萃取－同步荧光光谱法测定大气飘尘中苯并（a）芘

提出用浓Ｈ２ＳＯ４从大气飘尘样品的环己烧提取液中一次萃取后，用同步荧光光谱测定苯并（ａ）芘的方法。选用△λ为２０ｎｍ时可获最佳效果，用浓硫酸萃取的时间仅１ｍｉｎ，苯并（ａ）芘在浓硫酸相中１ｈ内稳定，样品加标的回收率为８５％，其它多环芳烃化合物在５３０—６００ｎｍ的测定波长范围不干扰苯并（ａ）芘的测定。用乙酰化滤纸层析－荧光分光光度的统一方法作为对比对实际样品进行了测定，结果与后者的偏差在±１５％以内，分析周期可缩短２４ｈ。

Extraction and Synchronous Fluorescent Spectrometry for the Determination of Benzo (a)pyrene in Airborne Particulates.

A rapid and effective method for detecting benzo(a) pyrene in airborne particulates was developed, in which benzo (a) pyrene was extracted in an one minute step with concentrated sulfuric acid from a cyclohexane extracted solution from the airborne particulates, and then determined with a synchronous fluorescent speetrometry. The best results were obtained at ac of 20urn.Benzo (a) pyrene in the concentrated sulfuric acid phase was stable within 1 hour.The recovery was found to be 85% for 0. 10 ig of benzo(a)pyrene standard. No interference with other polynuclear aromatic hydrocarbons was found in the range of 530-- 600 urn of synchronous fluorescent spectra. For a comparison, the samples were also determined by using the unified method of acetylized paper TLC/ fluorescent photospectrometry,with the results in a variance of 15% between both methods. The analytical cycle for the present method can shorten by 1 hour