MIHAELA CIOPEC, ADINA NEGREA, NARCIS DUTEANU, CORNELIU MIRCEA DAVIDESCU, IOSIF HULKA, MARILENA MOTOC, PETRU NEGREA, OANA GRAD, DELIA BERCEANU VADUVA AS(III) REMOVAL BY DYNAMIC ADSORPTION ONTO AMBERLITE XAD7 FUNCTIONALIZED WITH CROWN ETHER AND DOPED WITH FE(III) IONS Arsenic content in groundwater’s present a wide range of concentration, ranging from hundreds of micrograms to thousands of micrograms of arsenic per litter, while the maximum permitted arsenic concentration established by World Health Organization (WHO) is 10 mg L-1. According to the WHO all people, regardless of their stage of development and their social economic condition, have the right to have access to adequate drinking water. The most efficient and economic technique used for arsenic removal is represented by adsorption. In order to make this remediation technique more affordable and environmentally friendly is important to new materials with advance adsorbent properties. Novelty of present paper is represented by the usage of a new adsorbent material obtained by physical - chemical modification of Amberlite XAD polymers using crown ethers followed by iron doping, due to well-known affinity of arsenic for iron ions. Present paper aims to test the obtained modified Amberlite polymer for arsenic removal from real groundwater by using adsorption in a fixed bed column, establishing in this way a mechanism for the adsorption process. During experimental work was studied the influence of competing ions from real water into the arsenic adsorption process.