Persistent Organochlorinated Compounds in Norwegian Human Milk in 1979

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Abstract
The levels of the persistent organochlorine compounds HCB, sum‐DDT (1.1 DDE+1.1 DDD+DDT), DDE and PCBs were determined in 133 Norwegian human milk samples from 7 cities with various degrees of industrialization. All samples contained organochlorines. No dramatic geographical differences were observed. The average HCB, sum‐DDT, DDE and PCB levels in human milk were 2.1±1.0, 29.8±23.5, 25.8±20.3 and 23.9±13.7 p.p.b. respectively (126±128, 1440±950, 1270±850 and 1210±690 p.p.b. respectively in human milk fat) which are among the lowest reported. The present results were compared to Norwegian results from 1970 and 1976. A slight decrease in the average HCB levels was observed from 1976–1979. The average PCB levels which doubled from 1970–1976 showed no or only a slight increase from 1976–1979. The distinct decrease in average sum‐DDT levels observed from 1970–1976 continued during the period 1976–1979. The present survey demonstrated that human milk is a good indicator substance in monitoring the environment for contamination by organochlorine compounds. The results were evaluated toxicologically by comparison with maximum residue limits and acceptable daily intakes (FAO/WHO 1978). It was concluded that the present levels of organochlorines in Norwegian human milk did not represent any threat to the infants' health.

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