IO3--I3--吖啶红体系的共振散射光谱研究及应用

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。

Spectral Study of Acridine Red Association Particle System and Its Application to Determination of Trace IO3-

Under the conditions of HCl-KI,acridine red (AR) has a max absorption peak at 540 nm,the max absorption peak of acridine orange (AO) at 480 nm. There is a fluorescence peak at 550 nm for AR and at 520nm for AO. When there is IO3-,it reacts with excessive I- to form I3-. The two dyes and I3- all combine to form an association particle, respectively. To the systems of AR,it exhibits a strong resonance scattering (RS) peak at 605 nm. IO3- concentration in 1. 0× 10-7～4. 0× 10-6 mol/L is proportional to the resonance scattering peak at 605 nm. There is hypochromic effect at absorption wavelength of 540 nm,and fluorescence quenching at 550 nm. To the systems of AO,the RS peak at 560 nm is most sensitive with IO3- concentration in 2. 0× 10-7～1.2× 10-5 mol/L. The system of AR is applied to the determination of IO3- in table salt.