Glutamic acid decomposition as a sensitive measure of heavy metal pollution in soil |
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| Authors: | L Haanstra P Doelman |
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| Institution: | Research Institute for Nature Management, Kemperbergerweg 67, 6816 RM Arnhem, The Netherlands |
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| Abstract: | The effect of added heavy metals (Cd, Cr, Cu, Ni, Pb and Zn) on the rate of decomposition of glutamic acid was studied in four Dutch soil types in order to determine if such measurements would serve as sensitive indicators of heavy metal pollution in soil. The time required to reach the maximum respiration rate (referred to as the decomposition time) with glutamic acid was linearly related to increasing concentrations of Ni in a sandy loam soil.Changes in decomposition time were measured 18 months after addition of 55, 400 or 1000 mg kg? of Cd, Cr, Cu, Ni, Pb or Zn respectively to sand, silty loam, clay and sandy peat soils. A significant increase in the decomposition time occurred with a concentration of 55 mg kg?1 of Cd, Cu or Zn in the sand soil. At 400mgkg?1 adverse effects in the various soils are distinct. The sensitivity of the decomposition time of glutamic acid as a method to measure soil pollution is discussed. |
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