Synergetic enhancement effect of room temperature ionic liquids and ammonium pyrrolidine dithiocarbamate on the chemical vapor generation of iron, cobalt and nickel in environmental and biological samples by atomic absorption spectrometric determination
Synergetic enhancement effect of room temperature ionic liquids and ammonium pyrrolidine dithiocarbamate on the chemical vapor generation of iron, cobalt and nickel in environmental and biological samples by atomic absorption spectrometric determination
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DOI：
10.1039/c1ja10262a
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发表时间：
2012
影响因子：
3.4
通讯作者：
Chujie Zeng;N. Zhou;Jiwen Luo
中科院分区：
文献类型：
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作者：
Chujie Zeng;N. Zhou;Jiwen Luo
建立了化学气相发生-火焰原子吸收光谱法测定环境和生物样品中铁、钴和镍的新方法。研究了室温离子液体（RTIL）与吡咯二硫代氨基甲酸铵（APDC）联用对铁、钴和镍的协同催化还原。RTIL的加入导致Fe、Co和Ni的CVG效率分别提高2.5、3.2和3.0倍。在RTIL和APDC存在下，Fe、Co和Ni的CVG效率分别为42%、61%和54%。在0.02%或0.01%（m/v）APDC和0.1%或0.2%（m/v）1-丁基-3-甲基咪唑六氟磷酸盐（[C4 MIM] PF 6）存在下，通过KBH 4还原酸化的分析物溶液，有效地产生了铁、钴和镍的挥发性物质。对RTIL、APDC、HNO 3、KBH 4的浓度、载气流速、反应管和转移管的长度以及干扰等因素对CVG及后续测定的影响进行了详细的评价。在优化条件下，Fe、Co和Ni的检出限（LOD）分别为18、14和11 ng mL−1。含500 ng mL− 1 Fe、Co和Ni的标准品溶液重复测定5次的相对标准偏差分别为5.3%、4.6%和4.3%。方法用于环境标准物质和生物标准物质中铁、钴、镍的测定，结果令人满意。
A new method based on chemical vapor generation (CVG) coupled with flame atomic absorption spectrometry (FAAS) was developed for the determination of iron, cobalt and nickel in environmental and biological samples. Room temperature ionic liquids (RTIL) combined with ammonium pyrroldinedithiocarbamate (APDC) were used to synergetically enhance the CVG of iron, cobalt and nickel. The addition of RTIL leads to 2.5, 3.2, 3.0 times improvement in the CVG efficiencies of Fe, Co and Ni, respectively. The efficiencies for the CVG of Fe, Co and Ni in the presence of RTIL and APDC were 42%, 61% and 54%, respectively. Volatile species of iron, cobalt and nickel were effectively generated through reduction of acidified analyte solutions with KBH4 in the presence of 0.02% or 0.01% (m/v) APDC and 0.1% or 0.2% (m/v) 1-butyl-3-methylimidazolium hexafluorophosphate ([C4MIM]PF6). Some parameters that influenced CVG and subsequent determination were evaluated in detail, such as the concentrations of RTIL, APDC, nitric acid (HNO3) and KBH4; flow rates of carrier gas, lengths of reaction tube and transfer tube, as well as interferences. Under optimized conditions, the detection limits (LODs) for Fe, Co and Ni were 18, 14 and 11 ng mL−1, respectively. Relative standard deviations for five replicate determinations of the standard solution containing 500 ng mL−1Fe, Co and Ni were 5.3%, 4.6% and 4.3%, respectively. The proposed method was successfully applied to the determination of iron, cobalt and nickel in certified environmental and biological reference materials with satisfactory results.