回复bertin发表于：2020/8/2 19:42:31悬赏金额：
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Relative uncertainty (Variance/Mean value)
Mean values Sampling2 Pre-treatment2 Analysis2 Bias2 Total Total Total
(mg/kg) relative u2 relative u relative u %
Cr 33 0.03244 0.00082 0.00008 0.04812 0.08146 0.28541 29
Cu 130 0.00213 0.00013 0.00037 0.00342 0.00606 0.07783 7.8
Pb 22 0.02694 0.00162 0.00008 0.02477 0.05340 0.23109 23
Zn 525 0.00167 0.00015 0.00027 0.02793 0.03002 0.17326 17
% of total relative uncertainty
Sampling Pre-treatment Analysis Bias
Cr 40 1.0 0.10 59
Cu 35 2.1 6.2 57
Pb 50 3.0 0.16 46
Zn 5.6 0.5 0.9 93
a. How do you interpret these results?
(2.5p)
b. Considering the results above and the method used in this study, what would
you suggest to do to improve the total uncertainty in the analysis
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