tetrahalomethanes

A study of thermodynamic properties of halogenated methane by the method of chemical bond parameter function

用鍵參數函數法研究鹵代甲烷的熱力學性質

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.

利用描述電子效應的誘導效應指數(∑I)、原子的平衡電負性(XE)和反映核外電子云變形程度的總電子數(∑e)、各取代基到中心原子的化學鍵鍵長總和(∑d)以及各取代基電負性的和差值(ΔX)等參數對45個鹵代甲烷化合物中的碳原子結構進行表征,并與其13CNMR譜化學位移建立了優良的定量結構-波譜關系模型: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.

探討了鹵代甲烷的沸點與其分子結構之間的關系 ,發展了一種既能計算鹵代甲烷沸點、又能預測未知鹵代甲烷沸點的方法 。

Trihalomethanes in drinking water reduction through air stripping

空氣吹脫法去除飲用水中的三鹵甲烷

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.

通過小試和中試實驗研究了高錳酸鹽復合藥劑(PPC)與氯聯合預氧化工藝對三鹵甲烷(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條不同水源水廠配水管網中可同化有機碳(AOC)、三鹵甲烷(THMs)和鹵乙酸(HAAs)的變化情況,并對飲用水生物穩定性和消毒副產物間的相關性進行了分析。

Research on THMs formation kinetics in water network;

給水管網中三鹵甲烷數學模型研究

Determination and Evaluation of THMs in Water Supply in Kelamayi City

克拉瑪依市自來水中三鹵甲烷的測定與評價

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.

選擇與腐殖酸有相似芳香結構的有機物進行氯化試驗,測定其鹵乙酸及三鹵甲烷生成量,研究前體物化學結構與氯化消毒副產物生成特性的關系。

Effect of Electronegativity and Polarizability on the C 1s Core Ionization Energies of Halomethanes;

原子電負性和極化度對鹵代甲烷C 1s電子電離能的影響

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).

將芳環上取代基的電子效應參數引入鹵代甲烷,以鹵代甲烷分子Y-CHnX3-n(n=0～3;Y=H,F,Cl,Br,I;X=F,Cl,Br,I)中Y—C鍵的標準鍵焓EYs-C與中心C原子相鍵連原子的場/誘導效應之和ΣFi、共軛效應之和ΣRi以及誘導偶極之和Σ(α×F)為參數,建立了一個定量估算鹵代甲烷分子中Y—C鍵離解能(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.

以飲用水中痕量氯仿、四氯化碳和一溴二氯甲烷3種鹵代甲烷為目標化合物,采用超聲輻照技術研究它們在不同條件下的去除效果。

Combined pretreatment of potassium permanganate and chloramines to control trihalomethane formation;

高錳酸鉀與氯胺聯用預處理控制三鹵甲烷生成

7% of total organic carbon and produce more trihalomethane than other fractions in the raw water.

考察了原水中各有機組分的分布及其在加氯消毒過程中的三鹵甲烷生成量、生成速度及耗氯量情況 。

The decrease of total haloacetic acid and trihalomethane is about 69.

1%,三鹵甲烷的總量降低了89%,減少了一種消毒副產物———二溴一氯甲烷。

Cloning and Functional Analysis of Methyl Halide Transferase;

鹵代甲烷—甲基轉移酶基因的克隆和功能研究

Quantitative Relation between Boiling Points of Haloenated Methanes and Molecular Structure;

鹵代甲烷的沸點與分子結構之間的定量關系

A study of thermodynamic properties of halogenated methane by the method of chemical bond parameter function

用鍵參數函數法研究鹵代甲烷的熱力學性質

This paper summarized the researches on source and sink of methyl halides under global change and explored the further study orientation.

文章概述了全球變化下鹵代甲烷源匯的研究情況并簡單探索其進一步的研究方向。

Halon1301 system

鹵代烷1301系統

Halon replacement

鹵代烷滅火劑替代品

halon gas extinguishing system

鹵代烷氣體滅火系統

Halon1301 battery

鹵代烷1301滅火劑鋼瓶組

Trihalomethanes in drinking water reduction through air stripping

空氣吹脫法去除飲用水中的三鹵甲烷

Research Progress of Trihalomethanes Determination in Water Samples

水樣中三鹵甲烷的測定方法研究進展

Cancer Risks Assessment for Trihalmethanes in Reclaimed Water in Beijing

再生水中三鹵甲烷的致癌危險度評價

Amines can engage in nucleophile substitution reaction with alky.

胺能參加與鹵代烷的親核取代反應。

Marine halon fire extinguishing system technical specifications

GB/T14088-1993船用鹵代烷滅火系統技術條件

Code for design of halon 1301 fire extinguishing systems

鹵代烷1301滅火系統設計規范

Code for design of haton 1211 fire extinguishing systems

鹵代烷1211滅火系統設計規范

Halon1301 design concentrations for flame extinguishment

鹵代烷1301滅火劑設計滅火濃度

Halon1301 design concentrations for inerting

鹵代烷1301滅火劑設計惰化濃度

Study on the Vapor-Liquid Equilibra of the Multicomponent Systems Containing Halogenated Silane;

多元鹵代硅烷體系的汽液相平衡研究