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Accumulation of Perchlorate in Aquatic and Terrestrial Plants at a Field Scale

^a Department of Civil Engineering, Texas Tech University, Lubbock, TX 79410
^b The Institute of Environmental and Human Health, Texas Tech University, Lubbock, TX 79409-1163

View larger version (55K): [in a new window]   Fig. 1. Locations of study sites at the Naval Weapons Industrial Reserve Plant (NWIRP), McGregor, TX.

View larger version (29K): [in a new window]   Fig. 2. Distribution of trees sampled along a defined reach of HW84 Sidestream (not to scale). All tress were tagged with different numbers.

View larger version (29K): [in a new window]   Fig. 3. Perchlorate concentrations in surface water at different stream sites from June 2001 through October 2002. Points not connected by solid lines indicate that data are missing because water samples were not taken.

View larger version (34K): [in a new window]   Fig. 4. Relationship between ClO–4 bulk water concentration and plant tissue concentration at different sampling locations for smartweed (n = 19, P 0.0001).

View larger version (30K): [in a new window]   Fig. 5. Relationship between ClO–4 bulk water concentration and plant tissue concentration at different sampling locations for watercress (n = 30, P 0.0001).

View larger version (27K): [in a new window]   Fig. 6. Perchlorate seasonal distribution in tree leaves along a defined reach of HW84 Sidestream. Standard deviation bars represent the standard deviation of duplicates (n = 2) for selected trees sampled in October 2002. In cases where error bars are not shown, there is no duplicate.