Application of the Method of Gas Chromatography-Mass Spectrometry with a Pre-Dispersive Liquid-Liquid Microextraction to Determination of Low Rocket Kerosene Content in Water
A sensitive technique of rocket kerosene determination in water comprising dispersive liquid-liquid microextraction of analytes and their subsequent separation and determination by gas chromatography-mass spectrometry in the mode of chromatogram registration for the selected ions ( <i>m</i>/ <i>z</i>: 67, 81, 85, 95, 136, 137, 174, 183 and 193) is developed. The effect of the nature, amount of extractant and dispersant agents, salt adding and time of extraction on the efficiency of analyte extraction is studied. The detectable concentrations range within 0.005 - 0.05 mg/liter. The detection limits ( <i>S</i>/ <i>N</i> = 3) for kerosene RG-1 and T-1 are 0.0015 and 0.0022 mg/liter respectively. Intra-day and inter-day precision of the results of measurements for the studied concentration ranges from 16 to 9% ( <i>n</i> = 3), and from 20 to 12% ( <i>n</i> = 5), respectively.