Выпуск: 12 , Том: 77 , Год издания: 2022

Straight multicapillary columns (MCCs) with 40 m capillaries are used in portable gas analyzers. In order to increase the efficiency and speed of gas chromatographic separation, straight MCCs with a diameter of 25 m and a length of 200250 mm with an OV-5 stationary phase (film thickness, 0.10.2 m) were fabricated and their main chromatographic characteristics were determined. It was shown that the maximum specific efficiency of the MCCs was 25 600 theoretical plates/m and the separation rate reached 630 theoretical plates/s, which significantly exceed the corresponding values for 40 m MCCs. The test MCCs retained high separation efficiency in wide ranges of carrier gas flow rates: 30170 cm³/min for argon and nitrogen and 120420 cm³/min for helium. However, as compared to the 40 m columns, approximately twice the pressure was required to ensure the same flow of a carrier gas through the 25 m MCCs. A decrease in the diameter of MCC channels from 40 to 25 m made it possible to shorten the column length by about 1/3 with the retention of the column efficiency.