Spectrophotometric study of the beryllium-thorin complex and its application to the determination of beryllium in alloys

Nonferrous Metallurgy

“…Antimony was determined bromatometrieally after separation by reduction with Na2S204 Beryllium. Athavale et al (4) reported a spectrophotometric determination of 1 to 100 fig. of beryllium in copper-, zinc-, or aluminum-base and ferrous alloys containing 0.05 to 2% beryllium by complexing other metal ions with EDTA, extracting beryllium acetylacetonate into CCI4 at pH 7 to 8, decomposing the chelate, and measuring the absorbance of the 1 to 1 berylliumthorin complex at 470 mft and pH 12.…”

“…The extract was washed with KCN to remove copper and nickel and the aluminum and iron were determined by measuring the absorbance at 390 and 470 mg. Two micrograms of aluminum and 5 pg. of iron in 4 grams of magnesium can be determined, with only titanium interfering with the aluminum determination.…”

Extraction

“…Ruthenium may be extracted and photometrically determined in acetylacetonechloroform (58). Beryllium may be extracted from its alloys into carbon tetrachloride with acetylacetone from solutions at pH 7 to 8 (21).…”

“…Alkyl Phosphonates [(RO)2R'PO], A systematic thermodynamic study of the extraction of U02(N03)2 and HN03 by 21 compounds of the types (RO)3PO and (RO)2PRO show an increase of U and HNO3 extractability as the substituents on the P atom became less electronegative (i.e., the extractant became more basic) (476). Similar conclusions can be drawn from the fact that HNO3 is extracted progressively better from TBP, (C4H90)2C4H9P0, (C4H90) (C4H9)2PO, and tributylphosphine oxide (363,364,397).…”