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Influence of Vanadium on Soil Phosphatase Activity¹

ABSTRACT

Acid phosphatase activity of an organic soil (spruce needle mor) from southern Sweden was significantly reduced by vanadium in concentrations occurring in urban and suburban areas and due largely to fuel oil combustion. The inhibiting power of different forms of added vanadium (100 mg/kg dry weight) decreased in the order Na₃VO₄ > NaVO₃, VOSO₄ > V₂O₅. Na₂SO₄ and NaCl did not influence the activity. Above 100 mg/kg dry weight, phosphatase activity was inversely proportional to the logarithm of the added NaVO₃ concentration.

Key Words: enzyme • inhibition

¹ The work was financially supported by the Nat. Swed. Environ. Protect. Board and the Univ. of Lund.

² Assistant Professor, Dep. of Plant Ecology, University of Lund, Ö. Vallgatan 14, S-22361, Lund, Sweden.

Received for publication February 20, 1974.