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在pH 6.2的Na2HPO4-柠檬酸缓冲溶液、水浴60℃条件下,纳米银粒子催化水合肼(N2H4)还原氯金酸(HAuCl4),Au3+被还原成单质金并吸附在金纳米表面,在370nm处有一个较强的共振瑞利散射(RRS)峰。随着N2H4浓度的增大,生成的单质金越多,金纳米的粒径也逐渐增大,使得体系370nm处的共振瑞利散射峰线性强度增大,从而构建纳米银催化RRS分析平台并用于检测N2H4。在选定条件下,N2H4的浓度在0.012 5~3.5μmol/L范围内与共振散射峰强度增加值ΔI呈现良好线性关系,线性方程为ΔIRS=1 297.8C+228.78,检出限为0.006μmol/L N2H4,该法测定了水样中的N2H4,结果令人满意。
In pH 6.2 Na2HPO4-citric acid buffer solution, water bath at 60 ℃, silver nanoparticles catalytic hydrazine hydrate (N2H4) reduction of chlorauric acid (HAuCl4), Au3 + is reduced to elemental gold and adsorbed on gold nanometer surface at 370nm There is a strong Resonance Rayleigh scattering (RRS) peak. With the increase of the concentration of N2H4, the more elemental gold formed and the particle size of gold nanoparticles gradually increased, the linear intensity of the resonance Rayleigh scattering peak at 370 nm of the system was increased, and thus a nano-silver-catalyzed RRS analysis platform was constructed and used N2H4 detection. Under the selected conditions, the concentration of N2H4 showed a good linear relationship with the increase of resonance scattering intensity ΔI in the range of 0.012 5 ~ 3.5μmol / L, the linear equation was ΔIRS = 1 297.8C + 228.78 with the detection limit of 0.006μmol / L N2H4, the method for the determination of N2H4 in water samples, the results are satisfactory.