
探讨了卤代甲烷的沸点与其分子结构之间的关系 ,发展了一种既能计算卤代甲烷沸点、又能预测未知卤代甲烷沸点的方法 。
Trihalomethanes in drinking water reduction through air stripping
空气吹脱法去除饮用水中的三卤甲烷
The laboratory-scale and pilot-scale experiments were conducted to investigate the efficiency of controlling trihalomethanes(THMs) yields by combined preoxidation,which was carried out by potassium permanganate composite(PPC) and chlorine using a typical contaminated resource water in northern China.
通过小试和中试实验研究了高锰酸盐复合药剂(PPC)与氯联合预氧化工艺对三卤甲烷(THM s)的控制效果。
Variations of assimilable organic carbon(AOC),trihalomethanes(THMs) and haloacetic acids(HAAs) in two different water distribution systems(DSs) were investigated in Shanghai,a eastern city of China.
研究了上海市2条不同水源水厂配水管网中可同化有机碳(AOC)、三卤甲烷(THMs)和卤乙酸(HAAs)的变化情况,并对饮用水生物稳定性和消毒副产物间的相关性进行了分析。
Research on THMs formation kinetics in water network;
给水管网中三卤甲烷数学模型研究
Determination and Evaluation of THMs in Water Supply in Kelamayi City
克拉玛依市自来水中三卤甲烷的测定与评价
Some organic matter that have aromatic structure similar as humic acid are selected to conduct chlorination test,determined the formation of HAAs & THMs of tested matters,researched the relationship of the chemical structure of DBPFP with DBPs formation characteristics.
选择与腐殖酸有相似芳香结构的有机物进行氯化试验,测定其卤乙酸及三卤甲烷生成量,研究前体物化学结构与氯化消毒副产物生成特性的关系。
Effect of Electronegativity and Polarizability on the C 1s Core Ionization Energies of Halomethanes;
原子电负性和极化度对卤代甲烷C 1s电子电离能的影响
The electrostatic effect constants for the substituents in an aromatic system were used firstly to study the bond dissociation enthalpy (BDE) of a halomethane system Y-CHnX3-n (n=0,1,2 and 3; Y=H,F,Cl,Br and I; X=F,Cl,Br and I).
将芳环上取代基的电子效应参数引入卤代甲烷,以卤代甲烷分子Y-CHnX3-n(n=0～3;Y=H,F,Cl,Br,I;X=F,Cl,Br,I)中Y—C键的标准键焓EYs-C与中心C原子相键连原子的场/诱导效应之和ΣFi、共轭效应之和ΣRi以及诱导偶极之和Σ(α×F)为参数,建立了一个定量估算卤代甲烷分子中Y—C键离解能(BDE)的通用模型,BDE(Y—C)=57。
It is observed that the removal efficiencies and the sonolysis rate constants of three halomethanes after 1h ultrasonic irradiation fitted the following increasing order:CHCl3< CHBrCl2<CCl4,and the degradation of halomethanes studied followed the pseudo-first-order kinetics model,respectively.
以饮用水中痕量氯仿、四氯化碳和一溴二氯甲烷3种卤代甲烷为目标化合物,采用超声辐照技术研究它们在不同条件下的去除效果。
Combined pretreatment of potassium permanganate and chloramines to control trihalomethane formation;
高锰酸钾与氯胺联用预处理控制三卤甲烷生成
7% of total organic carbon and produce more trihalomethane than other fractions in the raw water.
考察了原水中各有机组分的分布及其在加氯消毒过程中的三卤甲烷生成量、生成速度及耗氯量情况 。
The decrease of total haloacetic acid and trihalomethane is about 69.
1%,三卤甲烷的总量降低了89%,减少了一种消毒副产物———二溴一氯甲烷。
Cloning and Functional Analysis of Methyl Halide Transferase;
卤代甲烷—甲基转移酶基因的克隆和功能研究
Quantitative Relation between Boiling Points of Haloenated Methanes and Molecular Structure;
卤代甲烷的沸点与分子结构之间的定量关系
A study of thermodynamic properties of halogenated methane by the method of chemical bond parameter function
用键参数函数法研究卤代甲烷的热力学性质
This paper summarized the researches on source and sink of methyl halides under global change and explored the further study orientation.
文章概述了全球变化下卤代甲烷源汇的研究情况并简单探索其进一步的研究方向。
Halon1301 system
卤代烷1301系统
Halon replacement
卤代烷灭火剂替代品
halon gas extinguishing system
卤代烷气体灭火系统
Halon1301 battery
卤代烷1301灭火剂钢瓶组
Trihalomethanes in drinking water reduction through air stripping
空气吹脱法去除饮用水中的三卤甲烷
Research Progress of Trihalomethanes Determination in Water Samples
水样中三卤甲烷的测定方法研究进展
Cancer Risks Assessment for Trihalmethanes in Reclaimed Water in Beijing
再生水中三卤甲烷的致癌危险度评价
Amines can engage in nucleophile substitution reaction with alky.
胺能参加与卤代烷的亲核取代反应。
Marine halon fire extinguishing system technical specifications
GB/T14088-1993船用卤代烷灭火系统技术条件
Code for design of halon 1301 fire extinguishing systems
卤代烷1301灭火系统设计规范
Code for design of haton 1211 fire extinguishing systems
卤代烷1211灭火系统设计规范
Halon1301 design concentrations for flame extinguishment
卤代烷1301灭火剂设计灭火浓度
Halon1301 design concentrations for inerting
卤代烷1301灭火剂设计惰化浓度
Study on the Vapor-Liquid Equilibra of the Multicomponent Systems Containing Halogenated Silane;
多元卤代硅烷体系的汽液相平衡研究