Abstract
Room-temperature phosphorescence (RTP) signals on solid substrates depend on certain experimental parameters, including type of solid substrate, drying and cooling times of the sample—solid substrate system, presence of heavy atoms, and presence of quenching concomitants. RTP of 13 solid substrates is examined using 4-chlorobiphenyl as a model compound to determine the best conditions for maximum RTP intensity. It is found that Whatman No. 1 filter paper is the most suitable solid substrate for RTP of 4-chlorobiphenyl. The best method for drying the sample is heating in an oven at 110 °C for 15 min and cooling in a pure nitrogen gas stream inside the sample compartment for 10 min. RTP characteristics of biphenyl, several polychlorinated biphenyls (PCB) congeners, and Aroclors are presented in the absence and presence of thallium ion as an external heavy atom. It is found that it is not possible, under the experimental conditions described, to determine one congener in the presence of another. RTP is, however, shown to be a selective, rapid, inexpensive technique for the determination of individual PCBs with relative standard deviation between 2 and 10 and about 100-pg limits of detection for most compounds.
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