Problems

28.1 Describe three situations in water works practice which would require fluoride determinations,

28.2 (a) What problems result with excessive fluoride concentration in water supplies? 0b) What problem can result when fluoride is .absent?

28.3 What analytical methods are available for fluoride analysis?

28.4 How can excessive fluoride be removed from drinking water supplies?

28.5 What is the purpose of sample acidification prior to distillation to separate fluoride from interfering ions?

28.6 What precautions must be exercised in determining fluoride by the electrode method and by ion chromatography?

28.7 In what way does the color formation in the colorimetric procedures for fluoride differ from that with most other colorimetric analyses?

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