METTLER TOLEDO
 

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USP standards require the dissolved ion content (conductivity) to be measured. The measurement of the conductivity depends on several factors such as the dissolved ion content, the temperature and the dissolved gases (usually CO2) and therefore not specific to a single dissolved specimen. Specialists have finally come to an agreement on two specimens of low conductivity (Cl- and NH4 +) in order to determine thresholds (1.33 mM or 1.66 mM) as a function of temperature.

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