Rechnergesteuerte multiple Standard-Zumisch-Methode beim Arbeiten mit ionensensitiven Elektroden

Ebel, S.; Becht, U.

doi:10.1007/bf00488671

Cited by 6 publications

(5 citation statements)

References 10 publications

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“…The values of unknown fluoride concentration can be obtained by Gran's plot, in which the practical values of ion-selective electrode slopes must be known prior or by computer-controlled, especially for the multiple standard-addition. When all points of the Gran's plot lie on the straight line, the intercept on the abscissa yields the concentration of the unknown sample 16 (see figure 1).…”

Section: Discussionmentioning

confidence: 99%

“…The potential values were transmitted every second to a work station. 16 The mean value over a 10s period was calculated and displayed in monitor. The difference between the two mean potential values over a period of 10 s was successively monitored.…”

Section: Methodsmentioning

confidence: 99%

“…The fluoride concentration of the sample was then calculated by Gran's plot. [16][17][18] By this computer-controlled instrument the standard addition was done in such a way that equidistant intervals of the potential steps to be measured were achieved. The analysis was performed automatically using a computer-controlled potentiometry equipped with WsA software (self developed by Department of Pharmacy, University of Würzburg, Germany).…”

Section: Methodsmentioning

confidence: 99%

“…14,15 To overcome this problem, a standard-addition method should give good accuracy and precision. 16 Therefore, the purpose of this work was to develop an accurate method for the determination of fluoride in infusions of black, green and herbal teas by ion-selective electrode using a computercontrolled standard-addition technique.…”

Section: Introductionmentioning

confidence: 99%

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Determination of fluoride in black, green and herbal teas by ionselective electrode using a standard-addition method

Yuwono

2005

Dent. J. (Majalah Kedokteran Gigi)

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Tea leaves are very rich in fluoride, since tea plants take up fluoride from the soil and accumulate in its leaves. Some of this fluoride is released into the infusion, which is drunk as tea. Fluoride in tea could be beneficial for the prevention of dental caries, but it may result in excessive intake and lead to enamel fluorosis. The purpose of this work was to determine the fluoride levels in 12 different brands and types of tea by means of a computer-controlled ion-selective electrode potentiometry using a standard-addition method. It is a rapid method which showed good accuracy and precision. Fluoride contents of tea infusions after 5 min ranged from 0.95 to 4.73 mg/l for black teas; from 0.70 to 1.00 mg/l for green teas, and from 0.26 to 0.27 mg/l for herbal teas. It was concluded that black teas and green teas examined may be important contributors to the total daily fluoride intake. However, the ingestion of some black teas that were found to have high fluoride content by children at the age of risk to dental fluorosis should be avoided.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Determination of fluoride in black, green and herbal teas by ionselective electrode using a standard-addition method

Yuwono

2005

Dent. J. (Majalah Kedokteran Gigi)

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“…When the additions do not scale linearly, i.e. the detector is non-linear, calculated effective absorptivities (CA44), controlled computer additions in such a way that equidistant intervals of response are obtained (CA7), and non-linear modeling (CA10, CA25, CA30) are possible solutions for the problem. Flow injection analysis (FIA) is probably the best way to implement standard addition methods for solutions (CA16).…”

Section: Calibrationmentioning

confidence: 99%