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Influence of Nutrient Levels on Uptake and Effects of Mercury, Cadmium, and Lead in Water Spinach

^a Institute of Applied Environmental Research (ITM), Laboratory for Aquatic Environmental Chemistry, SE-106 91 Stockholm, Sweden
^b Department of Botany, Stockholm University, SE-106 91 Stockholm, Sweden

View larger version (15K): [in a new window]   Fig. 1. Weight increase (g fresh wt.) of untreated water spinach plants after 7 d at different nutrient levels. Values are means ± standard errors.

View larger version (13K): [in a new window]   Fig. 2. Effects of combinations of nutrient strength (1, 25, and 100% Hoagland) and Hg concentrations on water spinach determined as (A) tolerance index (TI) for the weight increase (fresh weight) of the whole plant, (B) dry weight as percent of fresh weight of the whole plant (DW:FW), and (C) root dry weight as percent of whole-plant dry weight (R:WP). Values are means ± standard errors (n = 5), * = significant at the 0.05 probability level.

View larger version (12K): [in a new window]   Fig. 3. Effects of combinations of nutrient strength (25 and 100% Hoagland) and Cd concentrations on water spinach determined as (A) tolerance index (TI) for the weight increase (fresh weight) of the whole plant, (B) dry weight as percent of fresh weight of the whole plant (DW:FW), and (C) root dry weight as percent of whole-plant dry weight (R:WP). Values are means ± standard errors (n = 4), * = significant at the 0.05 probability level.

View larger version (17K): [in a new window]   Fig. 4. Effects of combinations of nutrient strength (10, 25, 50, and 100% Hoagland) and Pb concentrations on water spinach determined as (A) tolerance index (TI) for the weight increase (fresh weight) of the whole plant, (B) dry weight as percent of fresh weight of the whole plant (DW:FW), and (C) root dry weight as percent of whole-plant dry weight (R:WP). Values are means ± standard errors (n = 5), * = significant at the 0.05 probability level.