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9 pg/mL, which is more sensitive than previously reported methods.In this paper, a novel fluorescence assay has been constructed for the determination of parathion-methyl (PM) by using 4-amino-3-hydroxy-1-naphthalenesulfonic acid (AHNSA) as probe. MnO2 nanosheets (MnO2 NS) could quench the fluorescence of AHNSA, while Mn2+, the reduction product of MnO2 NS, has no influence on it, resulting in fluorescence recovery. This is because that MnO2 NS have oxidized characteristic, and they can react with choline (TCh), which is the product of
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