ABSTRACT
<p><b>OBJECTIVE</b>To develop determination of dimethyl ether in workplace air by GC.</p><p><b>METHODS</b>Dimethyl ether were sampled with solvent desorption active carbon tube. The sampled carbon tube were desorbed by carbon tetrachloride, Elite-WAX column was used with temperature programmed from 40 to 90 degrees C, and the carrier gas programmed from 1.4 - 2.5 ml/min.</p><p><b>RESULTS</b>There was a good linearity (r = 0.9999) over the concentration of 0-63.91 microg/L, detection limit can reach 0.75 microg/ml.</p><p><b>CONCLUSION</b>This method proved to be accurate and sensitive, to meet the determination of the dimethyl ether in workplace air.</p>
Subject(s)
Air Pollutants, Occupational , Chromatography, Gas , Methods , Methyl Ethers , WorkplaceABSTRACT
Objective To study the effect of chest wall vibration therapy on bronchiolitis. Methods A total of 64 patients with bronchiolitis were divided into an experimental group and a control group, the former included 34 cases and the latter included 30 cases. The experimental group received both routine treatment and chest wall vi- bration, while the control group only received routine treatment. PaO_2, PaCO_2, SaO_2, Heart Rate (HR) and Respi- ration (R) were observed, respectively, in the experimental group and the control group at the beginning and the end of the third day. Time needed for expectoration and length of hospital stay in the two groups were observed. Results It was shown that PaO_2, PaCO_2, SaO_2 , HR, R were significantly improved at the end of the third day when compared with those at the beginning in both groups(P