Overview. Gastric intubation via the nasal passage (ie, nasogastric route) is a common procedure that provides access to the stomach for diagnostic and therapeutic purposes.
The impact of pesticides consists of the effects of pesticides on non-target species. Pesticides are chemical preparations used to kill fungal or animal pests. Over 98% of sprayed insecticides and 95% of herbicides reach a destination other than their target species, because they are sprayed or spread across entire agricultural fields.
The method uses solid-phase extraction to remove pesticides from a water sample and then employs gas chromatography/mass spectrometry. The detection levels in many traditional methods are too high for studies on the fate of these pesticides in the environment. For some of these pesticides, but more importantly for the pesticides' degradates, methods to measure their concentration in water were not available. These methods are now being used by the U.S. Geological Survey's Toxics Program and NAWQA to assess the fate of these pesticides in the environment.