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Project presentation

Project presentation. Geo-Center project, financed by GEUS and AU 2011- 2014 Project title: “Iodine in the hydrological cycle in Denmark: implications for human health“ People involved in the project: Søren Munch Kristiansen (AU, Department of Geoscience)

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Project presentation

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  1. Project presentation • Geo-Center project, financed by GEUS and AU • 2011- 2014 • Project title: “Iodine in the hydrological cycle in Denmark: implications for human health“ • People involved in the project: • Søren Munch Kristiansen (AU, Department of Geoscience) • Birgitte Hansen, Vibeke Ernstsen, Brian Sørensen & Kim Esbensen (GEUS)

  2. Why iodine is interesting? Medical aspect • essential component of the thyroid hormones • low iodine intake: • variety of IDD – mental retardation, goitre, hypothyroidism, etc; • prevention – fortification of table salt and salt in bread(dk mandatory since 2000/2001) • high iodine intake: • tolerable upper intake level • associated with the correction of iodine deficiency or/and chronically high intake – iodine induced hyperthyroidism, elevated goitre and subclinical hypothyroidism Geochemical aspect • iodine in groundwater (= tap water) • mapping regional/temporal variations • not included in the monitoring programs of the waterworks; • data mainly from GRUMO wells; some studies • understanding the involved processes • source/sources of iodine in the groundwater in Denmark

  3. Andersen, Petersen, Lauberg “ Iodine in drinking water is bound in humic substances“ 2002 Previous studies Rasmussen, Larsen, Ovesen “Iodine content in drinking water and other beverages in Denmark” 2000 Pedersen, Laurberg, Nøhr, Jørgensen, Andersen "Iodine in drinking water varies by more than 100-fold in Denmark. Importance for iodine content of infant formulas" 1999

  4. Available Groundwater data Status December 2011: 2562 samples • Data quality assessment • Different methods • Unit mistakes • Statistical analysis of the data • Picking up interesting areas for case-studies Number of Iodine* samples Poster Bari

  5. Multivariate Data analysis Purpose: finding outliers grouping due to date, method, etc. exploring the relations/correlations between the different data I Other constituents Hypothesis: there is correlation between iodine and the other constituents or some of them • Hypotheses: • Iodine originates from the rock/sediment • sea water intrusion • upward diffusion of old saltwater Geology Distance to coastline Distance to major faults I

  6. Storage experiment: How the Iodide concentration in groundwater sample is affected by: storage conditions – 5ºC,10ºC, freezer storage period Iodine speciation Important for the geochemical understanding of the Iodine cycle Inorganic iodine Organo-iodine Total iodine Statistically significant difference Lab methods development and testing: Inorganic Iodine – IC Total Iodine – ICP-MS Organo-iodine Freezer – indications that the composition of the water was different; new experiment needed in order to make conclusions

  7. Case Studies Ishøj Hjelmsølille Purpose: Source - explanation for the observed concentrations Iodine speciation Geochemical analysis 0 meq/l Na+K Cl 11 Ca HCO3 Mg SO4

  8. Future plans and possible collaboration Medical aspect Geochemical aspect In progress: • Case studies • Multivariate analysis of Jupiter data National study on Iodine in drinking water: • Sampling from waterworks wells • Reflecting the different geology and the size of the waterworks • Mapping of Iodine concentrations in drinking water • Estimation of the dietary iodine intake in Denmark • Combined study with data from medical registers Possible collaboration

  9. Thank you for the attention

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