Study of the decay kinetics and mechanism of atrazine and its derivatives in water

Pao Yue-kong Library Electronic Theses Database

Study of the decay kinetics and mechanism of atrazine and its derivatives in water

 

Author: Lin, Koon-yee
Title: Study of the decay kinetics and mechanism of atrazine and its derivatives in water
Degree: M.Sc.
Year: 2009
Subject: Hong Kong Polytechnic University -- Dissertations.
Atrazine -- Biodegradation.
Atrazine -- Environmental aspects.
Department: Dept. of Civil and Structural Engineering
Pages: 69 leaves : ill. (some col.) ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2329749
URI: http://theses.lib.polyu.edu.hk/handle/200/4560
Abstract: The degradation of Atraine (ATZ) in a close-to-natural environment was investigated with concentration and pH as controlled variables and then cross-checked with temperature and sunlight information. Decay rate constant of ATZ in nature was slowest in neutral pH and fastest at extreme pH levels. Experiments run at same climatic condition show that higher ATZ concentration leads to slower decay rate constant. Two ATZ degradation mechanisms: direct photolysis and hydrolysis were identified and studied in the laboratory as a comparison. Hydrolysis was found to be a slow process but it is present throughout the whole reaction time. The lab test shows a similar decay trend as the outdoor data. Effect of temperature on hydrolysis was also studied. Relationship among temperature, acidic pH and decay rate constant for ATZ with initial concentration 13.9uM was established. Photolysis, on the other hand, was a fast reaction and therefore dominates the performance and increases the decay rate constant of ATZ at outdoor. Humic acid at low concentration can act as photosensitizer and enhance photolysis of ATZ while at high concentration scavenge radicals and retard the decay rate constant. Optimum dosage was determined to be l0ppm.

Files in this item

Files Size Format
b23297499.pdf 3.236Mb PDF
Copyright Undertaking
As a bona fide Library user, I declare that:
  1. I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
  2. I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
  3. I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.

     

Quick Search

Browse

More Information