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在过量的I-存在的稀盐酸介质中,当有IO3-存在时,IO3-与过量的I-反应生成I3-,I3-与吖啶红、吖啶橙染料均可形成离子缔合微粒。吖啶红、吖啶橙分别在540、480 nm有较强吸收峰,在550、520 nm有较强荧光峰,吖啶红体系在605 nm处产生1个较强的共振散射(RS)峰,IO3-浓度在1.0×10-7~4.0×10-6mol/L与605nm波长处的共振散射光强度成线性关系。吖啶橙体系在560 nm处产生1个较强的共振散射(RS)峰,碘酸根浓度在2.0×10-7~1.2×10-5mol/L与560 nm波长处的共振散射光强度成线性关系。据此建立测定食盐中碘酸根的一种共振散射光谱法。采用此体系测定食盐中碘酸根,结果满意。
In an excess of I-present dilute hydrochloric acid medium, IO3- is present in excess of I3- in the presence of IO3- to form I3-, I3- and acridine red, acridine orange dyes can form ion-association particles. Acridine red and Acridine orange had strong absorption peaks at 540 and 480 nm respectively and strong fluorescence peaks at 550 and 520 nm. The acridine red system produced a strong resonance scattering peak (RS) at 605 nm , IO3- concentration in the 1.0 × 10-7 ~ 4.0 × 10-6mol / L and 605nm wavelength resonance scattering light intensity linear relationship. The acridine orange system produced a strong resonance scattering peak (RS) at 560 nm. The intensity of resonant scattering light with the iodate concentration of 2.0 × 10-7 ~ 1.2 × 10-5 mol / L and 560 nm was linear relationship. Based on this, a resonance scattering method was established for the determination of iodate in common salt. Using this system to determine iodate in salt, the result is satisfactory.