Determination of anions and cations in the processed and unprocessed water samples by using spectrophotometry, ion chromatography and voltammetry

Rad je baziran na spektrofotometrijskoj analizi prerađene i neprerađene vode u trajanju od 5 tjedana. Spektrofotometrijskom analizom određivana je koncentracija mangana, željeza i amonijaka u vodi. Drugi dio rada bazira se na kromatografskoj analizi gdje su određivane koncentracije amonijevih (\( {NH_{4}}^{+} \)), nitratnih (\( {NO_{3}}^{-} \)), nitritnih (\( {NO_{2}}^{-} \)) i sulfatnih (\( {SO_{4}}^{2-} \)) iona. Koncentracija ukupnog arsena (\(As^{3+} \) i \(As^{5+} \) iona) određena je anodnom „stripping“ voltametrijom dok je za određivanje arsenitnih iona (\(As^{3+} \)) korištena diferencijalna pulsna voltametrija sa modificiranom elektrodom od staklastog ugljika. Cilj istraživanja bio je određivanje koncentracije navedenih kationa i aniona u prerađenoj i neprerađenoj vodi. Dobivene vrijednosti uspoređene su sa zakonskim regulativama. Uzimanje uzoraka vode koji su se koristili za ispitivanja mora se vršiti prema zakonom propisanim postupcima. Svrha redovitog praćenja odgovarajućih parametara je dobivanje osnovnih podataka o fizikalno-kemijskoj i mikrobiološkoj kvaliteti vode za ljudsku potrošnju te podataka o učinkovitosti rada postrojenja.Our study was based on spectrophotometric analysis of processed and unprocessed water in 5 weeks’ time period. Spectrophotometric analysis was used to determine concentrations of manganese, iron and ammonia in water. The second part of our work is based on chromatographic analysis where concentrations of ammonium (\( {NH_{4}}^{+} \)), nitrate (\( {NO_{3}}^{-} \)), nitrite (\( {NO_{2}}^{-} \)), sulphate (\( {SO_{4}}^{2-} \)) ions were determined. Total arsenic concentration (\(As^{3+} \) and \(As^{5+} \) ions) was detected with anodic stripping voltammetry, while. arsenite ions (\(As^{3+} \)) concentration was obtained with differential pulse voltammetry by using modified glassy carbon electrode. The aim of this study was to determine the concentrations of the listed anions and cations in processed and unprocessed water samples. Obtained values were compared with legal regulations. Sampling of water for determination of its properties must be made according to the procedures regulated by law. The purpose of regular examination is obtaining basic information about physical, chemical and microbiological quality of the water for human use, and obtaining the data about efficiency of plant operation