Nanochemistry Department, Research Institute of Environmental Sciences, International Center for Science, High Technology & Environmental Sciences, Kerman, Iran.
J Hazard Mater. 2010 Sep 15;181(1-3):957-61. doi: 10.1016/j.jhazmat.2010.05.106. Epub 2010 Jun 1.
In this work, the applicability of modified organo nanoclay as a new and easy prepared solid sorbent for the preconcentration of trace amounts of Au(III) ion from water samples is studied. The organo nanoclay was modified with 5-(4'-dimethylamino benzyliden)-rhodanine and used as a sorbent for separation of Au(III) ions. The sorption of gold ions was quantitative in the pH range of 2.0-6.0. Quantitative desorption occurred with 6.0 mL of 1.0 mol L(-1) Na(2)S(2)O(3). The amount of eluted Au(III) was measured using flame atomic absorption spectrometry. In the initial solution the linear dynamic range was in the range of 0.45 ng mL(-1) to 10.0 microg mL(-1), the detection limit was 0.1 ng mL(-1) and the preconcentration factor was 105. Also, the relative standard deviation was +/-2.3% (n=8 and C=2.0 microg mL(-1)) and the maximum capacity of the sorbent was 3.9 mg of Au(III) per gram of modified organo nanoclay. The influences of the experimental parameters including sample pH, eluent volume and eluent type, sample volume, and interference of some ions on the recoveries of the gold ion were investigated. The proposed method was applied for preconcentration and determination of gold in different samples.
在这项工作中，研究了用 5-(4'-二甲氨基苯亚甲基）-罗丹宁修饰的有机纳米粘土作为一种新的、易于制备的固体吸附剂，用于从水样中预浓缩痕量的 Au(III)离子。将有机纳米粘土用 5-(4'-二甲氨基苯亚甲基）-罗丹宁修饰，用作分离 Au(III)离子的吸附剂。Au(III)离子的吸附在 pH 值为 2.0-6.0 的范围内是定量的。用 6.0 mL 1.0 mol L(-1)的 Na(2)S(2)O(3)可以定量洗脱 Au(III)。用火焰原子吸收光谱法测量洗脱的 Au(III)量。在初始溶液中，线性动态范围为 0.45 ng mL(-1)至 10.0 microg mL(-1)，检测限为 0.1 ng mL(-1)，预浓缩因子为 105。此外，相对标准偏差为 +/-2.3%（n=8，C=2.0 microg mL(-1)），吸附剂的最大容量为每克改性有机纳米粘土 3.9 mg 的 Au(III)。研究了实验参数对金离子回收率的影响，包括样品 pH 值、洗脱液体积和洗脱液类型、样品体积以及一些离子的干扰。该方法已应用于不同样品中金的预浓缩和测定。
