Antimony interactions with heterogeneous complexants in waters, sediments and soils: A review of data obtained in bulk samples

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Antimony, Waters, Soils, Sediments, Complexants

Scientific paper

Published studies where antimony association with colloidal and particulate phases is studied in waters, soils and sediments are reviewed. The techniques considered range from the simple calculation of partition coefficients, the application of size-based speciation methods or sequential extraction techniques to the use of more sophisticated techniques such as X-ray absorption spectroscopy (XAS). What these methods have in common is that they are applied directly to bulk samples and that, with the exception of XAS, they give operationally defined results, which are very often difficult to interpret and compare. In the case of the extraction methods, which are the most commonly used, this difficulty is compounded by the tendency of many authors to endlessly modify the experimental procedures. Antimony does not seem to associate to any significant extent with colloidal and particulate phases in waters. However, at the same time, it appears not to be easily extractable from soils where, even if it is usually present to a certain extent in 'iron oxide' fractions in sequential extraction methods, most remains in the so called 'residual' fraction. Unfortunately, the direct application of XAS techniques to real environmental samples, which could help to clarify antimony binding by solid phases, is precluded in most systems because of their insensitivity; only a few heavily polluted systems have been studied so far using these techniques. In these studies antimony is present as Sb(V) in soils and significantly bound by iron oxide phases.

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