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CVG-ICP-AES法测定饮用天然矿泉水中痕量铅和汞 被引量:4

STUDY ON THE CVG-ICP-AES DETERMINATION OF TRACE AMOUNTS OF LEAD AND MERCURY IN DRINKING MINERAL WATER
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摘要 自制化学蒸气发生器并建立了KBrO3KBr K3Fe(CN)6HCl KBH4的CVG ICP AES同时直接测定饮用天然矿泉水中痕量铅和汞的方法,该方法提高了灵敏度,改善了检出限。方法的检出限分别为0.7μg·L-1(Pb220.353nm),0.1μg·L-1(Hg184.950nm),相对标准偏差分别为0.8%~7.8%(Pb)和0.5%~6.2%(Hg);回收率分别为90.0%~100.0%(Pb)和92.8%~108.0%(Hg)。方法完全能满足饮用天然矿泉水中痕量铅和汞的分析。 The water sample was treated with 0.5 mL of conc. HCl and a definite amount of KBrO 3 KBr solution to convert the state of mercury from organic to inorganic, and excess of KBrO 3 KBr solution was reacted and descomposed with hydroxylamine NaCl solution in an exact amount. Lead and mercury in the sample solution were reacted with the reagent system of K 3Fe(CN) 6 and KBH 4 to give hydrides of lead and mercury and vaporized in a self made chemical vaporization generator which was hyphenated with the ICP AES instrument. Through the modification of the condition of hydride generation, the sensitivity of both lead and mercury in the determination was remarkably improved. The detection limit of lead was found to be 0.7 μg·L -1 (measuring wavelength 220.353 nm) which is about 1/17 of the value obtained in conventional ICP AES method; and the detection limit of mercury was found to be 0.1 μg·L -1 (measuring wavelength 184.950 nm) which is about 1/30 of that in conventional ICP AES method. RSD′s obtained were in the ranges of 0.8%~7.8% for lead and 0.5%~6.2% for mercury, and recoveries tested by standard addition method were in the ranges of 90.0%~100.0% and 92.8%~108.0% for lead and mercury respectively. This method has been satisfactorily used in the analysis of drinking mineral water.
出处 《理化检验(化学分册)》 CAS CSCD 北大核心 2005年第4期268-270,274,共4页 Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
关键词 CVG-ICP-AES 饮用天然矿泉水 CVG ICP AES Lead Mercury Drinking mineral water
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