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Submitted on: 08 August 1999.
Revised on: 17 October 1999.
Accepted on: 09 November 1999.
___________________Environmental Science-Water Research & Technology
Submitted on: 29 October 2008.
Revised on: 29 December 2008.
Accepted on: 14 February 2009.
___________________Environmental Science-Water Research & Technology
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Submitted on: 22 March 2003.
Revised on: 07 July 2003.
Accepted on: 16 August 2003.
___________________Environmental Science-Water Research & Technology
Submitted on: 16 September 2013.
Revised on: 05 November 2013.
Accepted on: 06 December 2013.
___________________Environmental Science-Water Research & Technology