نتایج جستجو برای: fluoride determination
تعداد نتایج: 270667 فیلتر نتایج به سال:
Pharmaceutical preparations containing sodium fluoride as an active substance have been examined. To do it, a procedure developed previously that uses the inhibition of redox reaction in the system under investigation was employed. For determination purposes, visible range spectrophotometry and redoxometric titration enabling indirect quantitative determination of fluoride ions in preparations ...
Low cost and in situ fluoride detection by non-experts is important for the determination of drinking water safety in developing countries. Colour reagents can provide results quickly without expensive equipment, but colorimetric fluoride indicators are often nonspecific, complex to use or do not work in water. Here we show that azulene-boronate indicators respond selectively to fluoride at con...
The range of fluoride levels in the drinking-water of cities and villages in South Africa was determined during the transition from a very dry (1983) to a wet (1984/85) period. The combination fluoride ion selective electrode was employed for the determination of the fluoride concentration. It was found that fluoride levels in drinking-water changed for 93% of the cities and villages studied du...
The purpose of this survey was the determine of effectiveness of preventive precisures. 320 twelve years school student have chosen randomly. After determination of DMFT All of them divided to 4 groups. First group as control and the other groups were as oral hygiene education 6-fluoride therapy and sealant therapy group in a period of two years.Results of this study showed that fluoride therap...
objective: the objective of this study was to investigate the invitro fluoride release of four new self-adhesive resin cements; set (sdi, australia), breeze (pentron, usa), embrace wetbond (pulpdent, usa), g-cem (gc, japan) and to assess the bonding performance of these self-adhesive resin cements for bonding of orthodontic brackets. materials and methods: for fluoride release experiment, six ...
of human plasma fluoride concentration. rg6o.-There is a constancy of plasma fluoride content of individuals who use communal water within the range O. 15-2.5 ppm fluoride. With an intake of 5.4 ppm of fluoride in the communal water there is a slight but significant elevation of the plasma concentration. There is no evidence of a marked or prolonged rise of plasma fluoride content following the...
Received: 25 Aug, 2015 Accepted: 26 Oct , 2015 Abstract Background & Aims: Access to safe drinking water is important in health and development at national, regional and local levels. The concentration of fluoride in drinking water is highly variable, depending on the individual geological environment from which the water is obtained. Fluoride is an essential microelement for human health...
0 Fluoride contamination occurs in a wide range of industrial effluents-wastewater from aluminum and steel production, metal finishing and electroplating, glass and semiconductor manufacturing, ore-beneficiation, and fertilizer operations. Concentration limits for fluoride of 1.0 to 1.5 mg/L have been established from time to time for surface waters, based upon two premises: (1) that these wate...
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