Abstract
The interface interaction of Cu(I) with 2,9-dimethyl-4, 7-diphenyl-1,10-phenanthrolinedisulphonic acid immobilized onto silica modified with polyhexamethylene guanidine was studied. The high affinity of metal ion to the modified silica surface was found to be due to the presence of a complex, which is formed as a result of interaction between Cu(I) and immobilized 2,9-dimethyl-4,7-diphenyl-1,10-phenanthrolinedisulphonic acid. This reaction was successfully applied to develop an adsorption-photometric method for determining copper concentrations in waters of different types. The detection limit is 0.01 μg per 0.1 g of adsorbent. The calibration function is linear up to 10 μg per 0.1 g of adsorbent. The colour scale and indicator pipe technique were proposed for rapid test determination of copper concentrations in various water types. The detection limit for copper using the pipe technique is 1 μg/l (volume of the water, 50 ml).
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