Copper continued retention

The trimethylsilylated silicic acids formed in this instance are soluble in conventional organic solvents, and their volatility is sufficiently high for them to be analysed by gas chromatography. Carzo and Hoebbel [411] carried out a comprehensive study of the chromatographic retention of various trimethylsilylated silicic acids on different stationary phases Apiezon L and silicone OV-1 and OV-17. The analysis of metals in the form of volatile complexes continues to attract attention, and have been described for analysing sodium [412], potassium [412], radium [413], caesium [413], barium [414], calcium [414], strontium [415], beryllium [416, 417], magnesium [418], zinc [419, 420], nickel [419], mercury [421], copper [422, 423], silver [424, 425], cadmium [421], indium [426, 427], g ium [428], scandium [217], cobalt [421], thallium [426], hafnium [429, 430], lead [431, 432], titanium [430], vanadium [433], chromium [434-436], manganese [426], iron [437], yttrium [438], platinum [439,440], palladium [439, 441, 442], zirconium [430], molybdenum [443], ruthenium [444], rhodium [445], rare earths [446—449], thorium [221, 450, 451] and uranium [221, 452]. The literature on GC analysis of metal chelates was reviewed by Sokolov [458]. 

SP (Vis) Copper(II) contained on a solid-phase reactor was reduced by AA, and then detected as its chelate produced with bathocuproine. X - 480 nm SP (Vis) Fe(III) was reduced by AA, and then determined by using ferrozine as chromogenic reagent. X = 562 nm SP (Vis) Fe(III) contained on a solid-phase reactor was reduced by AA, and then detected as its chelate produced with 1,10-phenanthroline. A, = 510 nm SP (UV) A column packed with modified silica was used for interfering retention. X = 265 nm SP (UV) AA was determined by a continuous flow-through solid-phase spectrophotometry. The system was based on the measurement of its intrinsic absorbance at 261 nm when retained on a Sephadex QAE A-25 anion exchanger gel layer... 

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