Submitted on: 31 July 2007.
Revised on: 27 September 2007.
Accepted on: 21 October 2007.
___________________Bulletin of the University of Karaganda-Chemistry
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Submitted on: 24 February 1999.
Revised on: 12 May 1999.
Accepted on: 01 June 1999.
___________________Bulletin of the University of Karaganda-Chemistry
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Submitted on: 25 July 2008.
Revised on: 09 November 2008.
Accepted on: 22 December 2008.
___________________Bulletin of the University of Karaganda-Chemistry