Removal of iron for the spectrophotometric determination of humic substances in fresh waters |
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| Authors: | Tsutomu Nomizu Masaki Sanji Atsushi Mizuike |
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| Institution: | Faculty of Engineering, Nagoya University, Chikusa-ku, Nagoya 464 Japan |
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| Abstract: | More than 95% iron in water is removed by sorption on a cation-exchange resin after reduction to iron(II) with hydroxylammonium chloride at pH 3.5 for 24 h. The absorbance is then measured at 350 nm for the reliable determination of humic substances. |
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