Arsenic in water
Arsenic as a water pollutant
Arsenic can be found naturally in certain soils. When arsenic comes in contact with groundwater it may end up in water, as well. Arsenic is a metalloid, which basically means that it has the properties of both metal and non-metal. As a compound, arsenic may be toxic. That is why it is commonly applied in rat poison.
Which arsenic concentrations can be in drinking water?
The WHO (World Health Organization) advices a maximum concentration of 10 ppb. Although arsenic may be found in surface water, groundwater is the main source of arsenic in water. Consequentially, concentrations above 10 ppb may be found naturally in groundwater.
How can we remove arsenic from water?
Arsenic can be removed from water in various ways. Examples of water purification techniques that may be applied are iron and aluminum coagulation, activated alumina adsorption, ion exchange and membrane filtration. AS-V can be removed easier than AS-III. AS-III can be removed when it is pre-oxidised to AS-V.