Question

what is the action of chlorine on Arsenic​

Answer 1

Answer:

Arsenic is widespread in soils, water and air. In natural water the main forms are arsenite (As(III)) and arsenate (As(V)). The consumption of water containing high concentration of arsenic produces serious effects on human health, like skin and lung cancer. In Italy, Legislative Decree 2001/31 reduced the limit of arsenic from 50 to 10 μg/L, in agreement with the European Directive 98/83/EC. As consequence, many drinking water treatment plant companies needed to upgrade the existing plants where arsenic was previously removed or to build up new plants for arsenic removal when this contaminant was not previously a critical parameter. Arsenic removal from water may occur through the precipitation with iron or aluminum salts, adsorption on iron hydroxide or granular activated alumina (AA), reverse osmosis and ion exchange (IE). Some of the above techniques, especially precipitation, adsorption with AA and IE, can reach good arsenic removal yields only if arsenic is oxidized. The aim of the present work is to investigate the efficiency of the oxidation of As(III) by means of four conventional oxidants (chlorine dioxide, sodium hypochlorite, potassium permanganate and monochloramine) with different test conditions: different type of water (demineralised and real water), different pH values (5.7-6-7 and 8) and different doses of chemicals. The arsenic oxidation yields were excellent with potassium permanganate, very good with hypochlorite and low with monochloramine. These results were observed both on demineralised and real water for all the tested reagents with the exception of chlorine dioxide that showed a better arsenic oxidation on real groundwater than demineralised water.

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Answer 2

Chlorine is used to purify the water from arsenic

Explanation:

Chlorine effect on arsenic (As) releases dynamics during municipal solid waste (MSW) incineration in a fluidized bed on the basis of the on-line analysis system .This system used in measure the qualitative concentration of trace elements in fuel gas. Chlorine addition enhances the concentration of arsenic in flue gas, which shows a promoting effect of chlorine on arsenic release during MSW incineration. The addition of chlorine in minerals  which prevent the reaction of arsenic with minerals and also enhance the volatilization of arsenic   by addition of chlorine with arsenics and form arsenic chlorides.