The Applications Of Ion-imprinted Polymers And Eggshell Membrane Adsorbents In Analytical Chemistry

With the continuous development of analytical chemistry in recent year s, thedetermination of trace and ultra-trace levels of metal ion is become moreimportant by the advanced instruments, it is not only could detect the content of10-12levels, but also reduce analysis costs and work intensity when coupled tosample pretreatment techniques. But there is a problem that samples have becomemore complex and the content also become lower in daily analysis, it will be anunprecedented challenge in the analytical field. To improve the detectioncapability and selectivity of analytical methods, the separation andpre-concentration of trace levels of metal from the matrix samples is usuallynecessary prior to the final determination. The pro-concentration and analysis oftrace metal ions depend on appropriate separation methods and differentadsorption materials with excellent adsorption， higher selectivity and biggeradsorption. This paper mainly described several adsorption materials whichpossess high selectivity and adsorbing capacity to determine the trace heavy metalions in complex samples. At the same time, the adsorption selectivitycharacteristics for trace heavy metal ions have been investigated systematically.The more detailed of this research were carried out as following:1、In the present work, a new method using a micro-column packed with Sc-IIPsas a solid-phase extraction adsorbent was developed for the selectivepre-concentration and separation of trace amounts of scandium (III) prior to thedetermination by inductively coupled plasma mass spectrometry (ICP-MS).Various factors influencing the separation and pre-concentration of trace scandium,such as pH, sample flow rate, breakthrough volume, elution concentration andvolume were investigated in detail. Under the optimized condition，the detectionlimit of this method for Sc(III) was0.013ng mL-1in water，and0.46ng g-1ingeological sample, the relative standard deviation was3.2%(n=11, C=0.5μg L-1).The proposed method was validated by using certified reference materials and applied to the determination of trace scandium in geological samples andenvironmental water samples with satisfactory results.2、In this work, eggshell membrane (ESM), a solid phase extraction material，was used for Au (III) ions which determined by ICP-MS. Au(III) wasquantitatively separated and pre-concentrated in1.2mol L-1HCl at a sample flowrate of2.0mL min-1using the ESM micro-column system. Au(III) was retained onthe column packed with ESM was quantitatively eluted by5mL1.0%thiourea-1.0%HCl, Under the optimized condition，the maximum adsorption capacity forAu(III) is8.3mg g-1. The detection limits of this method for Au(III) was0.92ngL-1, and the relative standard deviation (RSD) under optimum conditions was0.83%(n=11，C=1.0μg L-1). The method was validated using certified referencematerials and applied to the determination of trace Au in geological samples withsatisfactory results.3、In this work, eggshell membrane (ESM), a solid phase extraction material,was used for Pb(II) ions which determined by GFAAS. Various factors influencingthe separation and pre-concentration of trace lead, such as pH, sample flow rate,breakthrough volume, elution concentration and volume were investigated indetail. The detection limits of this method for Pb (II) was0.017ng L-1, and therelative standard deviation (RSD) under optimum conditions was3.45%(n=11，C=5.0ng mL-1). The proposed method was applied to the determination of tracelead in environmental water samples with satisfactory results.