Abstract: The present invention discloses a plunger adaptor/collet nut component that connects to the plunger of a down hole pump on the plunger adaptor end and a pull tube on the collet nut end. The pull tube extends through a top seal assembly and into a bushing/collet nut component located above the top seal assembly. In the preferred embodiment, the plunger adaptor/collet nut component is dimensioned such that a 1.125 inch diameter pull tube can connect to the collet nut while the plunger adaptor is dimensioned such that it can connect to the top of plungers for larger diameter pumps such as 1.75 inch and 2.0 inch down hole pumps. The bushing/collet nut component of the preferred embodiment is dimensioned such that the collet nut attaches to the top of the pull tube guide and permits a 1.125 inch diameter pull tube to pass through it while the bushing is dimensioned to accommodate the smaller 1.

Abstract: An immunoassay directed at certain analytes that are polyaromatic hydrocarbons, such that the immunoreactive standard used for assay calibration allows the creation of calibration solutions of superior stability.

Abstract: Kits and processes for detecting analytes present in solid materials, especially soil or foodstuffs. The kits and processes utilize a tubular apparatus, fitted or fittable with a piston, cap and filter, as a scoop and both to extract the analyte from the solid material into the extraction liquid and to separate the extraction liquid from the solid material.

Abstract: Improvements in immunoassays for chlorpyrifos and compounds structurally related to chlorpyrifos are achieved by using standards of increased stability.