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4210F12For determination of fluoride ion activity in concentrations from saturated to 10-6M (0.02 ppm)Method approved by ASTM for water, drinking water, wastewater and seawater brines and it is approved by EPA, Standard Methods and AOAC for feedsRange saturated to 0.02 ppmRequires 4215F10 reference electrode. Uses 4215F20 fill solutionAccessories:Fluoride standard, 0.1000 M ±0.0005Fluoride standard, 100 ppm ±0.5 ppm1 or 2 ppm Fluoride standard with TISAB buffer, for use without dilutionTISAB III Buffer ConcentrateFor total ionic strength adjustment in fluoride analysis of drinking waterContains CDTA to release fluoride complexed by iron or aluminumMust be diluted 10:1 before use. Diluted buffer is then mixed 1:1 with standards and samples for adjustment of pH and increased ionic strength to compensate for differences among samples.TISAB II BufferSimilar to 4210F37, but not concentratedStandards and samples are diluted 1:1 directly with the buffer
