African Music in Ghana

Cr20,2-+ 14H' MnOp + 4H' + EO = +1.52 volts (1) EO = +1.33 volts (2) Eo = +123 volts (3)Fe3+ + e e Fez+ Eo 5 +0.77 volts (5)Thus, there is no problem of any interference from Mn2+ or C r s which are in general present in rocks in small amounts (Mn from 0.05 to 0.2%, Cr from 1 to 4000 ppm). The presence of an appreciable amount of "acid decomposable sulfide" invalidates the ferrous iron determination. Pyrite is not appreciably attacked by mixture of HF and HC1 but other sulfides, such as pyrrhotite, are more extensively decomposed liberating hydrogen sulfide which will result in higher values of ferrous iron. Organic matter other than graphite will completely invalidate the meth- od.The relative 70 deviation has been calculated on the amounts present. CONCLUSIONSFerrous iron can be determined by the iodine monochloride method without any possible aerial oxidation and without any interference from manganese or chromium. Ferrous iron in carbonate and other acid decomposable rocks (which are attacked by HCl or HCl and HF) can also be determined. Acid decomposable sulfides and organic matter other than graphite invalidate the method.

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“…In comparison to previously published data (7, 8), these results are equal to or better than those reported for the larger Fast Analyzers.…”

Section: Resui Precision and A Marized Insupporting

confidence: 63%