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Studies on the adsorption of cadmium on hydrous iron(III) oxides in oxic sediments

✍ Scribed by W. Petersen; K. Wallmann; S. Schröer; F. Schroeder

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
656 KB
Volume
273
Category
Article
ISSN
0003-2670

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✦ Synopsis

The mfluence of freshly formed hydrous lron(II1) oxides m the 0x1~ layers m sediments on the exchange processes of cadmmm between the mtenhtlal and the overlymg water was mvestlgated By the formatlon of Iron oxides as coatmgs on clay mmerals it 1s possible to measure the dissolved part of cadmmm wrth dtierentml-pulse anodlc stnppmg voltammetry Hnthout disturbances of colloidal particles The results were compared wth theoretical calculations usmg a surface complexmg mode1 The measurements showed that 0 1 mm01 of FeOOH coated on the clay mmeral kaobmte (1 g) can adsorb up to 95% of the added cadmmm (1 pm01 1-l) The measured adsorptlon agreed well with the estunatlons of the theoretical mode1 The mvestlgatlon of the influence of compehtlve Ions (CaZ+ and PO:-) showed that both Ions reduced the proportlon of adsorbed cadmmm whereas the model postulates higher adsorptlon wth phosphate The measurements showed that freshly formed hydrous lron(III) oxides may act as a natural bamer to the dffislve flux of tome trace elements mto the overlymg water

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