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Your search keyword '"Chai, Xinsheng"' showing total 27 results
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27 results on '"Chai, Xinsheng"'

24. UV-Light-Activated ZnO Fibers for Organic Gas Sensing at Room Temperature

Author

Gong, Jian, Li, Yinhua, Chai, Xinsheng, Hu, Zeshan, and Deng, Yulin

Abstract

The UV irradiation enhanced ZnO fiber sensors for organic gas detection at room temperature are reported in this paper. It has been well-known that the conductivity of ZnO fibers will increase when they are exposed to UV irradiation. However, it was found in this study that the trend of the conductivity increase under UV irradiation could be reversed if the organic gases adsorbed on the ZnO fiber surface. It was found that a linear relationship exists between the current response and the concentration of the organic gas. The results exhibited simple maneuverability for detecting parts per million concentration of organic gases at room temperature. The possible mechanism of photoconduction sensing for detecting an organic gas under UV light irradiation at room temperature is also discussed.

Published
2010
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26. [Rapid determination of ammonia nitrogen in sewage by headspace gas chromatography].

Author

Peng R, Liu H, Chai X, and Jiang R

Abstract

This paper reports a novel method for the rapid determination of ammonia nitrogen in sewage by headspace gas chromatography (HS-GC) through a chemical reaction. During the experiment, formaldehyde, initially in excess, was reacted with NH 4 + in a headspace bottle to produce a strong acid with equal molarity. Thereafter, NaHCO 3 was reacted with the newly generated acid to produce CO 2 . In the final step, the released CO 2 was determined using a gas chromatograph equipped with a thermal conductivity detector. Good linear correlation between the ammonia nitrogen content and the gas chromatographic signals was achieved. The observed correlation coefficient was 0.999, and the limit of quantification (LOQ) was 0.786 mg/L (measured based on the mass concentration of N). The relative standard deviation of reproducibility was less than 2%, and the standard recovery was between 95% and 105%. Compared with Nassar's reagent method, the relative deviation of this method is within ±5%. This method has high detection efficiency and is suitable for the rapid batch detection of ammonia nitrogen in sewage.

Published
2019
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