| http://www.w3.org/ns/prov#value | - Clearly, the type of association will depend on the nature of the surface and the label in any given case; different functional groups will be attracted to a positively-charged surface, for instance, as to a negatively-charged one. [0055] Suitable groups by which the complex may be bound to the active surface include complexing groups such as nitrogen, oxygen, sulphur and phosphorous donors; chela
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