Arsenic in the water can exist in two forms, trivalent arsenic, known as As3 +, and pentavalent arsenic, known as As5 +. Both of these forms can be removed by appropriate purification methods -. Adsorption, ion exchange, reverse osmosis, etc. Another effective method of removing arsenic ions from water based on the ability of the iron oxide nanoparticles (rust) interact with arsenic ions, which are then removed by magnetic treatment.

Fe3+ + AsO4 3- =  FeAsO4 insoluble

There are special units for removal of arsenic ions for this technology.The magnetic iron powder we remove the oil. See the file.

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Thank you Yuri for your answer. I must say this is a very interesting approach in removing arsenic, however, few question that comes up on mind are; about the effectiveness of this process? does iron oxide nano particle take up most of the arsenic ions from water? and how does the ideal  amount of the iron nano particles is determined?

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You can see for yourself in the articles, patents and description of technology firms.

Regards.

Dr.Yuri,

"Another effective method of removing arsenic ions from water based on the ability of the iron oxide nanoparticles (rust) interact with arsenic ions, which are then removed by magnetic treatment ........" - Is it the latest method on arsenic removal? How far it is effective over the other existing methods?

Thanks and regards