Separation and determination of traces of heavy metals complexed with humic substances in fresh waters by sorption on diethylaminoethyl-sephadex a-25 |
| |
Authors: | Masataka Hiraide Sujith Prasan Tillekeratne Koji Otsuka Atsushi Mizuike |
| |
Institution: | Faculty of Engineering, Nagoya University, Chikusa-ku, Nagoya 464 Japan |
| |
Abstract: | Copper(II), lead and cadmium complexed with humic and fulvic acids in filtered 1-l samples of fresh water are sorbed on a column containing 0.5 ml of the macroreticular weak-base anion exchanger, diethylaminoethyl-Sephadex A-25 at a flow rate of 20 ml min?1. Simple metal cations are not sorbed at all. The sorbed trace metals are quantitatively desorbed with 4 M nitric acid batchwise and determined by graphite-furnace atomic absorption spectrometry. For synthetic aqueous solutions containing traces of heavy metals and humic acid, the results are in conformity with those obtained by cationexchange separation. About 80% of the sorbed humic substances are eluted with 0.5 M sodium hydroxide solution from the A-25 column and its quantity is estimated spectrophotometrically at 400 nm. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |