Monitoring of organohalogens body burdens of the Czech population M. Černá 1,2, R. Grabic 3, A. Batáriová 1,2, B. Beneš 1, J. Šmíd 2, V. Bencko 4 1 Nat.

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Presentation transcript:

Monitoring of organohalogens body burdens of the Czech population M. Černá 1,2, R. Grabic 3, A. Batáriová 1,2, B. Beneš 1, J. Šmíd 2, V. Bencko 4 1 Nat. Inst. Publ. Health, Prague 2 Charles Univ., 3 rd Fac.Med. Prague 3 Institute of Public Health, Ostrava 4 Charles Univ., 1 st Fac.Med. Prague

The Czech Republic belongs to the countries with a relatively high body burden of PCBs in the past, due to the production of commercial PCB mixtures in the Slovak part of former Czechoslovakia up to 1984 when the production was abolished. Chlorinated pesticides were used in the agriculture in 60ties – 70ties when they were abolished, but their residua in the food chain and the dietary exposure of the Czech population are still existing. PCDDs and PCDFs as unwanted by-products of industrial and thermal processes can be detected in the vicinity of chemical industrial plants or hazardous waste incinerators. Introduction

Exposure data are essential for health risk assessment and for the efficient regulation of these pollutants. Exposure data are essential for health risk assessment and for the efficient regulation of these pollutants. Human biomonitoring is the most appropriate approach to define body burden of lipophilic POPs. Human biomonitoring is the most appropriate approach to define body burden of lipophilic POPs. Concentrations of POPs are measured in human body fluids and tissues containing lipids; human milk, blood serum or adipose tissue are most often used matrices. Concentrations of POPs are measured in human body fluids and tissues containing lipids; human milk, blood serum or adipose tissue are most often used matrices. Systematic Biological Monitoring Programs have been conducted in several countries to determine the current levels and long-term time trends. Systematic Biological Monitoring Programs have been conducted in several countries to determine the current levels and long-term time trends. Introduction (cont.)

Biomonitoring projects realized in the Czech Republic within the last 15 years 1. CZ-HBM within the nationalwide Environmental Health Monitoring System operated in the Czech Republic since 1994 (human milk, subcutaneous fat, blood serum and others) 2. Participation in the 2 nd (1992), 3 rd (2000/01) and 4 th (2005) round of the international WHO-coordinated Exposure Study of PCBs, PCDDs, and PCDFs concentrations in human milk. 3. Cross-sectional study of the individual levels of PCDDs/PCDFs/PCBs in altogether 81 human milk samples collected in seven regions of the CR ( ). 5.Studies targeted at the residents living in the vicinity of a chemical plant or of a solid waste incinerator. 6.Retrospective study of the levels of PCBs and chlorinated pesticides in the pooled blood serum samples from Serum Biobank ( ) supported by Ministry of Health (IGA NR/9015-3).

CZ-HBM – monitored areas in the 1st and 2nd period

Concentrations of selected chlorinated pesticides in human body of the Czech population I.Human milk II.Blood serum A

Chlorinated pesticides in human milk (medians, ng/g fat)

Retrospective study – levels of HCB in the pooled serum samples from Ostrava y ng/g fat age (y) HCB 0-2 y 5-6 y y y 0-2 y 5-6 y y y 0-2 y 5-6 y y y

DDT Retrospective study – levels of DDT in the pooled serum samples from Ostrava ng/g fat age (y)DDT y 5-6 y y y 0-2 y 5-6 y y y 0-2 y 5-6 y y y

Levels of HCB and DDE in human blood serum (µg/kg fat) in 2005

Concentrations of polychlorinated biphenyles in human body of the Czech population I.Human milk II.Blood serum B

CZ-HBM: time-related median values of PCB congener 153 in human milk ng/g fat New locations

Levels of indicator PCB 153 in human milk fat: differences in reference values throughout the years differences in reference values throughout the years

Uherské Hradiště I PrahaUherské Hradiště II KolínLiberecKladnoTelčCZ-HBM rd WHO study 2000 ng/g fat Median levels of PCB 153 in human milk analyzed in cross- sectional study in comparison with the CZ-HBM and the 3 rd WHO-study data Ústí n. L.

Kladno 1992 Uh. Hradiště 1992 Kladno 2000 Uh. Hradiště 2000 Liberec 2000 Pooled sample ref. lab. SRN WHO NRL (median) median median 2 nd WHO study3 rd WHO study4 th WHO studyCZ-HBM ng/g fat WHO – coordinated studies: levels of PCB 153 in human milk

4 th international WHO coordinated study: levels of PCB 153 in pooled samples of human milk HungaryCyprusSudanNorwayLuxembourgSlovakiaCR ng/g tuku

Levels of PCB congener 153 in human blood serum (µg/kg fat) in 2005

Levels of PCB congener 153 in human blood serum of men and women and in human milk of mothers (age 20 – 40 years) in 2005

Retrospective study – levels of PCB 153 in the pooled serum samples from Ostrava ng/g fat age (y ) PCB y 5-6 y y y 0-2 y 5-6 y y y 0-2 y 5-6 y y y

Concentrations of PCDDs, PCDFs, and dioxin-like PCBs in human body of the Czech population C

WHO studies - TEQ levels of PCDDs/PCDFs in human milk of the Czech population Kladno 1992Uh.Hradiště1992Kladno 2000Uh.Hradiště2000Liberec 2000Pooled sample ref. lab. SRN 2 nd WHO study3 rd WHO study4 th WHO study TEQ pg/g fat

WHO -TEQ values obtained in WHO-coordinated studies in the Czech Republic Pooled sample 2005 – ref. lab. SRN

WHO -TEQ values obtained in the 4 th WHO- coordinated study – comparison with other countries

4th WHO-coordinated study levels of PCB 118 – comparison with other countries

Conclusions Sufficient data on the POPs body burden of the Czech population are available. Significant local differences, individual variability and increased levels of POPs with age are observed. Despite the significant declining trend (by around 50 %) of PCB in human milk over the 90-ties, Czech population is still at an increased exposure risk. Long-term declining trends are observed for HCB and DDT sum. Our results confirmed the existence of hot-spot locations within the country. The levels of PCDDs/PCDFs in human mílk of the Czech population are comparable with those in EU countries. Dioxin-like PCBs (mostly 126, 156) contribute more than 60% to WHO- TEQ value.

Future plans The data presented can be used for estimation of the Czech background exposure (as related to Stockholm convention). Reference values for POPs components will be assessed with respect to time period, population group and age. Long-term time trends in body burden will be followed-up. The health consequences of the temporary elevation of infant body burdens are uncertain. Further health-related studies in this field are to be recommended.

Thank you for your attention Acknowledgement: Partially funded by the Research grant IGA NR/ of the Czech Ministry of Health