Abstract: The experiment uses ordinary and inexpensive GDX-401 polar packing as the stationary phase, FID as the detector, and temperature-programming. Under the conditions of appropriate high temperature and large carrier gas flow rate, domestic ordinary gas chromatograph can be used. The determination of volatile fatty acids in an anaerobic digestive fluid sample was completed more accurately within 5 minutes. The polarity of the volatile acid and the pH value of the measuring solution have influence on the measurement.
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