Appendix
Alyza IQ PO4
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Appendix
9.1
Glossary
Different display formats that can be derived from each other of the mea-
sured value for a concentration. The method for determining phosphate
provides, for example, a measured value for phosphorous P. This mea-
sured value can also be quoted in other citation forms such as PO4, PO4-
P or P2O5.
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 val-
ue that is regarded as correct, or that the difference remains within the tol-
erance.
Blank value
The blank value is the measured value of a measuring system if the mea-
sured 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 ex-
pression is also used when the measuring system is adjusted at the same
time. See «Adjusting».
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. Deion-
ized water may still contain uncharged contamination such as organic
compounds. It is also called DI water.
Firmware
The software permanently assigned to an instrument.
Ground fault circuit
interrupter
Earth leakage circuit breaker. An electrical assembly group that switches
off a circuit as soon as the strength of current in the phases does not ex-
actly agree with the strength of current in the neutral conductor. The cur-
rent difference can be caused by a grounded person inadvertently
touching a live part of the circuit.
LED
Light emitting diode
Measured
parameter
The measured parameter is the physical dimension determined by mea-
suring, e. g. pH, conductivity or D.O. concentration.
Measured value
The special value to be determined of a measured parameter. It is given
as a combination of the numerical value and unit (e. g. 3 m; 0.5 s; 5.2 A;
373.15 K).
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