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Arsenic in drinking water wells on the Bolivian high plain: Field monitoring and effect of salinity on removal efficiency of iron-oxides containing filters K. VAN Synthetic drinking water could be treated effectively by the IOCS and CIM based filters reducing As to concentrations lower than 10 µg L -1 . High levels of chloride and sulphate did not influence As removal efficiency. However, phosphate concentrations in the range from 4 to 24 mg L -1 drastically decreased removal efficiency of the IOCS based filter but had no effects on removal efficiency of the CIM based filter. Results of this study can be used as a base for further testing and practical implementation of drinking water purification in the Oruro region.

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