碩士 / 國立清華大學 / 原子科學研究所 / 81 / A two-step preconcentration procedure is proposed to be used
in conjuction with differential pulse anodic stripping
voltammetry for the determination of tracer metals in
seawater. The two-step preconcentration involves extraction of
trace metals from seawater with L,L-ethyl- enedicysteine
diethylester (ECD) into chloroform followed by
backextraction with a Hg(Ⅱ) solution. The extraction could
concentration the trace metals by forming a chelate with ECD
with a high enrichment factor obtained with the large phase
volume ratio. The aqueous solution containing simply the
enriched metals and some of the nonreacted Hg (Ⅱ) was taken
for differential pulse anodic stripping voltammetry (DPASV)
using a glassy carbon electrode.Anodic stripping voltammetry
of the metals such as Zn,Cd,Pb and Cu were done directly in the
backextraction solution, i.e. , Hg(Ⅱ). It should be
worthwhile to note that the Hg(Ⅱ) solution used as the
backextraction agent does not cause any interference in the
anodic stripping voltammetry. Be- sides,the Hg(Ⅱ) can be used
in situ as the source of mer- cury film to be coated on the
glassy carbon electrode,ren- dering it as effective working
electrode for DPASV.
| Identifer | oai:union.ndltd.org:TW/081NTHU0257022 |
| Date | January 1993 |
| Creators | Chen, Wan-Ling, 陳婉玲 |
| Contributors | Lo, Jem-Mau, 羅建苗 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 70 |
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