THE EFFECTS OF AIR AND HELIUM ON THE PERFORMANCE OF THE ION-TRAP DETECTOR WHEN USED FOR REAL-TIME MONITORING OF SOME ATMOSPHERIC POLLUTANTS

被引:17
作者
CAMERON, D
HEMBERGER, PH
ALARID, JE
LEIBMAN, CP
WILLIAMS, JD
机构
[1] LOS ALAMOS NATL LAB, DIV CHEM & LASER SCI, LOS ALAMOS, NM 87544 USA
[2] PURDUE UNIV, DEPT CHEM, W LAFAYETTE, IN 47907 USA
关键词
D O I
10.1016/1044-0305(93)80034-V
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
The feasibility of using an ion trap detector for real-time monitoring of volatile organic compounds in atmospheric samples is demonstrated. Detection limits in the low part-per-million to low part-per-billion ranges are achieved with an operating dynamic range of at least 5 orders of magnitude. Sample introduction through semipermeable membranes and molecular leak valves was evaluated. The membrane introduction method provided detection limit enhancements of 10-300 times over the molecular leak method. The effects of partial pressure from air and helium buffer gas were studied, and it was determined that, for optimum amounts of air, the helium buffer gas had no apparent effect on sensitivity or resolution. Air acts as the buffer gas to enhance ion signals by collisionally damping ion motion. The enhancement of molecular ion abundance at high partial pressures of air is postulated to be due to charge exchange and possibly collisional stabilization reactions.
引用
收藏
页码:774 / 781
页数:8
相关论文
共 47 条
[1]  
ARNOLD NS, 1989, 37TH P ANN ASMS C MA, P1425
[2]  
ASANO KG, 1988, 36 ASMS C MASS SPECT, P636
[3]   MASS-SELECTION OF REACTANT IONS FOR CHEMICAL IONIZATION IN QUADRUPOLE ION TRAP AND TRIPLE QUADRUPOLE MASS SPECTROMETERS [J].
BERBERICH, DW ;
HAIL, ME ;
JOHNSON, JV ;
YOST, RA .
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES, 1989, 94 (1-2) :115-147
[4]  
BERBERICH DW, 1991, 39TH P ANN ASMS C MA, P1279
[5]   CONTINUOUS MONITORING DEVICE FOR THE COLLECTION OF 23 VOLATILE ORGANIC PRIORITY POLLUTANTS [J].
BLANCHARD, RD ;
HARDY, JK .
ANALYTICAL CHEMISTRY, 1986, 58 (07) :1529-1532
[6]   PROCESS ANALYTICAL-CHEMISTRY [J].
CALLIS, JB ;
ILLMAN, DL ;
KOWALSKI, BR .
ANALYTICAL CHEMISTRY, 1987, 59 (09) :A624-&
[7]  
CAMERON D, 1990, 38TH P C MASS SPECTR, P61
[8]  
CANNON DR, 1986, IND CHEM NEWS, V7, P1
[9]   URBAN OZONE AND ITS PRECURSORS - RELIABLE MEASUREMENTS AND ROBUST STATISTICS ARE PREREQUISITES FOR MORE EFFECTIVE OZONE CONTROL [J].
CHOCK, DP ;
HEUSS, JM .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1987, 21 (12) :1146-1153
[10]   FIELD SCREENING OF HAZARDOUS-WASTE SITES .1. [J].
CHUDYK, W .
ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1989, 23 (05) :504-507