紫外光度法测定水中石油类物质的方法改进

Improvement of Petroleum Oil Determination in Water by Ultraviolet Spectrophotometry

针对紫外分光光度法测定水中石油类污染物时遇到的标准油选择和测定结果与红外光度法不一致的问题,研究了用红外光谱法中使用的混合烃作为标准物质、用硅酸镁吸附柱去除动植物油的可行性。结果表明,用混合烃作为紫外分光光度法的标准物质是可行的;用硅酸镁吸附柱可有效去除紫外分光光度法中动植物油对测定的干扰。石油醚萃取液经硅酸镁吸附柱吸附动植物油后,紫外分光光度法的测定结果与红外光谱法测定结果相一致。

As to the disagreement in the selection and determination of the standard oil with the result obtained from the infrared spectrophotometric method in the determination of the petroleum oil in water by ultraviolet spectrophotometry, the article discussed the feasibility of removing the oil in the animal and plant by using the mixed hydrocarbons in the infrared spectrophotometry as the standard oil and the magnesium silicate as the ad- sorption column. The result showed that the use of the mixed hydrocarbons as the standard material of the ultra- violet spectrophotometry is feasible, and the interference from the animal and vegetable oil can be effectively removed by the magnesium silicate adsorption column. The results determined by the ultraviolet spectrophotometry are well agreed with those obtained by the infrared spectrophotometry after the extractant is treated with the magnesium silicate adsorption column.