en Environmental Health, Sciences, and Engineering Environmental Health, Sciences, and Engineering پژوهشي Original Article <p><span style="font-size:14px;"><span style="font-family: times new roman;"><strong>Background;</strong> Fluoride is an essential nutrient for the human body. The major routes of fluoride intake include food and drinking water, though the absorption of fluoride from food is much easier. The aim of this study was to evaluate the amount of fluoride in the soil and tomato and onion crops on farms of Zanjan.</span></span></p> <p><span style="font-size:14px;"><span style="font-family: times new roman;"><strong>Methods; </strong>Three farms of each crop (tomato and onion) were selected randomly. Each farm was divided into 10 sections, and one sample of soil and crop of each section was taken which means 120 samples in total. Fluoride concentrations in the soil and crops were measured using the Ion Selective Electrode (ISE) and repeated 3 times.</span></span></p> <p><span style="font-size:14px;"><span style="font-family: times new roman;"><strong>Results; </strong>The mean concentration of fluoride in soil samples from studied farms in Zanjan was 0.83 &plusmn; 0.17 mg/kg. The mean concentrations of fluoride in tomatoes and onions of Zanjan were observed 2.10 &plusmn; 0.80 and 2.23 &plusmn; 0.64 mg/kg, respectively.</span></span></p> <p><span style="font-size:14px;"><span style="font-family: times new roman;"><strong>Conclusion;</strong>There was no significant difference between fluoride concentration in tomatoes and onions, although there was a significant difference between the amount of fluoride in the soils of studied farms (<em>Pv</em> < 0.024). No significant correlation was observed between the fluoride levels of soils and the fluoride levels of tomatoes (R² = 0.126) and onions (R² = 0.008).</span></span></p> <p></p><p></p> Fluoride, Tomatoes, Onions, Soil, Zanjan 47 51 http://jhehp.zums.ac.ir/browse.php?a_code=A-10-84-1&slc_lang=en&sid=1 Khalilollah Moeinian Khalilollah moeinian@yahoo.com 10031947532846009386 10031947532846009386 No Department of Environmental Health Environmental Health Engineering, School of Public Health, Semnan University of Medical Sciences, Semnan, Iran. Mohammad Reza Mehrasbi mehrasbi@yahoo.com 10031947532846009387 10031947532846009387 No Department of Environmental Health Engineering, School of Public Health, Zanjan University of Medical Sciences, Zanjan ,Iran. Hassan Hassanzadazar h.hassanzadazar@yahoo.com 10031947532846009388 10031947532846009388 Yes Department of Food Safety and Hygiene, School of Public Health, Zanjan University of Medical Sciences, Zanjan, Iran Koorosh Kamali drkamali@zum.ac.ir 10031947532846009389 10031947532846009389 No Department of Public Health, School of Public Health, Zanjan University of Medical Sciences, Zanjan, Iran. Elaheh Rabiei elahe.rabeiee@yahoo.com 10031947532846009390 10031947532846009390 No Department of Public Health Food Safety Health, Zanjan University of Medical Sciences, Iran.