FAAS法研究顺丁烯二酸-co-苯乙烯微球对铅的吸附性能

采用无皂乳液聚合法以顺丁烯二酸和苯乙烯交联合成顺丁烯二酸-co-苯乙烯微球并采用傅里叶变换红外光谱和电子扫描电镜对微球的结构和表面形貌进行表征。以火焰原子吸收光谱(FAAS)法研究了它对铅的动态吸附性能,考察了影响吸附率和解吸率的相关因素,结果表明:溶液pH为5、上样流速为1.0mL.min-1时,吸附率可达到95%以上。以1mol.L-1 HNO3为解吸剂,洗脱液流速为0.5mL.min-1时,Pb(Ⅱ)的解吸率可达到99%以上。在优化的试验条件下,微球对Pb(Ⅱ)的吸附量可达到26.5mg.g-1,检出限为(3σ11)2.1μg.L-1,相对标准偏差为2.5%;将预富集与火焰原子吸收法联用,用于痕量铅的测定得到令人满意的结果。

Study on the adsorption behavior of beads of maleic anhydride-co-styrene to Pb(II) by FAAS

The crosslinked polymer beads was synthesized by free emulsion polymerization using maleic anhydride and styrene. The chemical structure and morphology of the polymer beads were analyzed using FTIR and SEM. And the dynamic adsorption properties of beads for Pb(II) was studied by atomic adsorption spectrometry(AAS). The relevant factors influencing adsorption and desorption were investigated. The results showed that in the solution at pH 5, when the sample flow rate was 1.0 mL x min(-1), the adsorption rate of Pb(II) reached more than 95%. Using 1 moL x L(-1) nitrate acid as the best eluant the absorbates were desorbed at the flow rate of 0.5 mL x min(-1), the recovery of Pb(II) reached more than 99%. Under the optimum conditions, the adsorption capacity could be up to 26.5 mg x g(-1), the detection limits(3sigma11) were 2.1 microg x L(-1) and relative standard deviation (RSD) was 2.5%. The method has been applied to the determination of trace lead in water samples with satisfactory results.