Tuinstra L G, Traag W A, Keukens H J
J Assoc Off Anal Chem. 1980 Sep;63(5):952-8.
A method is described for determining individual polychlorinated biphenyls (PCBs) in milkfat at the ppb level. Extraction and major cleanup are done simultaneously by saponification of the milkfat. After final cleanup on basic alumina, the concentrated extract is injected under splitless conditions on a capillary column coated with CPSil 7 stationary phase. The recovery of several individual PCBs from milkfat at a level of 25 ppb is better than 80%. The reproducibility for duplicates analyzed on several days showed standard deviations from 0.2 to 0.9 ppb for 19 individual chlorinated biphenyls. Some preliminary results for 165 samples of milkfat are reported.
描述了一种测定乳脂中十亿分之一水平的单个多氯联苯（PCBs）的方法。通过乳脂皂化同时进行提取和主要净化。在碱性氧化铝上进行最终净化后，将浓缩提取物在不分流条件下注入涂有CPSil 7固定相的毛细管柱。从乳脂中回收浓度为25 ppb的几种单个多氯联苯，回收率高于80%。在几天内对重复样品进行分析的重现性表明，19种单个氯化联苯的标准偏差为0.2至0.9 ppb。报告了165个乳脂样品的一些初步结果。
