纳米金共振散光谱探针测定钼

Nanogold Resonance Scattering Spectral Probe forthe Determination of Molybdenum

摘要: 在0.45 mol/L硫酸-0.026 mol/L硫脲-0.32 mol/L KSCN介质中，粒径为70 nm的纳米金的共振散射信号较弱, Mo(Ⅵ) 被硫脲还原为Mo(Ⅴ)，Mo(Ⅴ)与硫氰酸钾生成橙红色配合物MoO(SCN)₅^2-. 该配合物与纳米金探针作用，导致402和554 nm共振散射峰增强.钼浓度在1.0~20×10^-6 mol/L范围内与402 nm波长的共振散射光强度成线性关系，方法的检出限为5.1×10^-7 mol/L Mo.该法用于废水中钼的测定，结果满意.

Abstract: In sulfuric acid-thiourea-potassium thiocyanate medium, nanogold in size of 70 nm exhibit weak resonance scattering signal. Mo(Ⅵ) is reduced to Mo(Ⅴ) by thiourea, and Mo(Ⅴ) reacts with potassium thiocyanate to form a orange-red complex . When the complex coexists with gold nanoparticles, there are two resonance scattering peaks at 402 nm and 554 nm respectively. Mo(Ⅴ) concentration in the range of 1.0~20×10^-6mol/L is proportional to the enhanced resonance scattering intensity at 402 nm, with detection limit of 5.10×10^-7 mol/L Mo. This method was applied to determination of Mo in waste water, with satisfactory results.