Abstract
A new method based on cataluminescence (CTL) generated on the surface of nanosized Bi <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> was proposed for direct determination of benzene in air. Trace benzene was firstly absorbed on active carbon at room temperature to concentrate, then desorbed at 130°C to inject. The method showed high selectivity to benzene at wavelength of 440 nm, satisfying activity at reaction temperature of 315°C and good stability at air carrier flow rate of 135 ml/min. The linear range of CTL intensity versus concentration of benzene was 0.3~75 mg/m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> (γ=0.9991), and the detection limit (3σ) was 0.1 mg/m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> . The recovery of testing benzene in 5 artificial air samples by this method was 96.9%-105.0%. This method allowed rapid determination of benzene in air.
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