Abstract

GARCIA GALVIS, Johnbrynner  and  BALLESTEROS, María Inés. QUALITY PARAMETERS EVALUATION FOR THE DETERMINATION OF AVAILABLE PHOSPHOROUES IN SOILS. Rev.Colomb.Quim. [online]. 2006, vol.35, n.1, pp.81-89. ISSN 0120-2804.

There are some colorimetric procedures for determining available phosphorous in soils, and phosphorous is evaluated by means of a blue complex (phosphomolibdic acid); in one of the methods, color appear when ascorbic acid is used as reductor agent, and in the other when stannous chloride is used. Both methods use the same extractive solution Bray II due to its good response for acid soil cultures, like most Colombian soils are. When the two methodologies were compared it was found that the most sensible method and with the best limit of detection and quantification was the one that uses ascorbic acid, antimonioum and potassium tartrate. Its variation coefficients and standard deviation were lower, and for this reason it is considered as the most precise method for phosphorous determination.

Keywords : Available phosphorous; soils; Bray II; Quality parameters.

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