制备2-乙酰基噻唑缩均氨基硫脲席夫碱键合硅球(ATTCH-SG)固相萃取材料,研究它对Hg2+的吸附作用,探讨溶液的pH、上样流速、洗脱液浓度及不同金属离子对Hg2+的定量回收的影响.试验表明,其吸附的最佳pH为6.0,用1 g/L硫脲和0.1 mol/L盐酸的混合液可以将Hg2+快速完全的洗脱下来.该法用于水和食品中Hg2+的分离富集,回收率在91%以上,检出限为0.0146μg/L,浓度为0.5μg/L的汞标准溶液11次平行测定的RSD为3.2%.%2-acetyl thiazole-thiocarbohydrazide Schiff base was immobilized on the surface of silica gel to prepare a new solid phase(ATTCH-SG). Analytical characteristics of the Schiff base modified silica gel have been investigated. The optimization of some analytical parameters affecting the recovery of the Hg 2+such as acidity, sample flow rate, eluent condition, and influence of potentially interfering ions were investigated. The optimum pH is 6, quantitative recovery(≥91%) of Hg2+was achieved by stripping with 0.1 mol/L hydrochloric acid and 1g/L thiourea. The presented preconcentration procedure was applied to the determination of Hg2+in water and food samples, high recoveries were obtained, the detection limit (3σ) was 0.014 6μg/L, and the relative standard deviationlessthan3.2%(n=11).
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