Accession Number : ADD011874

Title :   Variable Temperature Trap.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Clavell,C , Jr

Report Date : 21 Jun 1985

Pagination or Media Count : 10

Abstract : Heretofore, arriving at reliable figures for determination of organotin compound concentrations has been hampered due to the lack of a suitable device for trapping the compounds and making an analysis or detection of their presence and concentration. This has been particularly true in the case of seawater analysis where some of the organotin compounds have been leached into seawater from various anti-fouling coatings. The present invention is directed to providing an apparatus responsive to an external control for enabling a precise analysis of organotins in a gas sample by a detector. An elongate glass tube containing a small amount of granular absorbent material held between quartz fiber plugs is coupled to receive the gas sample and concentrate the organotins as well as being coupled to the detector for subsequent elution. An elongated temperature probe coaxially extends through the longitudinal chamber and into the absorbent material to provide an indication of temperature to the external control. A liquid nitrogen container is shaped to contain the portion of the elongated tube having the longitudinal chamber to lower the chamber's temperature below the temperature required for concentrating the organotins. A helically wound coil about the outside of the elongated tube heats the longitudinal chamber so that at discrete temperature levels a separation is effected and the organotins of interest are eluted from the chamber to the detector thereby allowing a precise analysis of the organotins of interest.

Descriptors :   *PATENT APPLICATIONS, *GAS ANALYSIS, *ORGANOMETALLIC COMPOUNDS, *TIN COMPOUNDS, ABSORBERS(MATERIALS), CHAMBERS, COILS, CONTAINERS, CONTROL, COUPLING(INTERACTION), DETECTION, DETECTORS, ELUTION, EXTERNAL, FIBERS, GLASS, INVENTIONS, LIQUID NITROGEN, MATERIALS, PLUGS, PRECISION, QUARTZ, RELIABILITY, SEA WATER, TEMPERATURE, TEMPERATURE MEASURING INSTRUMENTS, TIN, TRAPS, VARIABLES, ANALYZERS

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE