Injection of a gas equilibrated with a liquid into the gas chromatograph

Gas chromatographic determination of trace amounts of sulfur compounds in industrial effluents

“…To avoid losses of the analyte in the course of sampling, preparation for analysis, and injection in the chromatograph we used glass vessels of variable volume. For this purpose, we chose large volume hypodermic syringes (50-100 ml) in which a sealing device is attached to the tip (14). This glass device with a variable inner volume permits sampling practically without any loss of volatiles, achieves equilibrium distribution of compounds between the liquid and the gas, allows addition of any liquid or gaseous reagents, storage for long times, and even to transport samples to remote places if desired.…”

“…This glass device with a variable inner volume permits sampling practically without any loss of volatiles, achieves equilibrium distribution of compounds between the liquid and the gas, allows addition of any liquid or gaseous reagents, storage for long times, and even to transport samples to remote places if desired. When used in combination with a gas sample valve, this device permits injection of the equilibrium gas into the chromatographic column (14). When utilizing a thermo- 1.…”

“…Actually, our technique of determining traces of sulfur compounds in industrial effluents is as follows. A sample of the solution to be analyzed of volume Vl without the gas phase is drawn into the variable-volume device (14). A 1:1 KC1-HC1 buffer solution of pH 2 containing 14% of sodium sulfate is added through the elastic rubber plug with the help of a hypodermic syringe to the sample.…”