臺灣博碩士論文加值系統

一般重金屬離子之分析, 大部份均以 AA、HPLC 做分離與鑑定之工作.而
以 GC 作重金屬分析與應用之報導則相當少. 本研究目的在於能夠建立一
套簡便、快速、可信度高的檢驗重金屬之方法.本研究以 Chelex-100 陽
離子交換樹脂作為重金屬之預濃縮, 以及除去一些干擾物 (如鹼金及鹼土
金屬) 之前處理, 再以 NaDDTC (Sodium di- ethyldithiocarbamate) 螯
合劑與重金屬熬合, 所得重金屬螯合物以氯仿 (Chloroform) 萃取, 再以
線上管柱 (On-Column) 注射法注入 GC 分析與鑑定.而鎘(Cd)、鈷(Co)、
銅(Cu)、汞(Hg)、錳(Mn)、鎳(Ni)、鉛(Pb)、鋅 (Zn)八種過渡金屬溶液
之 pH 值調整至 6.5 及流速調整在 0.8-1.0 ml/ min 之間, 通過
Chelex-100 樹脂管柱, 可得最佳之回收率.所得之最佳預分離及 GC 分析
條件, 作為分析大漢溪之標準, 以確定此方法之可行性及可靠性, 作為往
後以氣相層析法分析重金屬離子之參考.此外本研究成功地使用 GC/MS 分
析八種重金屬螯合物, 使重金屬之分析鑑定工作, 更多了一項有力之分析
工具.

Analysis of heavy-metal ions by using AA and HPLC was widely
done in the past decades but the use of GC in analyzing heavy-
metal ions was rarely heard of. Therefore, we decided on a
simple, time-saving and highly accurate method of using GC in
the analysis of several heavy-metals ions. We used Chelex-100
resin for pre-concentration of heavy-metals in the smaple. It
has a high chelating selectivity which makes it suitable for
separating traces of heavy metals from the other major alkali
and alkaline-earth metals. Standard heavy metals were spiked
into deionized water and the solution was then passed through
two minicolumns packed with Chelex-100. Columns each 2g of
resin in the ammonium from with a flow rate of 0.8-1.0 ml/min
were found to be the best condition for the preconcentration of
Cd、Co、Cu、Hg、Mn、Ni、Pb and Zn in the water whose pH value
had been adjusted to 6.50. The trace metals were then
concentrated after being chelated with sodium
diethyldithiocabamate and then extracted form the water by
chloroform. Finally, we applied the above method to the natural
water of Da-Han Stream and the quantitative results were
compared to that of AA. GC/MS was also used as a further
confirmation of identifi- cation. The use of GC in the analysis
of heavy-metal ions will be an interesting challenge for
further investigation.