[Study on the environmental pollution of PCBs].

OBJECTIVE: To investigate the environmental pollution of PCBs from the place where the disused transformers were taken apart. METHODS: Take town F as the high exposed district for investigating and the town P which 100 kilometres is away from the town F as the low exposed district. At the same time, take town DXG which is 500 kilometres away from town F as the district for contrast. It was random and stated to extract samples of piped water, farmland rice and eggs. Then, the exceed-mark-quantity detecting methods were used to detect the PCBs and TEOs level in these samples. RESULTS: The content of PCBs in the samples was different except for piped water. Thediversity of the PCBs level in the hen's eggs was the most significant, duck's eggs took second place and farmland was the least. The order of PCBs level in the samples was: hen' s eggs > duck's eggs > farmland > rice > river water ( stream) > piped water. CONCLUSION: The content of PCBs in each sample from Town F was higher than town P and town DXG on different levels. So the industry of taking the disused transformer apart had caused pollution of local environment.

[Case-matched study of pcbs toxiciy effects to women and children case in the areas which disused transformers were dismantled].

OBJECTIVE: To Study the health-related effects of PCBs pollution to women and children living near the dismantling factories of disused transformers. METHODS: 49 couples which include a pair of preschool child(8 - 10 years old) and his/her mother were matched as the objects from the central junior school of F neighborhood where the study was progressing. Fasting Venous blood was collected from the objects, in which the content of PCBs (including 13 isomers) was determined by ultrasonic trace analyses methods as well as blood and urine were subjected to biochemical test while investigation by questionnaire and physical examination were also required. RESULTS: The mean content(G) of PCBs is 176ng/g lipid in the venous blood of the women and 192 ng/g lipid in that of the children. There are 6% of the females found blood pressure abnormality in the physical examination, while 28% of those were found urinary routine abnormality and 4% lymph node tumefaction. Among the children, 82% of them were suffered from caries, 6% were found lymph node tumefaction and 16% urinary abnormality. CONCLUSIONS: Both the results of the blood and urine biochemical analyses as well as the physical examination indicated the prevalent abnormal status of the women and children in the area. The accumulating concentration of the PCBs in blood suggested that the dismantling of the disused transformers had resulted in a noticeable negative effect to the local environment.