Determination of mercaptans at microgram-per-cubic-meter levels in air by gas chromatography with photoionization detection
A method for the gas chromatographic (GC) determination of ethyl, tert-butyl, propyl, sec-butyl, and n-butyl mercaptans in air using a photoionization detector (PID) was established by using air sampling bags. Up to 5 mL of sample was injected into a Hewlett-Packard Model 588OA GC fitted with a 9 ft glass column packed with 100/120 mesh Chromosorb W AW DMCS and coated with 15% SF-96 and 6% OV-225. The oven was held at 65 /sup 0/C and the nitrogen flow rate was 30 mL/min. The photoionization detector was attached to the GC and held at 200 /sup 0/C. The GC detection limit was determined to be 0.06 ng for n-butyl mercaptan and 0.02 ng for the remaining mercaptans with precisions (n = 8, 1sigma, 4 ng) of +/- 7.3, +/- 8.5, +/- 8.1, and +/- 10% for ethyl, tert-butyl, propyl, sec-butyl, and n-butyl mercaptan, respectively. With a 5-mL injection volume, sensitivity is about 2 ..mu..g/m/sup 3/ which is as sensitive as detection by smell since the oder threshold is about 2-4 ..mu..g/m/sup 3/.
- Research Organization:
- Toxicology Inst., Albany, NY
- OSTI ID:
- 5410745
- Journal Information:
- Anal. Chem.; (United States), Vol. 54:6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AIR
QUANTITATIVE CHEMICAL ANALYSIS
THIOLS
GAS CHROMATOGRAPHY
ADSORBENTS
AIR POLLUTION
AIR SAMPLERS
DETECTION
EXPERIMENTAL DATA
HIGH TEMPERATURE
ODOR
PHOTOIONIZATION
SILICA GEL
CHEMICAL ANALYSIS
CHROMATOGRAPHY
DATA
EQUIPMENT
FLUIDS
GASES
INFORMATION
IONIZATION
LABORATORY EQUIPMENT
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
ORGANOLEPTIC PROPERTIES
POLLUTION
SAMPLERS
SEPARATION PROCESSES
400100* - Analytical & Separations Chemistry