| 英文摘要 |
According to the purpose of the project entitled “The Improvement of Analytical Techniques for Trace Metals Determination in High Salt Contents Waters”, two analytical techniques, including direct GFAAS measurement and the coupling of on-line dual chelex 100 columns preconcentration with ICPMS detection, have been established in this work to allow the accurate determination of Cu, Zn, Mn, Pb, Cd and total Cr. The validity of the two proposed methods had been checked with three certified reference waters (CASS-4, SLEW-3 and BCR CRM 609) and the results were found to be in good agreement with the certified values. The detection limits of dual chelec 100 columns preconcentration with ICPMS based on a sample volume of 10 ml for Cu, Pb, Cd, Mn and Zn were 0.09 ppb, 0.12 ppb, 0.012 ppb, 0.21 ppb and 0.09 ppb, respectively. Moreover, the detection limits of GFAAS for Cu, Pb, Cd, Mn, Cr and Zn were 0.21 ppb, 0.12 ppb, 0.015 ppb, 0.39 ppb, 0.093 ppb and 0.051 ppb, respectively. Several main items of this project were achieved, which involved the evaluation of humic acid removal through means of microwave digestion method and XAD-2 column method, direct determination of trace metals in waters by GFAAS, on-line dual chelex 100 column preconcentration of trace metals from waters followed by determination by ICPMS, up to 37 papers related to Cr (VI) species was collected in the period of 2000-2004 during the literature search, and on-site analytical practice has been conducted in three laboratories. As discussed above, it is showed that the contents and requirements of the project have been completely accomplished.
|