氢化物发生新体系-原子荧光法同时测定铅和镉
A Novel Hydride Generation System for the Simultaneous Determination of Lead and Cadmium Using Atomic Fluorescence Spectrometry
查看参考文献15篇
文摘
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报道了Pb和Cd同时氢化物发生的K_3Fe(CN)_6-(NH_4)_2Ce(NO_3)_6-NaBH_4-HCl新体系,并探讨了相关反应机理。(NH_4)_2Ce(NO_3)_6作为氧化剂将Pb(Ⅱ)氧化为Pb(Ⅳ),Fe(CN)~3-6与Pb(Ⅳ)络合促进了Pb的氢化物发生。同时,体系中的(NH_4)_2Ce(NO_3)_6作为Cd氢化物发生过程中的增敏剂使荧光信号显著增强。在该体系中,Pb和Cd的氢化物发生不产生相互干扰。本实验据此建立了顺序注射-氢化物发生-双道原子荧光同时测定Pb和Cd的方法。所采用的实验条件包括NaBH_4、HCl、K_3Fe(CN)_6和(NH_4)_2Ce(NO_3)_6的浓度分别为2%、3%、0.6%和0.3%。以125μL/s进样500μL,得到的线性范围分别为0.4-15μg/L(Pb)和0.5-20μg/L(Cd);对应的检出限分别为0.09μg/L(Pb)和0.17μg/L(Cd);方法的精密度为0.5%(6.0μg/L Pb,n=9)和1.0%(6.0μg/L Cd,n=9)。将本法应用于国家标准样品GBW08608中Pb和Cd的检测。检测值与标准值相符;对河水及海水中Pb和Cd进行了同时测定,加标回收率合格。 |
其他语种文摘
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A novel hydride generation system was developed for the simultaneous hydride generation of lead and cadmium, i.e., the system of K_3 Fe (CN) _6-(NH_4)_2 Ce(NO_3)_6-NaBH_4-HCl, which no interfering effects from the hydride generation of the two species were identified. The mechanisms of the hydride generation process include the oxidation of Pb (Ⅱ) by (NH_4)_2 Ce (NO_3)_6, meanwhile, the K_3 Fe(CN)_6 was used as a coordinating reagent to form a complex with Pb(Ⅳ) which facilitates its ensuing hydride generation. Cadmium hydride generation follows the conventional process with (NH_4)_2 Ce(NO_3)_6 serves as a sensitizer. A sequential injection-hydride generation-atomic fluorescence spectrometric procedure was developed for the simultaneous determination of lead and cadmium. When employing the following experimental parameters, i. e., 2% NaBH_4o3% HCl-0.6% K_3Fe(CN)_6-0.3% (NH_4)_2 Ce(NO_3)_6, a 500-μL sampling volume at a flow rate of 125 μL/s, the obtained linear ranges were 0. 4 - 15 μg/L (Pb) and 0. 5 -20 μg/L (Cd) respectively, along with limits of detection of 0. 09 μg/L (Pb) and 0. 17 μg/L (Cd). The RSDs of the procedure were derived as 0.5% (6.0 μg/L Pb, n =9) and 1.0 % (6.0 μg/L Cd, n =9). The present procedure was applied for the determination of lead and cadmium in a certified reference material of water sample, GBW08608, a coastal sea water and a riverine water sample, with satisfactory spiking recoveries. |
来源
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分析化学
,2008,36(2):162-166 【核心库】
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关键词
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氢化物发生-原子荧光
;
铅
;
镉
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地址
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东北大学分析科学研究中心, 辽宁, 沈阳, 110004
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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0253-3820 |
学科
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化学;环境科学基础理论 |
基金
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国家自然科学基金
;
国家教育部高等学校博士学科点专项科研基金
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文献收藏号
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CSCD:3207217
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