The Determination Of Eight Organic Matters In The Air Of Coal Chemical Industry Workplace

A variety of toxic and hazardous substances in the air of coal chemical enterprises. many toxic and hazardous substances like dimethyl ether (DME); dimethylsulfoxide (DMSO); and acetone, isopropyl alcohol, butyl acetate, chloroform, ethylbenzene, xylene and so on come out in process of gasification. It’s common for these toxic and hazardous substances to escapes from equipments and evaporate into steam in workplace,as a result, will bring great harm to the health of the laborers.This research develops a method of determination of these harmful substances in the air of workplace, the main work are:1. A new GC method for the quantification of dimethyl ether in workplace air was developed. Seperation was achieved on Elite-WAX chromatographic column, using Carbon tetrachloride as solvent,with oven temperature programmed from40to90℃, and the flow rate of carrier gas programmed from1.4-2.5ml/min. Several different materials were compared on their enrichment effect to dimethyl ether,the best Enrichment effect was found from activated carbon (400/100mg).The assay was linear in the range3.5-38.3μg/ml, and the correlation coefficient is0.9999, the limit of detection was0.7μg/ml.The average recovery was98.7%, the average sampling efficiency in short time and long time collection of air samples with different concentrations of dimethyl ether was99.7%. This method was validated as having good linearity, accuracy, sensitivity and simple sampling preparation and can be used for determination of the dimethyl ether in workplace air.2. Establishment of a method for sampling and determination of the Dimethyl sulfoxide in workplace air. Samples were collected using Solvent resolved activated charcoal tube and resoluted with acetone. Seperation was conducted on Elite-WAX chromatographic column, with oven temperature programmed from80to180℃, and the flow rate of carrier gas programmed from2.0～2.5ml/min, reducing the interference of other substances. The assay was linear in the range26.9-215.0μg/ml, the correlation coefficient is0.9999, the limit of detection is26.6μg/ml.sampling volume7.51, the low detection concentration was3.6mg/m3. The activated carbon tubes are easy to get, samples require no complex pre-treatment, so it can be adopted in general laboratory. This method has been validated as being simple, practical, sampling efficiency and having good linearity and can be used for the determination of DMSO in the workplace air in large quantity and worthy of promotion.3. Establishment of a method for sampling and determination of the determination of the amount of acetone, isopropyl alcohol, butyl acetate, chloroform, ethylbenzene, xylene in workplace air at the same time. Samples were collected using Solvent resolved activated charcoal tube and resoluted with Carbon tetrachloride. Seperation was conducted on Elite-WAX chromatographic column, with oven temperature programmed from50to180℃, and the flow rate of carrier gas to1.0ml/min. In this method, acetone, isopropyl alcohol, butyl acetate, chloroform, ethylbenzene, xylene presented good linear relationship, correlation coefficient was all above0.999. This method proved to be convenient and high sensitive to meet the determination of the acetone, isopropyl alcohol, butyl acetate, chloroform, ethylbenzene, xylene in workplace air at the same time.