INORGANIC ANIONS WITH POTENTIAL STRUMIGEN IC EFFECTS IN POTABLE WATERFOR HUMANS AND ANIMALS

The levels of inorganic anions (NO3-, NO2-, Cl-, SO42-, F- and HPO42-) with the following average values (mg/l) were determined isotachophor etically in 82 samples of potable water for humans and animals: 39.7 /- 53.1 for nitrates, min. 0.0 - max. 363.3; 0.206 +/- 0.954 for nitri tes, min. 0.0 - max. 7.82; 37.5 +/- 32.4 for chlorides, min. 0.0 - max . 137.9; 74.2 +/- 74.1 for sulfates, min. 4.2 - max. 369.2; 0.208 +/- 0.138 for fluorides, min. 0.032 - max 0.605 and 0.350 +/- 1.917 for ph osphates, min. 0.0 - max. 17.4 (Tabs. I-IV). Within the set of samples examined, 22.0 of samples exceeded the limit value for nitrates; the respective values for nitrites, chlorides, sulfates and phosphates wer e 13.4, 6.1, 2.4 and 1.2. None of the samples exceeded the limit value for fluorides. 34.1% of samples complied with the value recommended b y the standard for nitrates. Nitrate concentrations in drinking water for cows were compared with urine iodine content in some cows in the t otal of 398 urine samples from 14 localities. Tab. VII shows the avera ge values of both indicators. With increasing nitrate concentrations i n water the higher iodine content in urine was recorded at some locali ties. Correlation analysis proved this relationship to be statisticall y highly significant (P < 0.01), Tab. VIII. The values of nitrate and iodine contents at DYJ locality are expressly different (Tab. VII).