The three week wet run ( top ) and flood run ( bottom ) were selected for analysis because the highest average concentration of dissolved Pb was observed for the 3wwet run at the top of the mesocosm ( 21.5 ± 2.9 mg L −1 ) , ( 10 ± 2.1 mg L −1 ) and the lowest average concentration was observed for the constant flood run at the bottom ( 10.8 ± 2 mg L −1 ) , ( 3.8 ± 0.3 mg L −1 ) ( Tables 2 and 3 ) . Mineral phases and SI 's were calculated from input data ( Table A1 ) and are listed ( Table 4 ) .