SERS analiza prioritetnih onečišćivala

undergraduate thesis

• Title (english): SERS analysis of priority pollutants
• Author: Ema Kovačević
• Mentor: Šime Ukić (mentor)
• Committee member: Šime Ukić (predsjednik povjerenstva)
• Committee member: Matija Cvetnić (član povjerenstva)
• Committee member: Dajana Kučić Grgić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2019-09-09, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry

Abstract

Pesticidi su kemijske ili biološke tvari koje se koriste s ciljem sprječavanja djelovanja različitih nametnika, korova i prijenosnika bolesti pri uzgoju hrane. Kao onečišćivači predstavljaju vrlo visok rizik za ljudsko zdravlje. Količina pesticida u hrani ograničena je zakonima postavljenim uz savjete Europske agencije za sigurnost hrane; ona odobrava korištenje pesticida pri zaštiti biljaka i životinja ovisno o mogućnoj daljnjoj štetnosti na zdravlje i okoliš. Dopuštena količina ovisi i o samom proizvodu (npr. voće, mliječni proizvodi...), a vrijednosti variraju oko 1 mg/kg proizvoda. Budući da se pesticidi u prehrambenim proizvodima pojavljuju u vrlo niskim koncentracijama, za njihovo otkrivanje potrebno je koristiti vrlo osjetljive metode. Količina pesticida u ovom radu analizirana je Ramanovim spektrometrom koristeći metodu površinski pojačanog Ramanovog raspršenja (engl. Surface-Enhanced Raman Scattering, SERS), koja pojačava odziv molekula apsorbiranih na nanostrukturama plemenitih metala. Za potrebe promatranja pesticida pripremljene su dvije vrste nanostruktura srebra: nanoprizme i nanosfere. SERS metoda korištena je u svrhu detekcije malih koncentracija pesticida, ali i za proučavanje utjecaja različitih nanostruktura (prizme, sfere) na samu detekciju.

Abstract (english)

Pesticides are chemical or biological substances used to prevent activity of different types of pests, weeds and diseases in food cultivation. Yet, they present a severe risk to human health as pollutants. The allowed amount of pesticides in food is limited by laws with the help of European agency for food safety which approves the usage of pesticides for plants and animal protection on EU territory, considering the possible side-effects on human health and environment. The allowed amount depends on the product in which the residue could be found (e.g. fruit, dairy products, etc.) but it usually varies around 1 mg/kg of product. Considering that concentrations of pesticides in food products are rather low, a highly sensitive method must be applied for pesticide detection. In this paper pesticides were determined by Surface-Enhanced Raman Scattering; SERS, which increases response of molecules adsorbed on noble metals nanostructures. Two different types of nanoparticles were applied in this research: nanospheres and nanoprisms. SERS method was used to detect small concentrations of pesticides, but also to study the effect that different nanostructures (prisms or spheres) might have on the detection.

• Keywords: pesticidi; adsorpcija; nanosfere; nanoprizme; SERS
• Keywords (english): pesticides; adsorption; nanosphere; nanoprisms; SERS
• Language: croatian
• URN:NBN: urn:nbn:hr:149:756329
• Project: Number: IP-2014-09-7992; Title: Modeliranje okolišnih aspekata napredne obrade voda za razgradnju prioritetnih onečišćivala; Title: Modeling of environmental aspects of advanced water treatment for fegradation of priority pollutants; Acronym: MEAoWT; Leader: Tomislav Bolanča; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: IP
• Study programme: Title: Chemical Engineering - Undergraduate study; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-05-24 10:03:04