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A high-sensitivity fluorescence immunoassay for atrazine was established. It is making use of hydrophilic NaYF4:Yb/Er upconversion nanoparticles (UCNPs) conjugated to the anti-atrazine antibody as signal probe, and of polystyrene magnetic microspheres (PMMs) conjugated to the coating antigen as the capture probe. The coating antigen on the capture probe competes with atrazine for binding to the antibody...
. The chemiluminescence (CL) system K2MnO4-luminol is shown to be useful for the determination of lead(II). The method is based on the catalytic effect of Pb(II) on the CL reaction. The linear range was 3 × 10−3–9 × 10−1 mg L−1 (r = 0.9971) and the relative standard deviation (R.S.D.) for 5 × 10−2 mg L−1 Pb(II) measurement was 0.7% (n = 11). The detection limit was 3 × 10−4 mg L−1 (3σ) Pb(II). Based...
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