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用二氯甲烷作为煤焦油的萃取剂,选择了最佳萃取条件。测量波长λ_(max)=272nm,标准油浓度在0～55mg·1~(-1)范围内遵守比耳定律。废水样含油量测定的变动系数小于4%(n=8),回收率高于95%。
With dichloromethane as the extractant of coal tar, the best extraction conditions were chosen. The measurement wavelength λ max (max) = 272 nm, the standard oil concentration in the range of 0 ~ 55 mg · 1 -1 obeys Beer’s law. The coefficient of variation for the determination of oil content in wastewater samples was less than 4% (n = 8) and the recovery was higher than 95%.