Using thermogravimetry for weight loss monitoring of permeation tubes used for generation of trace concentration gas standards.
Permeation tubes are convenient analyte sources for generating standard gas mixtures (containing, in particular, volatile organic compounds) used in the calibration of analytical instruments. For small permeation rates, corresponding to trace levels of analytes, the calibration of permeation tubes is time-consuming. The use of thermogravimetry as a means to measure rapidly the weight loss at constant temperature was investigated. An attempt to apply this technique to calibrating a permeation tube filled with benzene is described. In the 20 ng/min range of permeation rate, day-to-day variations of <5% were observed. The continuous weight loss monitoring of permeation tubes by thermogravimetry allows their rapid characterization.
Maria
Pierre-Charles
PC
Chimie des Matériaux Organiques et Métalliques, Faculté des Sciences, Université de Nice-Sophia Antipolis, France.
Gal
Jean-François
JF
Balza
Marta
M
Peré-Trepat
Emma
E
Tumbiolo
Simonetta
S
Couret
Jean-Marie
JM
D000393:Air Pollutants / Q000032:analysis* / Q000592:standards; D004784:Environmental Monitoring / Q000295:instrumentation* / Q000592:standards; D005740:Gases / Q000592:standards; D009930:Organic Chemicals / Q000032:analysis; D012015:Reference Standards
D000393:Air Pollutants; D005740:Gases; D009930:Organic Chemicals