Water Science & Technology: Water Supply Vol 1 No 2 pp 19–26 © IWA Publishing 2001
Determination of cadmium and lead in water - new recommended way of
evaluating the limits of detection and quantification
J Mocak* and A Bobrowski**
*
Department of Analytical Chemistry, Slovak University of Technology,
Radlinskeho 9, SK-81237 Bratislava, Slovakia.
(E-mail: mocak@cvt.stuba.sk)
**
Faculty of Material Engineering and Ceramics,
University of Mining and Metallurgy, Al. Mickiewicza 30, 30-059 Krakow,
Poland. (E-mail: gcbobrow@@cyf-kr.edu.pl)
ABSTRACT
Traditional and the new IUPAC recommended calculation methods for
determining the limit of detection and the limit of quantification are
applied to the trace determination of cadmium and lead in water. The new
method is based on the upper limit approach (ULA), which utilises the
one-sided confidence band around the calibration line. The residual
standard deviation of the calculated calibration line as well as the
t-distribution critical value are used for the calculation of both
limits. An appropriate design of the calibration experiment is
described. The calculation of both limits in the new way is extremely
easy when the calibration experiment is equidistantly designed.
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