Masking Agents

When the desired specificity for separation cannot be controlled sufficiently by pH modification, addition of a masking agent will frequently be used. Masking agents are complexing agents that form water-soluble complexes which then compete with the extracting agent. The masking agents prevent the extraction of the metals they react with, by forming water-soluble complexes (strong polar complexes) which remain in the aqueous phase. Some extracting agents are specific and many others can be made specific using pH control and/or a masking agent. The most commonly used masking agents include cyanide, thiocyanate, thiosulfate, tartrate, carbonate, citrate, fluoride, bromide, iodide and ethylenediaminetetraacetic acid (EDTA). The effectiveness of masking agents is pH specific, ranging from acidic to basic conditions. In some schemes, more than one masking agent may be used.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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