PROBLEMS ASSOCIATED WITH EXTRACTING Fe AND Al FROM SASKATCHEWAN SOILS BY PYROPHOSPHATE AND LOW SPEED CENTRIFUGATION

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Abstract
Atomic absorption analyses of pyrophosphate extractions of B horizons from some Luvisolic, Gleysolic and Solods had higher Fe and Al contents when using 0.1% Superfloc and low speed centrifugation than those obtained when using 0.2% or 0.5% Superfloc or when using high speed centrifugation. Laboratories not equipped with a high speed centrifuge should use a method other than Superfloc to clarify the solution or use the recommended colorimetric method.