prikaz prve stranice dokumenta Utjecaj pH vrijednosti na spontano taloženje kalcijeva karbonata uz dodatak poli-L-asparginske kiseline ; Kemija u kapljici tvrde vode
  Download
PDF 2.95 MB
master's thesis
Utjecaj pH vrijednosti na spontano taloženje kalcijeva karbonata uz dodatak poli-L-asparginske kiseline ; Kemija u kapljici tvrde vode
Zagreb: University of Zagreb, Faculty of Science, 2021. urn:nbn:hr:217:502020
Vojtkuf, Iva
University of Zagreb
Faculty of Science
Department of Chemistry
University of Zagreb
Faculty of Science
Department of Physics

Institutional repository: Repository of the Faculty of Science

Cite this document

Vojtkuf, I. (2021). Utjecaj pH vrijednosti na spontano taloženje kalcijeva karbonata uz dodatak poli-L-asparginske kiseline ; Kemija u kapljici tvrde vode (Master's thesis). Zagreb: University of Zagreb, Faculty of Science; Zagreb: University of Zagreb, Faculty of Science. Retrieved from https://urn.nsk.hr/urn:nbn:hr:217:502020

Vojtkuf, Iva. "Utjecaj pH vrijednosti na spontano taloženje kalcijeva karbonata uz dodatak poli-L-asparginske kiseline ; Kemija u kapljici tvrde vode." Master's thesis, University of Zagreb, Faculty of Science; University of Zagreb, Faculty of Science, 2021. https://urn.nsk.hr/urn:nbn:hr:217:502020

Vojtkuf, Iva. "Utjecaj pH vrijednosti na spontano taloženje kalcijeva karbonata uz dodatak poli-L-asparginske kiseline ; Kemija u kapljici tvrde vode." Master's thesis, University of Zagreb, Faculty of Science; University of Zagreb, Faculty of Science, 2021. https://urn.nsk.hr/urn:nbn:hr:217:502020

Vojtkuf, I. (2021). 'Utjecaj pH vrijednosti na spontano taloženje kalcijeva karbonata uz dodatak poli-L-asparginske kiseline ; Kemija u kapljici tvrde vode', Master's thesis, University of Zagreb, Faculty of Science; University of Zagreb, Faculty of Science, accessed 22 November 2024, https://urn.nsk.hr/urn:nbn:hr:217:502020

Vojtkuf I. Utjecaj pH vrijednosti na spontano taloženje kalcijeva karbonata uz dodatak poli-L-asparginske kiseline ; Kemija u kapljici tvrde vode [Master's thesis]. Zagreb: University of Zagreb, Faculty of Science; Zagreb: University of Zagreb, Faculty of Science; 2021 [cited 2024 November 22] Available at: https://urn.nsk.hr/urn:nbn:hr:217:502020

I. Vojtkuf, "Utjecaj pH vrijednosti na spontano taloženje kalcijeva karbonata uz dodatak poli-L-asparginske kiseline ; Kemija u kapljici tvrde vode", Master's thesis, University of Zagreb, Faculty of Science, Zagreb; University of Zagreb, Faculty of Science, Zagreb, 2021. Available at: https://urn.nsk.hr/urn:nbn:hr:217:502020

Metadata
TitleUtjecaj pH vrijednosti na spontano taloženje kalcijeva karbonata uz dodatak poli-L-asparginske kiseline ; Kemija u kapljici tvrde vode
Title (english)Influence of pH on calcium carbonate spontaneous precipitation with the addition of poly-L-aspartic acid ; Chemistry in a drop of hard water
AuthorIva Vojtkuf
MentorJasminka Kontrec (mentor)
Committee memberJasminka Kontrec (predsjednik povjerenstva)
Committee memberDraginja Mrvoš-Sermek (član povjerenstva)
Committee memberMaja Planinić (član povjerenstva)
Committee memberNenad Pavin (član povjerenstva)
Committee memberDavor Kovačević (član povjerenstva)
Committee memberKatarina Jeličić (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Science
(Department of Chemistry)
Zagreb
GranterUniversity of Zagreb
Faculty of Science
(Department of Physics)
Zagreb
Defense date and country2021-12-02, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Abstract
Ovaj rad sastoji se od istraživačkog i metodičkog dijela. U istraživačkom dijelu istražen je proces spontanog taloženja kalcijeva karbonata u prisustvu poli-L-asparaginske kiseline kao modelnog taložnog sustava za istraživanja biomineralizacije u morskim organizmima. Napredovanje procesa taloženja praćeno je potenciometrijski, a talozi karakterizirani infracrvenom spektroskopijom i pretražnom elektronskom mikroskopijom. Svi relevantni početni parametri taložnog sustava (prezasićenost, omjer aktiviteta kalcijevih i karbonatnih iona, temperatura, ionska jakost) bili su konstantni, a promatrani su utjecaji početnog pH (pH0) u rasponu od 8,5 do 10,5 te koncentracije poli-L-asparaginske kiseline. Proces taloženja kalcijeva karbonata je inhibiran u cijelom ispitivanom području pH0 vrijednosti zbog djelovanja poli-L-asparaginske kiseline, a efekt je izraženiji u sinergiji s Mg2+ ionima. U metodičkom dijelu rada pod naslovom Kemija u kapljici tvrde vode načinjen je pregled i kritički osvrt udžbeničke i stručne literature na zadanu temu. Opisana je nastavna jedinica za 90- minutni nastavni sat za učenike četvrtog razreda gimnazije te su predloženi radni listić i uputa za nastavnike temeljena na učenju otkrivanjem.
Abstract (english)
This Diploma thesis consist of two parts: the research part and the methodological part. The research part investigates the process of spontaneous precipitation of calcium carbonate in the presence of poly-L-aspartic acid as a model precipitation system for biomineralization research in marine organisms. The progress of the precipitation process was monitored potentiometrically and the precipitate were characterized by infrared spectroscopy and scanning electron microscopy. All relevant initial parameters of the precipitation system (supersaturation, calcium and carbonate ion activity ratio, temperature, ionic strength) were constant and the influence of the initial pH (pH0) in the range of 8,5 to 10,5 and the concentration of poly-L-aspartic acid were investigated. The process of calcium carbonate precipitation is inhibited in the whole examined range of pH0 values due to the influence of poly-L-aspartic acid, and the effect is more pronounced in synergy with Mg2+ ions. In the methodological part of the Thesis entitled Chemistry in a drop of hard water, critical review of textbooks and professional literature was made. The class for a 90-minute lesson for fourth-grade high school students is described while worksheets and instructions based on discovery learning are proposed to teachers as well.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:217:502020
Study programmeTitle: Physics and Chemistry; specializations in: Education
Course: Education
Study programme type: university
Study level: integrated undergraduate and graduate
Academic / professional title: magistar/magistra edukacije fizike i kemije (magistar/magistra edukacije fizike i kemije)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2021-12-15 09:03:41