Modification and Evaluation of a Microwave Plasma/Atomic Emission Detector System.
NIOSH 1992 May:36 pages
Modifications made to an Applied Chromatography Systems plasma emission detector and the evaluation of the performance of the modified instrument were described. The detector modified was the MPD-850. The overall performance of the modified equipment was much improved for carbon (7440440) determination relative to that found for the original instrument. Limits of detection were somewhat higher for the other elements examined in this study including hydrogen (1333740), fluorine (7782414), chlorine (7782505), bromine (7726956) and iodine (7553562). The carbon response for seven of the compounds examined in the study did not appear to be compound dependent when the helium flow rate was 70 milliliters/minute. Toluene (108883) and 2-chlorobutane (78864) responses were lower than expected. Carbon responses for two fluorinated compounds were also low, possibly as a result of a fluorine/quartz tube wall interaction. Modification of the original system included replacement of the 1/4 gamma cavity with a Beenakker TM010 cavity, replacement of the gas flow control unit with electronic mass flow controllers, addition of valves and plumbing associated with a solvent venting scheme, and construction of a gas chromatographic/plasma interface.
NIOSH-Author; Analytical-chemistry; Chemical-analysis; Chromatographic-analysis; Analytical-methods; Analytical-processes; Analytical-instruments; Halogens;
7440-44-0; 1333-74-0; 7782-41-4; 7782-50-5; 7726-95-6; 7553-56-2; 108-88-3; 78-86-4;
NTIS Accession No.
Division of Physical Sciences and Engineering, NIOSH, U.S. Department of Health and Human Services, Cincinnati, Ohio, 36 pages, 10 references