title: Study of contamination sources in the process of cryogenic grinding.
abstract: The study of contamination effect during cryogenic grinding of pure cellulose was carried out. The optimisation of important parameters of the grinding process (pre-cooling time, grinding time, cooling time and number of cycles) was performed and the different sources of a possible contamination of samples (earlier processed sample, metal parts of grinding tool) were evaluated. The results of ICP-oa-TOF MS analysis after microwave digestion of cellulose samples were used in this study. Significant contamination of cellulose samples by Fe at the level 130 microg kg(-1) caused by wearing of steel stoppers and an impact bar was detected. Cross-contamination by Fe, Cr, Mn and Cu at the level 400, 200, 200 and 2100 microg kg(-1), respectively was caused by previous grinding of electro-waste sample. This cross-contamination was possible to be avoided by changing of a polycarbonate part of a grinding vessel.
authors.affiliation: Department of Environmental Protection, University of Pardubice, Cs. legií 565, Pardubice 532 10, Czech Republic. milan.pouzar@upce.cz
authors.forename: Miloslav
authors.initials: M
authors.lastname: Pouzar
authors.forename: Anna
authors.initials: A
authors.lastname: Krejcová
authors.forename: Tomás
authors.initials: T
authors.lastname: Cernohorský
authors.forename: Kvĕta
authors.initials: K
authors.lastname: Pesková
mesh_terms: D002482:Cellulose / Q000032:analysis*; D004340:Drug Contamination; D007501:Iron; D013058:Mass Spectrometry; D008670:Metals
chemical_list: D008670:Metals; D002482:Cellulose; D007501:Iron