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在pH5.0 NaAc-HAc介质和吐温80溶液中,研究了Zn(SCN)42-与结晶紫形成的离子缔合微粒的共振散射光谱,考察了其各种影响因素和适宜的反应条件,确定了共振散射强度与Zn2+浓度的关系,建立了测定痕量Zn(Ⅱ)的共振散射新方法。研究表明,在0.020～0.80μg/mL范围内,体系的共振散射强度ΔI与Zn2+浓度之间有较好的线性关系,其检出限为8.35×10-3μg/L。该方法用于测定补锌药品及营养盐中痕量锌,回收率为94.8%～98.3%,RSD为1.1%～1.2%。
The resonance scattering spectra of Zn (SCN) 42- and crystal violet ion-association particles were studied in pH 5.0 NaAc-HAc media and Tween 80 solution. Various influencing factors and suitable reaction conditions were investigated. The relationship between resonance scattering intensity and Zn2 + concentration was determined, and a new method for the determination of trace Zn (Ⅱ) by resonance scattering was established. The results show that there is a good linear relationship between the resonance scattering intensity ΔI and Zn2 + concentration in the range of 0.020 ~ 0.80μg / mL, and the detection limit is 8.35 × 10-3μg / L. The method was applied to the determination of trace zinc in zinc supplements and nutrients. The recoveries ranged from 94.8% to 98.3% with RSD ranging from 1.1% to 1.2%.