Conc.Ref. Empty Cell Empty Cellppm Empty Cell Canada Waterbury and Cigar Lakes, Saskatchewan 0.088 [122] Brazil Osamu Utsumi Mine 0.019 [123] Morro do Ferro 0.002 [123] Finland Olkiluoto 3.0 [120] 4.2 [124] 12.4 [125] 0.6 [126] 0.1 [127] 1.8 [128] Romuvaara 0.85 [129] Japan ...
Bauxite samples (0.5-1 g) are treated by heating with a mixture of 5 ml of HNO3 (conc.), 10 ml of HC1 (conc.) and 10 ml of H2SO~ (conc.). The insoluble residue is hydrofluorized, fused with KHSO4, taken up with 2 N H2SO4 and added to the main solution. Hematite samples ...
About 10 ml 0.5 M NH4NO3 was added as a stabilizing agent, while 2 ml conc. nitric acid was also added to the solution to ensure the complete solubility of salts by adjusting the pH at 3. The obtained films were rinsed with deionized water, absolute ethanol, and put in a vacuum drying...
The detection limit of Cu(II) was obtained using a correlation plot of Ao-An/Ao against conc. of Cu(II) ions (Fig. 3), where absorbance maxima with subsequent addition of Cu(II) ions is An, and of 2,3 H2bitsc is Ao at 0.2 mM [56]. Detection limit of Cu(II) in complex 1 ...
1:0.5-1. The dicarboxylic acids are recovered by cooling and filtration, and the remaining HNO3 can be conc. and used again. The dicarboxylic acid mixt. can be sepd. by distn. at 150 Torr and reflux ratio 3:1, succinic acid or anhydrides is obtd. as distillate, leaving a residue ...
HF and conc. HCl; (c) pickling in HNO3, esp. a 50% soln. of HNO3; (d) activating the surface of the workpiece while simultaneously providing a thin, adherent Cu coating, via an aq. soln. contg. 20-400 g/l of a Cu salt, 5-100 g/l of an alkli- or ammonium- fluoride, and...
Direct at. absorption spectrometric detn. of Zn, Fe, Sn, and Cu in black currant juice and conc.; and in mead by the std. addn. method had an error of 1-7% depending on the metal concn., whereas the error of detn. with a previous sample mineralization with ...
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