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readmg to the fluonde IOn concentratIOn of the unknown usmg the standard curve If a selective Ion meter IS used, read the fluonde level m the unknown sample directly m mg/1 on the fluonde scale NOTE: For mdustnal waste samples, this amount of buffer may not be adequate AnalystshouldcheckpHfitst IfhIghlybasIc(>'9),add1NHCltoadjustpHto83 9 PrecIsIon and Accuracy - " 91 A synthetIc sample prepared by'the Analytical Reference ServIce, PHS, contammg 085 mg/1 fluonde and no mterferences was analyzed by 111 analysts, a mean of 0 84 mg/1 wIth a standard deViatIOn of ±O 03 was obtamed 92 On the same study, a synthetIc sample contammg 075 mg/1 fluonde, 25 mg/1 polyphosphate and 300 mg/1 alkalImty, was analyzed by the same 111 analysts, a mean of0 75 mg/1 fluonde wIth a standard devIatIOn of ±O 036 was obtamed BIblIography 1 PatentNo 3,431,182 (March 4, 1969) 2 CDT A is the abbreViated deSignation of 1,2-cyc1ohexylenePDF Image | Methods for Chemical Analysis of Water and Wastes
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