YSI P 700 IQ Analyzer - Manual (Page 109)

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P 700 IQ
9. Appendix
9.1 Glossary
Absorbance Logarithmic measure for the absorption of the sample; negative
decadic logarithm of the transmission.
Adjusting To manipulate a measuring system so that the relevant value (e. g. the
displayed value) differs as little as possible from the correct value or a
value that is regarded as correct, or that the difference remains within
the tolerance.
Blank value The blank value is the measured value of a measuring system if the
measured parameter has the value zero or is nonexistent. The blank
value has to be determined and subtracted from the measured values
of the actual samples.
Calibration Comparing the value from a measuring system (e. g. the displayed
value) to the correct value or a value that is regarded as correct. Often,
this expression is also used when the measuring system is adjusted at
the same time. See «Adjusting».
Citation forms Different display formats that can be derived from each other of the
measured value for a concentration. The method for determining phos-
phate provides, for example, a measured value for phosphorous P.
This measured value can also be quoted in other citation forms such as
PO4, PO4-P or P2O5.
Concentration Mass or amount of a dissolved substance per volume, e. g. in g/L or
mol/L.
Deionized water Water that was freed of minerals with the aid of an ion exchanger.
Deionized water may still contain uncharged contamination such as
organic compounds. It is also called DI water.
Eutrophication The excessive pollution of water bodies with nutrients is called eutro-
phication or overfertilization. To fight against the eutrophication of a
water body, the phosphate load has to be reduced first of all. When the
phosphate supply is limited, the nitrate contents cannot be consumed
by plants even if they are available in huge quantities.