Hach PLATINUM Series, Руководство пользователя

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56
Glossary,
continued
regardless of solution composition. The sensing half-cell
develops a potential proportional to solution composition.
Conditioning—The process of preparing an electrode for use by
soaking the electrode in a solution with a pH and ionic strength
similar to the sample. Conditioning allows the formation of the
hydrated layer, necessary for accurate measurements.
Decade—Any two standards with a concentration ratio of 10.
For example:
Dilution factor—A numerical value by which results must be
multiplied in order to obtain the actual value of the sample. For
example, if 1 mL of sample is diluted to 10 mL, then the result
obtained must be multiplied by 10 to obtain the value for the
sample before dilution.
Electrolyte—A solution made of dissolved ions that is used to
facilitate electrical conductance and ionic transport. The
composition is usually potassium chloride (KCl), sodium
chloride (NaCl), ammonium chloride (NH
4
Cl), or ammonium
sulfate ((NH
4
)
2
SO
4
).
Free-flowing reference junction—The point on the electrode
where reference gel is freely dispensed without obstruction by
frits or other materials.
Hydrated layer—A layer that forms at the glass/liquid
interface. Chemically similar to the sample being measured
(especially in samples of low ionic strength), the formation
characteristics of this layer depend upon the type of glass, the
age of the glass, the previous usage history of the glass, the
temperature and ionic strength of the aqueous solution, etc.
Inert—Does not react with other substances.
Concentration of the higher Standard
Concentration of the lower Standard
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