A determination of the apparent molar absorption coefficients of the cobalt thiocyanate complexes of nonylphenol ethylene oxide adducts

A canister-based sampling method along with preconcentrator-Gas chromatography-Mass Spectrometry (GC-MS) analysis was applied to ethylene oxide (EtO or EO) and 75 other volatile organic compounds (VOCs) in ambient air. Ambient air can contain a large variety of VOCs, and thorough analysis requires non-discriminatory sampling and a chromatographic method capable of resolving a complex mixture. Canister collection of whole air samples allows for the collection of a wide range of volatile compounds, while the simultaneous analysis of ethylene oxide and other VOCs allows for faster throughput than separate methods. The method presented is based on US EPA Method TO-15A and allows for the detection of EtO from 18 to 2500 pptv. The method has an average accuracy of 104% and precision of 13% relative standard deviation (RSD), with an instrument run time of 32 min. In addition, a link between canister cleanliness and ethylene oxide growth is observed, and potential mechanisms and cleaning strategies are addressed.

Download Full-text

Computerized model for accurate determination of ethylene oxide diffusion in sterilized medical supplies

Biomaterials ◽

10.1016/0142-9612(89)90076-8 ◽

1989 ◽

Vol 10 (5) ◽

pp. 343-348 ◽

Cited By ~ 6

Author(s):

C GIBSON ◽

I MATTHEWS ◽

A SAMUEL

Keyword(s):

Ethylene Oxide ◽

Accurate Determination ◽

Medical Supplies

Download Full-text

The determination of absorption coefficients from the photo-response of silicon Schottky barriers

Physics Letters A ◽

10.1016/0375-9601(83)90833-2 ◽

1983 ◽

Vol 95 (3-4) ◽

pp. 194-196

Author(s):

S. Mil'shtein ◽

Y. Brada

Keyword(s):

Schottky Barriers ◽

Absorption Coefficients ◽

Photo Response

Download Full-text

The Use of Reverse Mirage Spectroscopy to Determine the Absorption Coefficient of Liquid Methanol at CO2 Laser Wavelengths

Applied Spectroscopy ◽

10.1366/0003702894202003 ◽

1989 ◽

Vol 43 (1) ◽

pp. 148-153 ◽

Cited By ~ 9

Author(s):

Dane Bićanić ◽

Siegfried Krüger ◽

Paul Torfs ◽

Bruno Bein ◽

Frans Harren

Keyword(s):

Absorption Coefficient ◽

Co2 Laser ◽

Probe Beam ◽

Laser Emission ◽

Wavelength Region ◽

Experimental Setup ◽

Absorption Coefficients ◽

Experimental Conditions ◽

Liquid Samples

An experimental setup for performance of reverse mirage spectroscopy at CO2 laser wavelengths on liquid samples having high values of absorption coefficients is described. One and the same liquid is used as both the absorbing and deflecting medium. The Rosencwaig-Gersho theory has been applied, and the choice of experimental conditions that would enable determination of absorption coefficient β from the magnitude of photothermal signals measured at two different probe beam distances (probing locations) is discussed. The usefulness of this technique (essentially not inhibited by the requirements imposed on the sample's thickness) is tested on methanol having absorption coefficients β close to 300 cm−1 in the wavelength region covered by CO2 laser emission.

Download Full-text