chelated by additives oil

[Marina Khabibullina]

Как перевести сочетание chelated by additives в данном контексте:
When properly staged during a well stimulation with acid, chlorine dioxide will
convert the iron sulfide to water-wet hydrous ferric oxide which is then chelated by additives
in the acid.
Текст о методах очистки нефтяных скважин.

[Karabas]

хелатированный добавками (с т.з. переводчика с химическим, но не нефтегазовым уклоном)