Oscilatorna reakcija kao sistem detektor za dopirane i nedopirane fosfat-volframove bronze
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Abstract
Fosfat-volframove bronze, dobijene termičkim tretmanom, su nedovoljno ispitane bronze i o njihovom ponašanju i strukturi malo se zna. Brigs-Raušer (Briggs-Rauscher, BR) oscilatorna reakcija se zbog svoje izrazite osetljivosti na prisustvo aditiva nameće kao jedna od mogućih metoda za dobijanje neophodnih informacija o osobinama ovih bronzi. U ovom radu, ispitan je uticaj fosfat-volframove (PWB) i fosfat-volframove bronze dopirane litijumom (LiPWB) na dinamiku oscilatorne BR reakcije. Prisustvo volframovih bronzi značajno smanjuje dužinu oscilatornog perioda BR reakcije. Dobijeni rezultati pokazuju da PWB ima jači uticaj na dužinu oscilatornog perioda u odnosu na LiPWB. U oba slučaja, oscilatorni period je linearna funkcija mase dodate bronze. Dobijena linearna zavisnost se može uspešno koristiti kao kalibraciona kriva za određivanje kako nepoznate mase bronze, ali i kao potencijalni sistem-detektor za dopirane i nedopirane fosfat-volframove bronze, s obzirom na različiti nagib koje ove dve kalibracione krive poseduju. Rezultati optičke emisione spektrometrije sa indukovano spregnutom plazmom (ICP-OES) pokazuju da je jaka oksidaciona sredina narušila strukturu fosfat-volframovih bronzi, s obzirom na prisustvo litijuma i volframa u rastvoru. U skladu sa tim, predloženi mehanizam dejstva bronzi najverovatnije je građenje volfram-perokso kompleksa pri čemu dolazi do menjanja ukupne kinetike BR reakcije.
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