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以火焰原子吸收光谱法(FAAS)为检测手段,研究了聚丙烯腈微球(PANMS)对溶液中Cu2+的吸附及其影响因素,并建立了PANMS分离富集-FAAS法。实验结果表明,溶液pH为5、静态吸附时间为1.5 h、温度为20℃时,其对Cu2+的吸附达到饱和而稳定,吸附容量为30.2 mg/g,吸附率可达到87.5%。随着吸附时间的延长吸附率有所提高,但幅度不是很大。以0.1 mol/LHC l溶液作为解吸剂,解吸率可达到96.5%。经富集50倍后,测Cu2+工作曲线的回归方程为A=0.0025C(μg/L)-0.0026(r=0.9993),方法的检出限为1.68μg/L,相对标准偏差(RSD)小于2.9%。加标回收率为91.4%~97.0%。
Flame atomic absorption spectrometry (FAAS) was used as a detection method to investigate the adsorption of Cu2 + by polyacrylonitrile microspheres (PANMS) and its influencing factors, and the PANAS separation and concentration-FAAS method was established. The experimental results showed that the adsorption of Cu2 + was saturated and stable at a pH of 5 with a static adsorption time of 1.5 h and a temperature of 20 ℃. The adsorption capacity was 30.2 mg / g and the adsorption rate was 87.5%. With the extension of adsorption time adsorption rate has increased, but the magnitude is not great. With 0.1 mol / L HCl solution as desorbent, the desorption rate can reach 96.5%. After 50-fold enrichment, the regression equation of Cu2 + working curve was A = 0.0025C (μg / L) -0.0026 (r = 0.9993). The detection limit was 1.68μg / L and the relative standard deviation (RSD) 2.9%. Spiked recoveries ranged from 91.4% to 97.0%.