Abstract
Abstract A sensitive GC-ECD method has been developed for the determination of chlorinated biphenyl (CB) congeners in human umbilical cord tissues. The process of developing this method, from a method aimed primarily at high levels of CBs in seal blubber, is described. Small factorial experiment designs were found to be very useful during method development. The use of control samples and control charts as a method development tool is demonstrated. An initial estimate of the precision of the method was made from four duplicate measurements of a control sample, with a concentration of CBs ranging from 0.5 to 10 ng per sample extract. The precision was found to be 3–10% with a single exception of 17% (CB-138). The precision of the lipid determination step was 6%.
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