简介:2.1 Total solubilized fluoride is determined potentiometrically using a fluoride ion-selective
electrode (ISE) in conjunction with a standard single-junction reference electrode, or a fluoride
combination ISE, and a pH简介:2.1 Total solubilized fluoride is determined potentiometrically using a fluoride ion-selective
electrode (ISE) in conjunction with a standard single-junction reference electrode, or a fluoride
combination ISE, and a pH meter with an expanded millivolt scale or an ISE meter capable of being
calibrated directly in terms of fluoride concentration.
2.2 Standards and samples are mixed 1:1 with a total ionic strength adjustment buffer
(TISAB). TISAB adjusts ionic strength, buffers pH to 5-5.5, and contains a chelating agent to break
up metal-fluoride complexes. Calibration is performed by analyzing a series of standards and
plotting mV vs. fluoride concentration on semilog paper or by calibrating the ion meter directly in
terms of fluoride concentration.详细>