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§ 1065.267 Gas chromatograph with a flame ionization detector.
(a) Application. You may use a gas chromatograph with a flame ionization detector (GC–FID) to measure CH4 and C2H6 concentrations of diluted exhaust for batch sampling. While you may also use a nonmethane cutter to measure CH4, as described in § 1065.265, use a reference procedure based on a gas chromatograph for comparison with any proposed alternate measurement procedure under § 1065.10.