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- W2026981537 abstract "Co-extracted ions with ATP from soils may interfere with ATP luciferin–luciferase luminescence reaction when ATP is assayed. The effects were investigated in a typical concentration range of cations and anions potentially extractable in soils. A commercial ATP assay product (Sigma Chemical Co.) was used. Significant quenching is evidenced from a concentration of 0.10 mM with Cu 2+ and Zn 2+ , and 1.00 mM with Ca 2+ . The order of quenching at 1.00 mM was: Cu 2+ >Zn 2+ >Ca 2+ =Na + =Mg 2+ , while Mg 2+ =Mn 2+ , both Ca 2+ and Na + >Mn 2+ . The quenching was found to be much more severe with selected special heavy metal cations with quenching in the order: Ti 3+ >Hg 2+ >Cr 3+ . Because cation quenching can be alleviated by addition of EDTA, three forms of EDTA (Mg, Na and acid EDTA) were tested for their suitability for the assay. The Mg-EDTA was found superior to the other two. Presence of PO 4 3− at concentrations of 0.01 and 0.05 mM, and NO 3 − at 0.01 and 0.10 mM, significantly enhanced ATP light emission (8–13%). However, SO 4 2− at similar concentrations significantly decreased light emission. The quenching by CO 3 2− and Cl − was only observed at high concentrations (3.20 mM and up). The order of quenching for the anions at a concentration of 6.4 mM was: PO 4 3− >CO 3 2− >SO 4 2− >NO 3 − >Cl − . Enhanced or depressed light emission induced by ions would produce significant over or underestimation of soil ATP. While addition of Mg-EDTA may alleviate cation quenching, the interference from anions may require the ATP assay standards be prepared in a solution of similar chemical composition to that in soil ATP extracts." @default.
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- W2026981537 date "2001-01-01" @default.
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- W2026981537 title "Assessment of ionic quenching on soil ATP bioluminescence reaction" @default.
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- W2026981537 doi "https://doi.org/10.1016/s0038-0717(00)00104-8" @default.
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