消泡剂硅油Ⅰ在苯胺测定中的应用

Use of Dimethyl Silicone Oil for Defoaming in the Measurement of Aniline.

用预蒸馏—重氮偶合比色法测定印染废水中的苯胺时,蒸馏过程中大量的泡沫出现,是影响测定结果准确度的重要因素。本研究对色泽很深,含酚量较高的废水加入消泡剂硅油Ⅰ以抑制蒸馏产生的泡沫。结果表明在100ml水样中加硅油10.05—0.5ml即可收到理想效果。硅油Ⅰ性质稳定,不随水蒸汽蒸出。对测定无干扰。标准加入回收率为91.6％—97.3％,蒸馏得率平均为96％。

This paper deals with the use of a dimethyl silicone oil (Silicone Oil I ) as a defoaming agent in the measurement of aniline present in a textile dyeing and printing wastewater which has a quite dark colour and a higher content of phenols. In the pre-distillation-diazotization-colorimetric determination of the above aniline, a large volume of foams formed during the distillation is an important factor affecting the precision of results and can be defoamed by adding the above silicone oil. It has been found that the addition of 0. 05-0. 5ml of silicone Oil I 100ml of water sample can give a desirable result. Sili- cone Oil I has a stable property, will not be vaporized out with steam and will not interfere with the measure-to ment. The recovery of standard reference added is 91. 1-97. 3% and the yield by distillation is 96% on average,