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In Situ Push–Pull Method to Determine Ground Water Denitrification in Riparian Zones

^a Dep. of Natural Resources Science, Coastal Institute in Kingston, Univ. of Rhode Island, Kingston, RI 02881
^b Dep. of Plant Sciences, Woodward Hall, Univ. of Rhode Island, Kingston, RI 02881

View larger version (85K): [in a new window]   Fig. 1. Schematic of the in situ push–pull mini-piezometer method.

View larger version (20K): [in a new window]   Fig. 2. Relative concentration profiles of SF6 from the 72- and 120-h conservative tracer push–pull pretests at Site A. The term C represents the concentration of the sample pulled from the mini-piezometer. The term Co represents the concentration of the dosing solution originally pushed into the mini-piezometer.

View larger version (19K): [in a new window]   Fig. 3. Relative concentration profiles of conservative tracers (SF6 and Br-) from the 72-h in situ nitrate push–pull test in one Site A mini-piezometer. The term C represents the concentration of the sample pulled from the mini-piezometer. The term Co represents the concentration of the dosing solution originally pushed into the mini-piezometer.

View larger version (12K): [in a new window]   Fig. 4. Ground water denitrification rates from the in situ nitrate push–pull test conducted at Site A. Values for mesocosm data are the mean (SE) of three replicate mesocosms (Addy et al., 1999) and values for push–pull data are the mean (SE) of three replicate mini-piezometers.

View larger version (11K): [in a new window]   Fig. 5. Ground water denitrification rates from the in situ nitrate push–pull test conducted at Site B. Values are the mean (SE) of four marsh and three fringe mini-piezometers.