Cohesionless cores were consistently retrieved, aseptically extruded from the core barrel inside an anaerobic environmental chamber, and preserved in the field. The physical, chemical, and biological integrity of discreet soil intervals was maintained for laboratory analysis. Statistical analysis of repeated collection of soil samples from the same depth intervals in nearby boreholes was documented. 5 NAL Call. 1992 Jul. Includes references.
Immunoassays offer the potential of rapid, inexpensive, sensitive and specific detection methods.
This paper presents a flow injection system that is based on an immunochemical reaction and which provides the opportunity for automated, quasi- continuous measurements for screening water samples for the presence of pesticides. It is possible to measure in the range of interest of the 0.1 micrograms litre-1, which is the limiting value of the European drinking water directive. Measurements were made for the triazine herbicides atrazine and propazine, which both cross-react with the polyclonal antiserum used. Furthermore, this device includes a new development of a membrane reactor for the exchange of used biological material, in this case antibodies. 8 NAL Call.