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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。
The soap-free emulsion polymerization was used to synthesize maleic acid-co-styrene microspheres with maleic acid and styrene. The structure and surface morphology of the microspheres were characterized by Fourier transform infrared spectroscopy and electron scanning electron microscopy Appearance to characterize. The FAAS method was used to study the dynamic adsorption of lead on Pb. The factors influencing the adsorption rate and desorption rate were investigated. The results showed that when the solution pH was 5 and the sample flow rate was 1.0mL.min-1 , Adsorption rate can reach more than 95%. When 1mol.L-1 HNO3 was used as desorbent, the desorption rate of Pb (Ⅱ) could reach more than 99% when the eluent flow rate was 0.5mL.min-1. Under optimal experimental conditions, the adsorption capacity of Pb (Ⅱ) on the microspheres reached 26.5mg.g-1 with the detection limit of (3σ11) 2.1μg.L-1 and the relative standard deviation of 2.5% Set with flame atomic absorption method for the determination of trace amounts of lead obtained satisfactory results.