Submitted on: 23 August 2000.
Revised on: 31 October 2000.
Accepted on: 11 November 2000.
___________________Environmental Chemistry Letters
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Submitted on: 15 March 1999.
Revised on: 18 June 1999.
Accepted on: 08 August 1999.
___________________Environmental Chemistry Letters
Submitted on: 06 April 2011.
Revised on: 12 May 2011.
Accepted on: 08 June 2011.
___________________Environmental Chemistry Letters
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