Objectives To compare the similarities and differences of determination of fluoride in water using ion selective electrode method, ion chromatography and alizarin complexone spectrophotometry.
Methods The three methods were compared and analyzed in the application range, determination efficiency, sampling amount, linear range, detection limit, determination limit, accuracy, precision and the recovery of standard addition.
Results The linear range, detection limit, determination limit, RSD and recovery of standard addition of ion selective electrode method were (0.06-3)mg/L, 0.02 mg/L, 0.1 mg/L, 0.20%-0.50%, and 96.4%-103%, respectively; those of ion chromatography method were (0.002-5)mg/L, 0.000 5 mg/L, 0.002 mg/L, 0.840%-1.40%, and 94.2%-99.6%, respectively; and those of alizarin complexone spectrophotometry were (0.1-2)mg/L, 0.03 mg/L, 0.1 mg/L, 1.72%-1.76%, and 84.7%-99.2%, respectively.
Conclusions The ion selective electrode method has good accuracy and precision in the linear range, and is an economical and classic fluoride detection method. The alizarin complexone spectrophotometry is suitable for popularization in the primary laboratory. Satisfactory results could be obtained from the determination of low concentration samples, however the accuracy and recovery of higher concentration samples was not ideal. The ion chromatography has a wide range of applications, and the high concentration fluoride has particularly obvious detection advantages, which has become the primary detection method in some laboratories.
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