印染行业热定型机油烟废气检测方法研究

Study on a monitoring method of lampblack exhaust from calibrators of textile industry

建立了粘胶基活性炭纤维吸附—正己烷萃取—紫外分光光度法检测热定型机油烟废气的方法,以印染厂实际热定型机油烟废气萃取液为标准油烟,在230nm处测吸光度,绘制标准曲线,相关系数为0.9997。实验结果表明,正己烷1次萃取率超过了90%,紫外分光光度法标准偏差为0.344～0.693,相对标准偏差在5%内,平均加标回收率为93%～98%,方法检出限为0.829mg/L。粘胶基活性炭纤维耐高温,对0～100mg/L的热定型机油烟废气的饱和吸附量为1.0～2.5g/g。用Langmuir、Freundlich和DR方程对实验吸附等温线进行了拟合,低油烟浓度时Langmuir方程拟合较好,高浓度油烟时DR方程拟合较好。

In the present study,an analytical method was established to monitor the lampblack waste gas from calibrators. The waste gas was adsorbed by viscose rayon-based activated carbon fiber,and followed by N-hexane extraction,and the products were then detected by ultraviolet spectrophotometry. The extraction liquid of lampblack produced by dyeing and finishing industry was used as the sample for analysis. Ultraviolet absorption at 230 nm was measured,and standard curves were established with a correlation coefficient of 0.999 7. The experimental data indicated that the extraction efficiencies of N-hexane exceeded 90%,standard deviations were between 0.344 and 0.693,RSD values were lower than 5%,and the average recovery was between 93% and 98%. The D.L of this method was 0.829 mg/L. The adsorption capacity of the activated carbon fiber of the lampblack produced at high-temperature by calibrators were between 1.0 g/g and 2.5 g/g. The experimental data were analyzed with the Langmuir,Freundlich and DR absorption isotherms. The results showed that the Langmuir models fitted the experimental data well at low lampblack partial pressure,while the DR model fitted the experimental data better at high lampblack partial pressure.