Ghaedi M, Montazerozohori M, Soylak M
Chemistry Department, University of Yasouj, Yasouj 75914-353, Iran.
J Hazard Mater. 2007 Apr 2;142(1-2):368-73. doi: 10.1016/j.jhazmat.2006.08.033. Epub 2006 Aug 22.
A sensitive and selective extractive preconcentration procedure for the determination of traces of lead in water samples has been developed. An alumina-sodium dodecyl sulfate (SDS) coated modified with 4-(4-methoxybenzylidenimine) thiophenole (MBITP) was used for preconcentration and determination of Pb(II) by flame atomic absorption spectrometry. Lead was adsorbed quantitatively on modified column due to its complexation with MBITP and quantitatively eluted using 5 mL 1 mol L(-1) nitric acid in acetone. The effects of parameters such as pH, amount of solid phase, amount of MBITP, flow rate, type and concentration of eluting agent were examined. The effect of interfering ions on the determination of Pb(II) was also investigated. The response of proposed method is linear in the concentration range 0.05-1.2 microg mL(-1) of Pb(II). The limit of detections (3S.D.(b)/m, n=4) and relative standard deviations (n=11) are 1.6 ng mL(-1) and 0.9%, respectively. The presented procedure was successfully applied for determination of lead content in real samples such as river, spring, waste and drinking water.
已开发出一种灵敏且选择性的萃取预富集方法，用于测定水样中的痕量铅。使用经4-(4-甲氧基苄叉亚胺)硫酚(MBITP)修饰的氧化铝-十二烷基硫酸钠(SDS)对铅进行预富集，并通过火焰原子吸收光谱法测定Pb(II)。由于铅与MBITP络合，其在修饰柱上被定量吸附，并用5 mL 1 mol L(-1)硝酸丙酮溶液进行定量洗脱。考察了pH值、固相量、MBITP量、流速、洗脱剂类型和浓度等参数的影响。还研究了干扰离子对Pb(II)测定的影响。所提方法在0.05 - 1.2 μg mL(-1)的Pb(II)浓度范围内呈线性响应。检测限(3S.D.(b)/m, n = 4)和相对标准偏差(n = 11)分别为1.6 ng mL(-1)和0.9%。该方法成功应用于河水、泉水、废水和饮用水等实际样品中铅含量的测定。
