Photothermal deflection spectroscopy was applied to the selective detection of iron(II) chelate with ferrozine by its sorption preconcentration on Silufol plates. The linearity range was 1 &times 10<sup>−11</sup>−6 &times 10<sup>−8</sup> mol cm<sup>−2</sup> of chelate at the plate surface, which corresponded to 1 &times 10<sup>−9</sup>−4 &times 10<sup>−6</sup> M of chelate in solution. The limits of detection and quantification are 8 &times 10<sup>−12</sup> and 2.5 &times 10<sup>−11</sup> mol cm<sup>−2</sup> at the plate from 15 μL of test solution (0.5 nM and 1.5 nM in solution, respectively), and the absolute detection limit is 8 fmol in the whole spot applied to a plate. Characteristics and features of photothermal deflection detection are discussed.

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