微肥中锌的双硫腙螯合微粒共振散射光谱分析

Resonance Scattering Determination of Zinc in Microelement Fertilizer Based on the Formation of Dithizone Complex Particles

摘要: 在pH9.0的NH₃-NH₄Cl缓冲溶液中,Zn(Ⅱ)与双硫腙可形成能稳定存在的螯合物微粒,显示出共振散射效应.该微粒体系的最强共振散射峰在605nm处,锌的浓度在0.02～1.54μg/mL范围内与共振散射强度(I_605nm)呈线性关系,检出限为0.008μg/mLZn.利用共振散射测量微肥中微量元素锌,方法简单、灵敏度高、重现性好,结果满意.

Abstract: In pH 9.0 H₃-NH₄Cl buffer solution, Zn(Ⅱ) and dithizone combine to stable complex particles, which exhibit resonance scattering effect at 605 nm. The scattering intensity at 605 nm is linear to Zn concentration in the range of 0.02~1.54 μg/mL. The detection limit is 0.008 μg/mL Zn. This method has been applied to determination of Zn in microelement fertilizer, with sensitivity, simplicity, reproducibility and satisfactory results.