نتایج جستجو برای: fluoride of water
تعداد نتایج: 21220042 فیلتر نتایج به سال:
Abstract Background and purpose Fluoride is one of the fundamental and required components in human body. The current study intends to survey the status of fluoride in drinking water supplies ( underground water source and drinking water) in Qaemshahr city from 2006 (march/21) to 2012(march/19) and comparison with universal standards, national and climatic conditions. Materials and methods This...
Introduction: The safety of drinking water is one of the critical indexes concerning to health and hygiene of a society. Monitoring and controlling qualitative indices of water is of great importance. Therefore, this study aimed to investigate the quality of bottled water and urban drinking water in Semnan city with regard to the concentration of pollutant ions of nitrite and nitrate as well as...
Background & Aims: Fluoride is an important mineral in the prevention of dental caries (decay). Most parts of received fluoride of human body are obtained by drinking. In this research, the relationship between fluoride sources of drinking water and DMFT index of West Azerbaijan’s Piranshahr and Poldasht guidance schools were studied. Materials & Methods: In a cross-sectional study using a...
run-out-table (rot) is located between last finishing stand and down coiler in a hot strip mill. as the hot steel strip passes from rot, water jets impact on it from top and bottom and strip temperature decreases approximately from 800-950 °c to 500-750°c. the temperature history that strip experience while passing through rot affects significantly the metallurgical and mechanical properties, s...
Background & Aims: Secondary caries is one of the most common problems in restorative dentistry. The release of flouride ions could substantially benefit the tooth enamel and neigboring dentin because flourid can combat caries. The purpose of this in vitro study was to evaluate the solubility rate and release of fluoride from tooth-colored restorative materials (Iono CID, Fuji II LC, FugiIX, Fu...
The aim of this research was the geochemical assessment of the groundwater quality and the evaluation of the distribution pattern of fluoride concentration in water resources of the region and their connection with the prevalence of dental fluorosis occurrence in the study area. To achieve to this goal six sediment and 22 water samples were taken and analyzed. Fluoride and phosphorous concentra...
some children of borazjan area have minute white flecks, yellow or brown spot areas scattered irregularly over the tooth surface, the causative factor was attributed to excess of fluoride in water. to verify this matter short chemical examination of water samples from endemic area was carried out. the results of water analysis by colorimetric method, using zirconium a1izarin reagent after disti...
Concentration of soluble fluoride in groundwater, soil, and some crops in Isfahan region was determined by Ion Selective Electrode (ISE) method. The mean fluoride concentration of water samples in the study area was 0.3 and 0.05 mg L-1 in the spring and summer, respectively. These values are in an acceptable limit for irrigation, whereas for drinking water, they are in deficiency range. The ave...
background and aims. the aim of the present study was to systematically review fluoride concentration of drinking waters and prevalence of fluorosis in iran through systematically evaluating results of studies conducted in this regard. materials and methods. in this systematic review study, the required data was collected using keywords including drinking water fluoride, fluoride concentration,...
in civil engineering concrete is a material combined of hydraulic cement, sand, gravel and water. gravel and sand compose 60 to 70 percent of concrete. these aggregates support compression force of concrete. cement paste acts as glue to stick grain together. in bushehr factories producing aggregates do not operate according to astm standards, so that fineness modulus (fm) of the produced sands ...
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