[Determination of chloroform and carbon tetrachloride in residential air by capillary gas chromatography].

ABSTRACT

OBJECTIVE: To establish solvent desorption capillary gas chromatography method for determination of chloroform and carbon tetrachloride in residential air. METHODS: The sample was absorbed by active carbon glass tube, then desorbed by Acetone and determined by Capillary Gas Chromatography. RESULTS: Linear range of this method: 5.0 x 10(-4)-1.0 x 10(-1) mg/m3 for chloroform, 1.9 x 10(-4)-1.0 x 10(-2) mg/m3 for carbon tetrachloride. The sample could be stored in the active carbon glass tube for 7 days. The re-occurrence rate of this method is good. RSD is 0.41%-1.54% for chloroform, 0.31%-1.03% for carbon tetrachloride. Detection limit of this method: 1.5 x 10(-3) ng for chloroform, and 5.8 x 10(-4) ng for carbon tetrachloride. Recovery rate for different concentrations 88.5%-98.6% For chloroform, and 91.0%-99.0% for carbon tetrachloride. Sampling efficiency 93.7%-99.2% for chloroform, and 90.6%-99.2% for carbon tetrachloride. Other Volatile halogenated hydrocarbons with similar structures and similar nature in the residential air do not interfere the measurement. CONCLUSION: The method was easy and quick, with high sensibility. It was applicable to monitor the chloroform and carbon tetrachloride in residential air.