Effects of Adding Charcoal During Dilute Acid Extraction of Manganese from Soils

Submitted by Erin Rasmussen on

Publication Type:

Journal Article

Authors:

Gilliam, J. W.; Cox, F. R.; Reid, P. H.

Source:

Soil Sci. Soc. Am. J., Volume 32, Number 4, p.511-514 (1968)

URL:

http://soil.scijournals.org/cgi/content/abstract/32/4/511

Abstract:

Addition of charcoal during extraction of soil with dilute HCl + H2SO4 increased the amounts of manganese and iron extracted but had little or no effect on the copper, zinc, and aluminum extracted concurrently. Experiments indicated that the increase in extractable manganese due to the presence of charcoal was not a consequence of an increase in efficiency of extraction of reduced manganese already present but resulted from a reaction in which forms of manganese of low solubility were reduced and made soluble and in which CO2 and CO were evolved. The amounts of manganese extracted from soils by dilute HCl + H2SO4 in the presence of charcoal and by dilute HCl + H2SO4 containing hydroquinone were highly correlated. The effect due to charcoal increased with the acidity of the extracting solution, the time of extraction, and the amount of charcoal added.