Method Abstract #48, Fluoride by Standard Addition

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Fluoride by Standard Addition

Method Abstract #48

Scope and Application

This method determines the concentration of fluoride ions in a sample and helps overcome sample matrix difficulties.

Method Summary

The concentration of fluoride is determined by a fluoride ion selective electrode (ISE).  An initial reading is taken, following which a known amount of a higher concentration standard is added to the sample, via buret.  A second measurement is then taken and based on the millivolt (mV) difference the concentration of the initial sample can be calculated.  Both the standards and the samples are pre-treated with TISAB (Total Ionic Strength Adjuster) to ensure that the background response from each sample is similar.

Sample Calibration Curve

Method Performance

*Data for this measuring range was obtained using laboratory prepared standards formulated from sodium fluoride. The measuring range may be increased by using auto-dilution.

**The Method Detection Limit (MDL) was determined based on data obtaining a coefficient of variance better than 30%. Results may differ depending on laboratory practices and sample matrix.

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