ASTM D5845 Standard Test Method for Determination of MTBE, ETBE, TAME, DIPE, Methanol, Ethanol and tert-Butanol in Gasoline by Infrared Spectroscopy
6. Apparatus
6.1 Mid-IR Spectrometric Analyzer, of one of the following types:
6.1.1 Filter-based Mid-IR Test Apparatus - The type of apparatus suitable for use in this test method minimally employs an IR source, an infrared transmission cell or a liquid attenuated total internal reflection cell, wavelength discriminating filters, a chopper wheel, a detector, an A-D converter, a microprocessor, and a sample introduction system.
6.1.2 Fourier Transform Mid-IR Test Apparatus - The type of apparatus suitable for use in this test method employs an IR source, an infrared transmission cell or a liquid attenuated total internal reflection cell, a scanning interferometer, a detector, an A-D converter, a microprocessor and a sample introduction system.
6.1.3 Dispersive Mid-IR Test Apparatus - The type of apparatus suitable for use in this test method minimally employs an IR source, an infrared transmission cell or a liquid attenuated total internal reflection cell, a wavelength dispersive element such as a grating or prism, a chopper wheel, a detector, an A-D converter, a microprocessor and a sample introduction system.
7. Reagents and Materials
7.1 Samples for Calibration and Quality Control Check Solutions - Use of chemicals of at least 99 % purity is highly recommended when preparing calibration and quality control check samples. If reagents of high purity are not available, an accurate assay of the reagent must be performed using a properly calibrated GC or other techniques (for example, water determination).
7.1.1 Base gasolines containing no oxygenates,
7.1.2 Methanol,
7.1.3 Ethanol,
7.1.4 tert-Butanol,
7.1.5 Methyl tert-butyl ether, MTBE,
7.1.6 Ethyl tert-butyl ether, ETBE,
7.1.7 tert-Amyl methyl ether, TAME, and
7.1.8 Diisopropyl ether, DIPE.
7.2 Warning - These materials are flammable and may be harmful if ingested or inhaled.
