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2.1 Total solubilized chloride is determined potentiometrically using a chloride ionselective electrode (ISE) in conjunction with a double-junction reference electrode, or a chloride combination ISE, and a pH meter with an expanded millivolt scale or an ISE meter capable of being calibrated directly in terms of chloride concentration. 2.2 Standards and samples are mixed 50:1 with an ionic strength adjustment solution (ISA). Calibration is performed by analyzing a series of standards and plotting mV vs. chloride concentration on semilog paper or by calibrating the ion meter directly in terms of chloride concentration.
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