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测定石油中微量硫,库仑法快速灵敏。该法分为氧化法和还原法。Wallace等曾对两法进行过比较。由于氧化法较简便,目前国内外多采用此法并用电位法指示终点;进样速度不超过0.2微升/秒,进样体积不超过10微升。如能提高进样速度,加大进样量,将有利于提高测定灵敏度和准确度。本文在氧化库仑法中采用快速进样(0.5微升/秒)并加大进样量;用电流法指示终点,指示电极使用大面积螺状的双铂电极,用国产的普通笔录式极谱仪观测和记录指示电流的变化也能达到较高的灵敏度。使用方便,易于推广。该法用于测定含硫量0.5ppm.的石脑油仍能获得满意的结果。
Determination of trace sulfur in oil, coulometry fast and sensitive. The law is divided into oxidation and reduction. Wallace et al. Have compared the two methods. As the oxidation method is more convenient, at home and abroad to use this method and the end point of the potential method; injection speed does not exceed 0.2 l / s, injection volume does not exceed 10 l. If you can increase the injection speed, increase the injection volume, will help to improve the determination of sensitivity and accuracy. In this paper, rapid injection (0.5 microliters / second) and increase the injection volume in the oxidized coulometry; the end point is indicated by the current method, indicating that the electrode using a large area of the screw double platinum electrode, with domestic ordinary record-type polarographic Observations and recordings indicate that current changes can also achieve higher sensitivity. Easy to use, easy to promote. The method used to determine the sulfur content of 0.5ppm naphtha can still get satisfactory results.