Abstract: A method for conducting field dissipation and leachate studies of a test substance includes the step of positioning a boundary column for defining a soil test zone into the ground. This may be done by driving the column into the ground. Next is the step of exposing a bottom end of the column substantially without disturbing the soil in the soil test zone. This is followed by the steps of collecting leachate from the soil test zone and analyzing the leachate collected. The method also includes the steps of recovering the soil test zone substantially intact as a core sample, cutting the core sample into segments and individually analyzing the segments for test substance dissipation both quantitatively and qualitatively. The column utilized to define the soil test zone is preferably constructed from 18 or 20 gauge galvanized steel and has a diameter of from 6 to 10 inches.

Abstract: An apparatus for the collection of volatiles includes a housing that forms an environmental chamber. Dishs of test sample are placed in this chamber which is closed with a transparent cover. A gasket assures an airtight seal between the cover and the housing. The housing is supported on a stand that allows the angular orientation of the housing to be adjusted relative to the path of the sun. A jacket is also formed in the housing about the environmental chamber. A heat exchange fluid is circulated through this jacket to maintain the environmental chamber and, thus, the test sample within a desired temperature range. Volatiles emitted by the test sample are collected by circulating air through the environmental chamber. This air which passes across the test sample dishes serves to sweep up the volatiles which are then delivered to a collection trap for qualitative and quantitative analysis.

Abstract: An apparatus for the collection of volatiles includes a housing that forms an environmental chamber. Dishes of test sample are placed in this chamber which is closed with a transparent cover. A gasket assures an airtight seal between the cover and the housing. The housing is supported on a stand that allows the angular orientation of the housing to be adjusted relative to the path of the sun. A jacket is also formed in the housing about the environment chamber. A heat exchange fluid is circulated through this jacket to maintain the environmental chamber and, thus, the test sample within a desired temperature range. Volatiles emitted by the test sample are collected by circulating air through the environmental chamber. This air which passes across the test sample dishes serves to sweep up the volatiles which are then delivered to a collection trap for qualitative and quantitative analysis.

Abstract: An apparatus module for volatile collection, such as may be utilized in solution photolysis of a test sample, includes a vessel member that is sealingly connected to a vapor collection adapter. The vapor collection adapter includes an inlet for the delivery of gas into the vessel and an outlet for directing gas and volatiles emitted by the test sample from the vessel. The vessel member is elongated and mounted in a generally upright position by means of a peg that extends from a closed end of the vessel. This peg is received within an aperture in an underlying support rail. The apparatus is also specially adapted for mounting in series. More specifically, the support rail includes a series of equally spaced apertures for holding a number of modules at evenly spaced intervals. In addition, cooperating ball and socket connectors are provided at the distal ends of the inlet and outlet so as to allow sealed connection of adjacent modules together.

Abstract: A number of pyrethroid insecticides are photolabile, thus limiting their use outdoors. The non-photolabile pyrethroids often have the disadvantage of lasting too long when used outdoors. Herein, certain toxicologically acceptable compounds are designated which stabilize the normally photolabile pyrethroids and allow them to be used for an extended time period out of doors. The stabilizers have an electron deficient .pi. system and serve to decrease the rate of the photochemical decomposition of the pyrethroid at a given light level.