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以二乙烯三胺为改性剂,对硅胶进行表面修饰,制备了二乙烯三胺改性硅胶吸附材料,采用傅立叶红外光谱仪(IR)对其进行表征,用静态法考察了该吸附材料对痕量铜(Ⅱ)、镉(Ⅱ)的吸附性能。在p H 5.5,35℃下恒温振荡50 min,Cu2+,Cd2+能同时被吸附材料很好的吸附,吸附的Cu2+,Cd2+可用0.5 mol/L硫脲+0.2 mol/L HNO3完全洗脱。其静态饱和吸附容量分别为16.63,24.86 mg/g。对2.0 mg/L的Cu2+,Cd2+的标准溶液液进行11次测定,相对标准偏差分别为3.3%和1.5%,检出限(3σ,n=11)分别为5.90,3.77μg/L。加标回收率分别95%~101%和99%~104%。方法可用于实际矿样中痕量铜、镉的测定。
Diethylenetriamine was used as modifier to modify the surface of silica gel. Diethylenetriamine modified silica gel adsorbent was prepared and characterized by Fourier transform infrared spectroscopy (IR) Adsorption capacity of copper (Ⅱ) and cadmium (Ⅱ). When the temperature was kept constant at pH 5.5 and 35 ℃ for 50 min, Cu2 + and Cd2 + could be well adsorbed by the adsorbent at the same time. The adsorbed Cu2 + and Cd2 + could be completely eluted with 0.5 mol / L thiourea and 0.2 mol / L HNO3. The static saturated adsorption capacities were 16.63 and 24.86 mg / g, respectively. The standard solutions of 2.0 mg / L Cu2 + and Cd2 + were determined 11 times with relative standard deviations of 3.3% and 1.5% respectively. The detection limits (3σ, n = 11) were 5.90 and 3.77μg / L, respectively. Spiked recoveries were 95% ~ 101% and 99% ~ 104%. The method can be used for the determination of trace copper and cadmium in actual ore samples.