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HEALTH RISK ASSESSMENT OF STABLE STRONTIUM AND FLUORIDE CONTENT IN PIPE WATER

Congress: 2008
Author(s): Boris Synzynys, Irina Polyakova
State University for Nuclear Power Engineering, Obninsk, Kaluga region, Russia irinaamchenkina@mail.ru
AbstractBackground. Increased content of stable strontium in pipe water is typical of the central and east Russia settlements and other regions of the globe. With the hygienic standard 7 mg/l of strontium in drinking water its content in some water sources amounts to 20 mg/l. Strontium is quickly accumulated in children organisms till the age of 4; high levels of cardiovascular diseases are recorded for strontium enterprise workers. Strontium rachitis may arise even in case of a full diet and is not treated with vitamin D as strontium affects metabolism of vitamin D itself. Groundwater used for drinking also involves great amounts of other elements, for example fluorine. Under real conditions these elements have a combined impact on human organism, causing effects of antagonism (weakening))or synergism (enhancement). Aim. Studies of the complex impact of stable strontium and fluoride at a cell level and assessment of a human health danger index(DI). Methods. Cytogenetic effect of Sr and F was determined in Allium test (according to WHO recommendations) and from variations in the cellular indices of mice bladder cells. A model is developed to assess a combined risk in case of antogonistic Sr and F impact. The model is based on quantitative data on Sr and F accumulation in human bone tissue (Knizhnikov,1967). Results. Model experiments with Allium test have shown that at 7 mg/l strontium content in water a fraction increases of cells with cell division disturbances. Strontium impact on the chromosome apparatus of bladder cells of mice using water with the increased strontium content is demonstrated. Fluoride available in water notably reduces the hazardous strontium effect : the antagonism coefficient is 0.07. Experimental data and hygienic observations allowed a health risk assessment model to be developed for pipe water with Sr and F. Health risk was assessed from a danger index. The highest non-carcinogenic health risk in the earliest manifestations will be observed when drinking tea and pipe water (DI = 1.83). Such risk is inadmissible for people.With allowance for the antogonistic effect of fluoride the danger index is reduced to 0.85 and becomes admissible. Conclusion. If Sr concentration in water exceeds 7 mg/l, the basal ration is to be added with products or food agents containing 1 mg fluoride per kg of food or litre of pipe water.
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