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„1 + 1 = 1 or The benefits of Known Addition”
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The new generation of measurement equipment by SEIBOLD-Messtechnik
supports the method of
"Known Addition" for various applications, allowing for measurement
results of highest accuracy
in complex matrices to be guaranteed.
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Existence of interfering ions in a sample to be measured is referred to as
complex matrix. Complex matrices cause conditions difficult to cope,
specifically with measuring various elements by the use of an ion selective
electrode.
Complex matrices tend to influence the sample to be measured and thus limit
the accuracy of measurement achievable. SEIBOLD-Messtechnik, specialised in
continuous online measurement of various waters and liquids, now uzilises the
method of Known Addition
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successfully, to cope this problem.
One of the possible applications for instance is measurement of the
concentration of cyanide (CN-) in industrial wastewaters. Cyanide in general
is a difficult to measure element due to its sensibility in case of existence
of interfering ions. Another application is measurement of manganese (Mn) with
various wet-chemical methods, where the lowest measurement range of 0.05 to
2 mg/l has to be provided constantly with the highest accuracy possible.
The method of Known Addition allows for calculating the actual measurement
result based on the values derived form defined series of measurements. In a
first step the sample is measured as provided directly out of the process. Then,
the sample is added a solution with known concentration and further measurements
are carried out. The actual concentration can finally be calculated at highest
precision form the results of both measurements performed so far.
The (standard) solution to be used for measurement of the concentration does
not require any specific preperation and can be used with SEIBOLD-Analysers as
shipped. Additionally, contact of personnel operating the analysers with the
liquid sample to be measured is reduced to a minimum.
It has been verified in comprehensive test series, that automated calibration
is an expedient extension to the use of Known Addition. Automated calibrations
allows for taking various effects into consideration when calculating the
actual measurement result, for example the extent of ageing of the ion
selective electrode used.
Combining the method of Known Addition and automated calibration, as provided
with the new generation of SEIBOLD Online-Analysers, ensures measurement
results of highest accuracy and repeatability. What in the past was only
possible with the extensiv support of laboratories, can now be achieved by the
use of the new generation of measurement equipment offered by SEIBOLD-Messtechnik.
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SEIBOLD-Messtechnik und Projektentwicklug GmbH, A-1110 Wien, Grillgasse 51
Tel +43 1 332 00 60, Fax +43 1 332 00 60 44,
office@seiboldme.com
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