Primjena derivacijske spektroskopije u određivanju mangana u pitkim vodama u prisustvu željeza

master's thesis

• Title (english): Application of derivate spectroscopy in determination of manganese in drinking water in the presence of iron
• Author: Ana Merkler
• Mentor: Damir Iveković (mentor)
• Granter: University of Zagreb; Faculty of Food Technology and Biotechnology; (Department of Chemistry and Biochemistry); (Laboratory for General and Inorganic Chemistry and Electroanalysis); Zagreb
• Defense date and country: 2010-04-06, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Biotechnology

Abstract

Kontrola kakvoće vode za piće nužna je zbog zadovoljavanja zakonskih kriterija o ispravnosti vode, kao i zbog uspješne provedbe tehnoloških postupaka pročišćavanja vode za piće. Jedna od skupina pokazatelja ispravnosti vode za piće koju je nužno pratiti je sadržaj pojedinih metala u vodi, među kojima se nalazi i mangan. Za određivanje mangana u vodi za piće razvijene su brojne analitičke metode, od kojih se svojom jednostavnošću ističu spektrofotometrijske metode. Nedostatak većine korištenih spektrofotometrijskih metoda za određivanje mangana je uporaba cijanida kao maskirnog reagensa za sprječavanje interferencije željeza. Cilj ovog rada bio je razviti jednostavnu spektrofotometrijsku metodu određivanja mangana u pitkoj vodi, s posebnim naglaskom na vode koje osim mangana u značajnijoj količini sadrže i željezo. Razvijena je metoda koja se temelji na mjerenju apsorbancije kompleksa između Mn2+ kationa i 4-(2-piridilazo) rezorcinola. Interferirajući efekt željeza izbjegnut je uporabom derivacijske spektrofotometrije, mjerenjem vrijednosti d2A/dλ2 pri 533 nm. Metoda omogućuje simultano određivanje željeza u binarnim smjesama, mjerenjem vrijednosti d2A/dλ2 pri 723 nm uz zadovoljavajuću osjetljivost i preciznost.

Abstract (english)

Quality control of drinking water is essential for meeting the legal criteria of water validity, as well as the successful implementation of technological processes of water purification. One group of indicators of water quality which is necessary to monitor is the content of certain metals, including manganese. For determination of manganese in drinking water there have been developed numerous analytical methods, but spectrophotometric methods stands out for its simplicity. The drawback of most used spectrophotometric method for determination of manganese is the use of cyanide as a masking reagent to prevent interference of iron. The aim of this study was to develop a simple spectrophotometric method for manganese determination in drinking water, with special emphasis on waters that beside significant amount of manganese, contain iron as well. A developed method is based on measuring the absorbance of the complexes between Mn2+ cations and 4-(2-pyridylazo) resorcinol. Iron interference was avoided by using derivative spectrometry and measuring the value of d2A/dλ2 at 533 nm. Simultaneous determination of Fe in binary mixtures with Mn was achieved with satisfactory sensitivity and precision by measuring the value of d2A/dl2 at 273 nm.

• Keywords: mangan; željezo; pitka voda; PAR; derivacijska spektrofotometrija
• Keywords (english): manganese; iron; drinking water; PAR; derivative spectrophotometry
• Language: croatian
• URN:NBN: urn:nbn:hr:159:459163
• Study programme: Title: Biotechnology; specializations in: Biochemical Engineering; Course: Biochemical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: diplomirani inženjer biotehnologije; smjer biokemijsko inženjerstvo (diplomirani inženjer biotehnologije; smjer biokemijsko inženjerstvo)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2017-08-28 10:15:12