Cadmium exposure pathways in the Czech urban population.

The article describes the exposure pathways of cadmium in the Czech urban population. The data on Cd concentrations originated from the Environmental Health Monitoring System, which has been realized in 30 cities since 1994. The data on cadmium content in particular exposure pathways - diet, drinking water, ambient air and soil -were processed for the period 1994-2003. The estimate of the daily dietary intake for an average adult population amounted to 11-19 microg/d, i.e. 0.17-0.30 microg/kg bw/d, which represents 17%-30% of the PTWI (provisional tolerable weekly intake). The contribution from drinking water to the oral exposure is low; on average 0.5 microg/d. Potential exposure to airborne Cd was estimated at about 0.02 microg/d. The additional Cd intake from urban soil ingestion probable in small children was found to be insignificant based on Cd concentrations in the soil of kindergarten playgrounds. Biomonitoring outputs characterize the recent and life-long cadmium burden of the Czech population from general environment In 1994-2003, the median blood Cd levels ranged in the interval 0.9-0.4 microg/l blood, in smokers being more than double that in non-smokers. Blood Cd levels detected indicate slightly decreasing trend as well as urine Cd levels (range of median values 0.44-0.28 microg/g creatinine). Since 1996 the levels in children have been found in more than 50% cases below the detection limit of the methods used. The estimated total cadmium intake in the Czech urban population does not signalize any increased risk of health impairment considering non-carcinogenic effects.

Copper saturation pathways of the urban population in the Czech Republic.

The estimation of the copper saturation pathways of the Czech urban population is presented. The data on copper concentrations proceed from the System of monitoring the environmental impact on population health in the Czech Republic in the period 1994-1998. The copper concentrations were monitored in foodstuffs from the commercial network, in drinking water at the outlets of the waterworks and in the public water main networks, and in the ambient air. The copper levels were measured also in biological material to obtain the data on the copper saturation of the population under monitoring. The copper intake from foodstuffs and drinking water did not vary significantly either in the particular years of monitoring or individual cities. The same concerns also the copper levels in biological material. The total copper intake for an average adult was estimated to be 20.2 micrograms/kg b.w./d., i.e. 1300 micrograms/d. Over 99% of the total intake was that from the diet. The exposure from the intake of drinking water as well as from ambient air was low. The total daily intake lies in the interval 1000-2000 micrograms/d which is usually found in the similar studies of the copper intake. It represents only 40% of the daily dietary copper intake recommended by the JECFA FAO/WHO Commission, 1982. The copper levels in biological material did not differ from the reference values, and did not indicate any evincible hyposaturation of the population with copper.