建立浊点萃取预富集分光光度法测定食品中痕量钒的新方法.在酸性介质中,以N-苯甲酰-N-苯基羟胺(N-Benzoyl-N-Phenylhydroxylamine,BPHA)为配位剂,非离子表面活性剂Triton X-114为萃取剂,分离富集溶液中痕量钒.详细考察溶液酸度、配位剂和表面活性剂用量、反应时间、平衡温度和平衡时间等条件对浊点萃取效果的影响.最佳试验条件下,方法的线性范围为5.0μg/L~800μg/L(r=0.9997),检出限为0.62μg/L,加标回收率在98.0%~103.5%之间,相对标准偏差在1.9%~3.4%之间.已成功应用于大米、决明子茶等实际样品分析.%A new method for the determination of trace vanadium in food samples by spectrophotometric after cloud point extraction was proposed. In acid medium, N-Benzoyl-N-Phenylhydroxylamine (BPHA) was used as a coordination agent, Triton X-114 was selected as extraction, separation and enrichment of trace vanadium in solution. The effects of experimental conditions such as acidity, concentration of coordination agent and sur-factant, reaction time, equilibration temperature and time on cloud point extraction were discussed. Under the optimum conditions, a good linear relationship was obtained in the range of 5.0μg/L-800μg/L of the vanadium (r=0.9997), the detection limits of 0.62μg/L. The recoveries fell in the range from 98.0%to 103.5%and the relative standard deviations were between 1.9%and 3.4%. This method has been applied for the determination of vanadium in real samples such as rice and cassia seed with satisfactory results.
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