REP00670 - Laserfiche WebLink

Home Browse Search

Battle Mountain Resources, Inc. ' 06 July 1993 Page 6 ' components are accomplished through the use of hypodermic needles, flexible seals, and induced pressure gradients. Solution samples are collected in sealed, pressurized, glass ' vials which can be sent directly to the laboratory. The system makes it possible to collect pressurized solution ' samples without the necessity of purging large amounts of fluid or transferring samples to other containers, a procedure which often results in a loss of volatile chemical constituents through volatilization or external contaminat- ' ion. The primary feature of the system is the filter tip, the standard configuration of which consists of a thereto-plastic body and a filter of high density polyethylene. The filter tip is reinforced with a core of teflon coated stainless t steel and sealed with a flexible septa of resilient teflon or fluororubber depending upon the project QA/QC requirements. Solution samples are obtained by inserting a pre sterilized, ' pre-evacuated glass sample vial into a sample container housing and then lowering it down the extension rods. At the lower end of the housing is a spring loaded "guide sleeve" ' assembly which houses a double-ended hypodermic needle. The glass vial contains a flexible septa similar to those in the filter tips. Contact between the guide sleeve and the filter tip causes the needle to puncture the septa in both the cap and the sample vial. The vacuum in the vial then draws solution fluids, through the filter tip and intro the vial. Withdrawing the sampler housing allows the needle to ' withdraw from both the sample vial and the filter tip. The guide sleeve mechanism causes the needle to withdrawal from the sample vial first, thus preventing a loss of sample fluid. The septa in both the filter tip and the sample vial ' automatically reseal as the needle is withdrawn. One of the major advantages of the system is that only the ' small amount of fluid contained in the filter tip itself, must be purged from the system prior to sampling. The system essentially eliminated the sources of physical, ' chemical, and human error normally associated with solution sampling. Due to the low coefficients of permeability, however, ' solution sampling was not achieved within a reasonable amount of time and the activity was abandoned. TERRA TECHNOLOGIES -SOUTH WEST, INC.