| 摘要 |
Specific complexing agents are very effective, specific complexing agents for certain metal ions, namely Cu, Fe, Zn, Ni and Co, but not for calcium ions. Thus, these specific agents are very effective complexing agents in technical applications, whereby the presence of calcium is unavoidable or even essential and whereby complexing of specific metal ions is required or whereby delivery of specific, chelated metal ions is required. The invention relates to aqueous compositions, comprising calcium ions and metal ions selected from the group comprising Cu, Fe, Zn, Ni and Co, and specific complexing agents (in particular ethylenediamine disuccinic acid, EDDS) and applications for these aqueous compositions, such as in a reductive bleaching process for the bleaching of cellulosic material, such as cotton, pulp or paper; in a process for removal of metal scale; in a process for electroless plating of metal; in a fermentation process, preferably part of a process for clarification of beer or wine; in a process for tanning of leather or human skin; in a process for stabilisation or inhibition of algae, fungi or plant growth; in a process for production or preservation of food; for the treatment of metal dermatitis of the external skin, preferably of copper or nickel dermatitis; for the reduction of the enzymatic activity of enzymes in contact with the human or animal body or skin, preferably lipase enzymes present in the body extrudates, preferably for treatment of enzymatic dermatitis or of malodour of the body; for the treatment of metal poisoning, preferably iron-loading; for the stabilisation or inhibition or reduction of algae, fungi and/or plant growth; and for complexing or chelating of one or more metal ions, selected from the group consisting of Cu, Fe, Zn, Ni and Co. |
