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纳米金颗粒检测蔬菜中重金属铅的研究 被引量:1

Determination of Heavy Metal Pb in Vegetables with Gold Nanoparticles
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摘要 氯金酸经硼氢化钠还原成纳米金颗粒,取适量纳米金颗粒加入于氯金酸一碳酸钾混合溶液中,再加入浸食子酸(GA)-氯化钠混合溶液,使反应制得没食子酸功能化的纳米金颗粒(GA-AuNP’s)。当GA-AuNP’s与痕量铅(Ⅱ)反应时,由于颗粒表面的没食子酸与铅(Ⅱ)生成络合物,导致其局域表面等离子体共振(LSPR)吸收峰发生红移。铅(Ⅱ)浓度的对数与红移的波长(λ)在2.7×10^-8~5.1×10^-6mol·L^-1范围内呈线性关系,其检出限(35/N)达1×10^-9mol·L^-1。据此提出用GA-AuNP’s分光光度法测定蔬菜中痕量铅的方法。应用此方法测定了茄子中痕量铅,并用标准加入法做回收试验,测得回收率在93.1%~111%之间,测定值的相对标准偏差(n=6)均小于2%。 Aurichlorohydric acid, H[AuCl4 ] was reduced by sodium borohydride to give gold nanoparticles (AuNP's). An appropriate amount of the AuNP's was added to a mixed solution of H[AuCl4 ]-KzCOa and reacted with mixed solution of gallic acid (GA) NaCI to give AuNP's functionalized with gallic acid (abbrv. as GA- AuNP's). It was shown that GA on the surface of AuNP's can react with Pb( Ⅱ ) ion to form a complex, leading to bathochromic shift of absorption maximum of localized surface plasma resonance (LSPR), and that linear relationship between values of lgceb(Ⅱ) and magnitude of the bathoehromic shift (λ) was kept in the range of 2. 7 ≤ 10 ^-8 to 5.1 ≤10^-6 mol · L 1 of Pb(Ⅱ), with detection limit (3S/N) of 1× 10^-9mol · L^-1. Based on these facts, by using GA-AuNP' s, a spectrophotometric method for determination of traces of Pb ( Ⅱ ) in vegetables was proposed. An eggplant sample was analyzed by this method, and recovery was tested by standard addition method, giving results of recovery in the range of 93.1% to 111% with values of RSD's (n=6) less than 2%.
出处 《理化检验(化学分册)》 CSCD 北大核心 2013年第12期1410-1413,1418,共5页 Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
基金 江苏省"青蓝工程" 江苏省高校科研成果产业化项目(JHB2012-67) 江苏经贸职业技术学院重大课题(JMZ1201210)资助
关键词 纳米金颗粒 没食子酸 铅(Ⅱ) 蔬菜 分光光度法 Gold nanoparticles Gallic acid Pb(Ⅱ) Vegetables Spectrophotometry
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