Hydrochloric acid dysprosium

Some nut trees accumulate mineral elements. Hickory nut is notable as an accumulator of aluminum compounds (30) the ash of its leaves contains up to 37.5% of AI2O2, compared with only 0.032% of aluminum oxide in the ash of the Fnglish walnut s autumn leaves. As an accumulator of rare-earth elements, hickory greatly exceeds all other plants their leaves show up to 2296 ppm of rare earths (scandium, yttrium, lanthanum, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium). The amounts of rare-earth elements found in parts of the hickory nut are kernels, at 5 ppm shells, at 7 ppm and shucks, at 17 ppm. The kernel of the Bra2d nut contains large amounts of barium in an insoluble form when the nut is eaten, barium dissolves in the hydrochloric acid of the stomach. 

Another hepatocyte-specific contrast formulation, dysprosium ethoxybenzyltris(carboxylatomethyl)triazaun-decanedioic acid diethylenetriaminepenta-acetic acid (Dy-EOB-DTPA), has been used for Uver CT imaging (266). It contains calcium-EOB-DTPA (0.5 mg/ml), tro-metamol (1.2 mg/ml), and hydrochloric acid (final pH 7.4). It has been described as a stable metal chelate with high tolerability in vitro and in animal studies, in which a long-lasting increase in CT density of about 30 Hounsfield units has been reported. A total of 40 healthy male volunteers (mean age 33 years) received intravenous infusions... 

Dysprosium is relatively unreactive at room temperatures. It does not oxidize very rapidly when exposed to the air. It does react with both dilute and concentrated acids, however. For example, it reacts with hydrochloric acid to form dysprosium trichloride. 

Obtained in two steps First, a mixture of 3-hydroxy-acetophenone and dysprosium nitrate in ethyl acetate were refluxed (85-105°) for 75 min. Then, the isolated intermediate (CgHgNO )3Dy (59%) was dissolved in 6 N hydrochloric acid (50%) [2095]. 

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