Kemijske pretvorbe aerosolov α-pinena

Meža, Kristjan (author), Pompe, Matevž (mentor)

Raziskal sem reakcijo α-pinena s singletnim kisikom zaradi pomena v okolju. Ta se namreč v atmosferi oksidira, pri čemer nastajajo SOA. α-pinen sem reagiral s singletnim kisikom, pri čemer sem za tvorbo singletnega kisika uporabili metilen modro. Razvil sem metodo in optimiziral ločbo α-pinena in nastalih hidroperoksidov s HPLC. Primerjal sem tri kromatografske kolone in določil najbolj primerno. Preveril sem ponovljivost metode in izračunal konverzijo reakcije. Preučil sem vpliv toplote ter UV svetlobe na nastale hidroperokside. Hidroperoksidi so hitreje razpadali pod vplivom UV svetlobe. Opazoval sem vpliv askorbinske kisline na tvorbo dimerov hidroperoksidov ter ugotovil, da se ob dodatku askorbinske kisline njihova koncentracija zmanjša. Preučil sem kinetiko reakcije med α-pinenom in singletnim kisikom. Za izračun reda sem uporabil tako diferencialno kot integralno metodo. Reakcija izgleda ničelnega reda glede na α-pinen.

• Language: Slovenian
• Keywords: α-pinen, singletni kisik, HPLC, SOA
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2019
• PID: 20.500.12556/RUL-109862
• COBISS.SI-ID: 1538410691
• Publication date in RUL: 09.09.2019

Secondary language

• Language: English

Abstract

I studied the reaction of α-pinene with singlet oxygen for its importance in the environment. α-pinene is oxidised in the atmosphere forming SOA. α-pinene was reacted with singlet oxygen. Singlet oxygen was formed using methylene blue. I developed and optimized a method for the separation of α-pinene and the formed hydroperoxides using HPLC. I compared three different chromatographic columns and determined the most suitable one. I tested the repeatability of the method and calculated the conversion of the reaction. The effect of heat and UV light on hydroperoxides was studied. The hydroperoxides decayed faster under UV light. I observed the effect of ascorbic acid on the formation of dimers of hydroperoxides and discovered that the concentration of dimers is lowered when ascorbic acid is added. The kinetics of the reaction between α-pinene and singlet oxygen was studied. The order of the reaction was determined using the differential method and the integral method. The reaction appears to be zeroth order with regards to α-pinene.

• Keywords: α-pinene, singlet oxygen, HPLC, SOA