Precision and accuracy were determined as relative standard
deviation (RSD) and relative error (RE), respectively, by analyzing
the same reference standard solution five times for various
concentration levels. Table 2 shows RSD and RE for five
concentration levels of each element. The detection limits DL
of the investigated metals, defined as the metal concentration
yielding an analytical peak equal to the minimum detectable
one, can be calculated as.(Smith and Osteryoung, 1978)
DL= 5(Sd/m) Where Sd is the standard deviation of the blank
and m is the slope of the calibration line. Table 2 shows the calculated
detection limits of all elements under study. The given
detection limits of the elements under investigation revealed
that the proposed scheme of analysis under the optimal conditions
is very sensitive and very useful for ultra trace determination
of elements.
The detection and quantification limits have been established
as the concentration expressed in nanograms of the element
per gram of sample, giving a current reading statistically
different from that of the blank, and they have been calculated
by dividing 5 and 10 times the standard deviation of the current
readings of the blank by the slope of the analytical curve,
respectively. From these values, and taking into account the
dilution and sample size, the detection and quantification limit
in nanograms per gram of sample have been calculated. The
values obtained are shown in Table 2. Precision of the method
has been estimated from the standard deviation and the correlation
coefficient for five replicate analyses of sample solutions,
and it provides values greater than 0.006 and 0.99 for all metals,
respectively.
Precision and accuracy were determined as relative standarddeviation (RSD) and relative error (RE), respectively, by analyzingthe same reference standard solution five times for variousconcentration levels. Table 2 shows RSD and RE for fiveconcentration levels of each element. The detection limits DLof the investigated metals, defined as the metal concentrationyielding an analytical peak equal to the minimum detectableone, can be calculated as.(Smith and Osteryoung, 1978)DL= 5(Sd/m) Where Sd is the standard deviation of the blankand m is the slope of the calibration line. Table 2 shows the calculateddetection limits of all elements under study. The givendetection limits of the elements under investigation revealedthat the proposed scheme of analysis under the optimal conditionsis very sensitive and very useful for ultra trace determinationof elements.The detection and quantification limits have been establishedas the concentration expressed in nanograms of the elementper gram of sample, giving a current reading statisticallydifferent from that of the blank, and they have been calculatedby dividing 5 and 10 times the standard deviation of the currentreadings of the blank by the slope of the analytical curve,respectively. From these values, and taking into account thedilution and sample size, the detection and quantification limitin nanograms per gram of sample have been calculated. Thevalues obtained are shown in Table 2. Precision of the methodhas been estimated from the standard deviation and the correlationcoefficient for five replicate analyses of sample solutions,and it provides values greater than 0.006 and 0.99 for all metals,respectively.
การแปล กรุณารอสักครู่..
