Optički senzori za određivanje žive

undergraduate thesis

• Title (english): Optical sensors for mercury determination
• Author: Silvija Bukvić
• Mentor: Lidija Furač (mentor)
• Committee member: Lidija Furač (predsjednik povjerenstva)
• Committee member: Nataša Perin (član povjerenstva)
• Committee member: Dajana Kučić Grgić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2018-09-18, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry; Applied Chemistry

Abstract

Živa je globalno onečišćivalo koje vrlo lako dospijeva u atmosferu, dugo se zadržava u okolišu i štetno djeluje na ljudsko zdravlje i ekosustav. U okolišu kruži kroz biogeokemijski ciklus, najprije isparavanjem u atmosferu, a nadalje u hidrosferu i biosferu. Stoga je praćenje koncentracije žive u okolišu od izuzetne važnosti jer se radi o vrlo otrovnoj tvari koja štetno djeluje na središnji živčani sustav. Unaprjeđenjem tehnologije, osmišljeni su kemijski senzori koji se mogu minijaturizirati do veličine mikrometra i dati brz odgovor na koncentraciju živinih iona u nekom uzorku. Kemijski senzor se sastoji od receptorskog i pretvorničkog dijela, a zadatak mu je „kemijski signal“ pretvoriti u analitički koristan signal. Optički senzor je podvrsta kemijskog senzora koji se zasniva na optičkoj promjeni vidljivoj golim okom. Najčešće su to senzori bazirani na fluorescenciji, luminiscenciji, raspršenju svjetla, apsorbanciji i dr. U radu su opisane metode kojima se mogu odrediti male koncentracije žive u uzorku. To su: kolorimetrijska detekcija živinih iona, Hg2+ u vodenom mediju koristeći DNA-funkcionalne zlatne nanočestice, optički senzor za vizualno otkrivanje žive koristeći mezoporozni silikagel za vezanje porfirinskih čestica, visoko selektivni i jednostavni fluorescentni senzor za detekciju živinih (II) iona temeljen na stvaranju kompleksa cisteamin kadmij/telurij kvantnim točkama (CA-CdTe QDs), sintetiziranim metodom povratne reakcije. Opisana su najnovija istraživanja u cilju detekcije iona žive u živom organizmu.

Abstract (english)

Mercury is a global pollutant that is easily absorbed into the atmosphere, long-lasting in the environment and damaging to human health and the ecosystem. In the environment mercury circulates through a biogeochemical cycle, first by evaporation into the atmosphere, and further into the hydrosphere and the biosphere. The monitoring of the concentration of mercury in the environment is extremely important because it is a highly toxic substance that adversely affects the central nervous system. With the advancement of technology, chemical sensors are designed to fit to the size of the micrometer and give a quick response to the concentration of mercury ions in a sample. The chemical sensor consists of the receptor and the conversion part, and the task is to turn the "chemical signal" into an analytically useful signal. The optical sensor is a subtype of a chemical sensor based on an optical change visible to the naked eye. Most optical sensors are based on fluorescence, luminence, light disperse, absorbanation, etc. The paper describes methods for determining small concentrations of mercury in the sample. Methods are: Colorimetric detection of mercuric ion in aqueous media using DNA-functionalized gold nanoparticles, Optical sensor for the visual detection of mercury using mesoporous silica anchoring porphyrin moiety, A highly selective and simple fluorescent sensor for mercury (II) ion detection based on cysteamine-capped CdTe quantum dots synthesized by the reflux method. The most recent research has been described in order to detect the mercury ions in the living organism.

• Keywords: živa; biogeokemijski ciklus; kemijski senzori; optički senzori; kolorimetrijska detekcija
• Keywords (english): mercury; biogeochemical cycle; chemical sensors; optical sensors; colorimetric detection
• Language: croatian
• URN:NBN: urn:nbn:hr:149:274095
• Study programme: Title: Applied Chemistry - Undergraduate study; specializations in: Environmental chemistry and green technologies, Advanced materials and technologies, Applied organic chemistry; Course: Applied organic chemistry; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) primijenjene kemije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-05-17 13:15:51