Abstract
The recovery of six herbicides (triclopyr, triclopyr ester, sulfometuron methyl, metsulfuron methyl, imazapyr, and hexazinone) was evaluated in two stream water samples, one from Weogufka Creek in the Alabama Piedmont and one from a stagnant stream in the Escambia Experimental Forest near Florida. Simulated field study conditions were used to evaluate collection, ambient (pre-retrieval) field storage, and freezer storage phases of stream water sampling. Method detection levels were developed for each herbicide in each water matrix. None of the herbicides degraded significantly in either stream water after 24 days at 22C to 25C or after 12 months of freezer storage below -15C. None of the herbicides tested appeared to leach from the automatic sampler tubing into subsequently collected samples. However, slight carryover of about 0.8% of the spiking level was observed in the first post-spike blanks collected for all herbicides. This appeared to be the result of physical adhesion of water droplets on tubing walls; no detectable carryover was observed in subsequent blanks. These results support the use of HDPE sample containers and flexible PVC automatic sampler tubing in environmental fate studies of herbicides.
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