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[求助]
ICP OES 英文问题 求大神解答 急急急急急
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In the table is presented a variance analysis for the determination of total concentration of four metals in sewage sludge. The data includes relative variances in sampling, pre-treatment by microwave assisted acid digestion by aqua regia, analysis by ICP-OES as well as measurement bias. From this a total relative uncertainty (u) was calculated. Quantification was done by external calibration. Observe that the relative variances are given in the table, meaning that the original standard deviation value for each parameter (sampling, treatment and analysis) has been divided with the Mean values given in the table. The bias has been estimated from the results for a soil certified reference material in the following way; Bias2 = ((measured value - certified value)/certified value))2. In the table also the % of the total relative uncertainty is given for each of the four contributing uncertainty sources. 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? (2.5p) c. For the determination of trace metals/metalloids in soils by ICPMS on this course, you used a marine sediment certified reference material (MESS-3) as a quality assurance measure. In general, the agreement between measured and certified analyte concentrations was rather poor. From your available experimental data it is complex to explain the exact reasons for these results. Suggest specific experiments that could be done to try to find out the possible reasons for the differences between measured and certified concentrations. (5p)  table.jpg |
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