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An improved dry ash procedure for the detection of titanium dioxide in cattle feces
Author(s) -
Ohmori Hideyuki,
aka Itoko,
Ohtani Fumihiro,
Tajima Kiyoshi,
Kawashima Tomoyuki,
KAJI Yuji,
Terada Fuminori
Publication year - 2013
Publication title -
animal science journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.606
H-Index - 38
eISSN - 1740-0929
pISSN - 1344-3941
DOI - 10.1111/asj.12068
Subject(s) - feces , chemistry , chromium , titanium dioxide , zoology , chromium oxide , sodium , nuclear chemistry , metallurgy , materials science , biology , microbiology and biotechnology , organic chemistry
We improved the dry ash procedure for detecting titanium dioxide ( TiO 2 ) in cattle feces containing chromium dioxide ( Cr 2 O 3 ). First, the effect of amount of sodium sulfate ( Na 2 SO 4 ) on the recovery of TiO 2 from cattle feces that contained Cr 2 O 3 was evaluated. Average recovery of TiO 2 at the 2.5 g Na 2 SO 4 level was significantly higher ( P < 0.0001) than that at 0.75 g Na 2 SO 4 . Second, the effect of Cr 2 O 3 concentration on the recovery of TiO 2 of cattle feces by using two levels of Na 2 SO 4 addition was examined. The recovery of TiO 2 decreased with the increase in the amount of Cr 2 O 3 at the 0.75 g Na 2 SO 4 level but was consistently high at 2.5 g Na 2 SO 4 . Third, the recovery of Cr 2 O 3 from cattle feces was checked. The recoveries of TiO 2 and Cr 2 O 3 were high enough at the 2.5 g Na 2 SO 4 level. Fourth, the improved dry ash procedure (5 mL of concentrated H 2 SO 4 and 2.5 g of Na 2 SO 4 were used for sample digestion) was compared to the wet ash procedure. Average recovery of TiO 2 by the improved dry ash procedure was significantly higher ( P = 0.0077) than that by the wet ash procedure. Thus, the improved dry ash procedure can be used for TiO 2 analysis in cattle feces containing Cr 2 O 3 .