摘要
采用火焰原子吸收光谱法(FAAS)研究了交联聚丙烯腈螯合树脂对环境样品中Pb2+的吸附分离/富集行为,并考察了共存离子的干扰。结果表明,该树脂对Pb2+的吸附率在溶液pH=5.4、静态吸附时间1.5 h时室温下可达90%。在最佳吸附条件下,树脂对单一Pb2+的饱和吸附容量可达49.6 mg/g。以0.1 mol/L盐酸溶液作为解吸剂,可将吸附在树脂上的Pb2+定量洗脱,富集倍数和解吸率可分别达到50和97%。富集50倍后,方法的检出限(3σ10)为5.3μg/L;相对标准偏差(RSD)为2.1%;加标回收率为92.9%～97.6%。
A new method for the determination of Pb2＋ in environmental water sample using crosslinked polyacrylonitrile as a solid-phase extractant and flame atomic absorption spectrometry（FAAS） as a sensitive detector has been developed.The adsorption of Pb2＋ by crossslinked polyacrylonitrile and factors affecting the adsorption capacity were studied by AAS.The experimental results showed that at optimal adsorption conditions,e.g.,pH of adsorbate solution was 5.4,static adsorption time was 1.5 h and adsorption procedure was carried at room temperature,polyacrylonitrile as adsorbent has high adsorption capacity for Pb2＋ which can reach 49.6 mg/g.Adsorption rate was 90% during the 1.5 h static adsorption time.Using 0.10 mol/L chloride acid as the desorption solvent to desorb the adsorbates,the enrichment factor and the recovery were 50 times and 97% respectively.Under enrichment factor of 50 times,the detection limits（3σ） was 5.3 μg/L and the relative standard deviation（RSD） was 2.1%.The established method was extended to the determination of environmental samples and the results were satisfactory（recovery was 92.9%～97.6%）.These results indicate that the polymer has good regenerate capability.
出处
《应用化学》
CAS
CSCD
北大核心
2011年第9期1082-1086,共5页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金(20674066)资助项目
