Synthesis of 4-nitroazobenzenesalicylidene fluorescence ketone and complexation fluorometry for the determination of Sn (IV)

In this experiment, the novel color developing agent 4-nitroazobenzenesalicylidene fluorescence ketone was used as raw material to determine Sn(IV) by coordination fluorescence method. At the maximum excitation and emission wavelengths (λ_ex/λ_em = 455 nm/552 nm), the Sn(IV) concentration in the range of 1.50–3.50 µg/mL showed a good linear relationship with the relative fluorescence intensity. The optimum experimental conditions and possible reaction mechanism were studied. The linear regression equation is ΔF = 83.4032–19.7658ρ(µg/mL), r = 0.9992. The detection limit was 0.0771 µg/mL and K_a = 3.66 × 10⁴ M⁻¹. After shielding the interfering ions, trace amounts of Sn(IV) were detected in synthetic water samples, laboratory wastewater, and canned asparagus. The recoveries were 101.64%, 99.42% and 103.48%, respectively. Satisfactory results were obtained.