Analysis of bisphenol a in thermochromic printing inks, their prints on paper and soil samples during the anaerobic paper degradation

Termokromne boje su materijal čija je uporaba u porastu, a glavne komponente često su im pseudoestrogeni bisfenol A i benzofenon. Za identifikaciju i kvantifikaciju ovih spojeva u termokromnim bojama razvijena je tekućinskokromatografska metoda obrnutih faza s UV-detekcijom. Tri od analiziranih petnaest uzoraka boja sadržavali su bisfenol A s masenim udjelima oko 2 %, a dva uzorka benzofenon s masenim udjelima od 0,34 % i 0,66 %. Termokromna boja koja sadrži bisfenol A i koju je moguće tiskati u laboratorijskim uvjetima otisnuta je na različite vrste papira. Razvijena je tekućinskokromatografska metoda za određivanje bisfenola A u termokromnim otiscima na papiru ekstrakcijom metanolom. Maseni udio bisfenola A u papirima bio je od 0,126 mg g‒1 do 0,778 mg g‒1. Otisci termokromne boje koja sadrži bisfenol A podvrgnuti su anaerobnoj razgradnji u tlu čime su simulirani uvjeti razgradnje na deponiju otpada. Razvijena je tekućinskokromatografska metoda s UV-detekcijom kojom je određen maseni udio bisfenola A u tlu u vremenu od 14 do 150 dana razgradnje papira i procijenjena brzina njegova raspada. Tijekom anaerobne ragradnje maseni udio bisfenola A u termokromnim papirima smanjio se do vrijednosti bliske granici određivanja metode od 0,0025 mg g‒1. Maseni udio bisfenola A u tlu tijekom anaerobne razgradnje se povećavao i nakon 150 dana razgradnje bio je od 3,21 ng g‒1 do 35,1 ng g‒1.Thermochromic inks, materials increasingly used, may contain pseudo-estrogens bisphenol A and benzophenone as main ingredients. To identify and quantify these compounds, reversed-phase liquid chromatographic method with UV-detection was developed. Three out of 15 analyzed samples contained bisphenol A in mass fractions of about 2 %. Two samples contained benzophenone with mass fractions of 0,34 % and 0,66 %. Thermochromic ink that contains bisphenol A and was applicable in laboratory conditions was printed on various types of papers. Liquid chromatographic method for determination of bisphenol A extracted in methanol was developed. Mass fraction of bisphenol A in papers was from 0,126 mg g–1 to 0,788 mg g–1. Prints of thermochromic ink containing bisphenol A were subjected to anaerobic degradation in soil to simulate the conditions at a landfill site. Reversed-phase liquid chromatographic method with UV-detection was developed to determine mass fraction of bisphenol A in soil at time intervals from 14 to 150 days, and the rate of its degradation was estimated. During the anaerobic degradation, mass fraction of bisphenol A in papers decreased to value close to detection limit of the method of 0,0025 mg g–1. Mass fraction of bisphenol A in soil increased during the anaerobic degradation, and after 150 days ranged from 3,21 ng g–1 to 35,1 ng g–1