铋作为原子吸收光谱法中铅的通用内标物。
Bismuth as a general internal standard for lead in atomic absorption spectrometry.
作者信息
Bechlin Marcos A, Fortunato Felipe M, Ferreira Edilene C, Gomes Neto José A, Nóbrega Joaquim A, Donati George L, Jones Bradley T
机构信息
São Paulo State University - Unesp, Analytical Chemistry Department, P.O. Box 355, Araraquara, SP 14801-970, Brazil.
São Paulo State University - Unesp, Analytical Chemistry Department, P.O. Box 355, Araraquara, SP 14801-970, Brazil.
出版信息
Anal Chim Acta. 2014 Jun 11;831:24-30. doi: 10.1016/j.aca.2014.05.002. Epub 2014 May 2.
Bismuth was evaluated as internal standard for Pb determination by line source flame atomic absorption spectrometry (LS FAAS), high-resolution continuum source flame atomic absorption spectrometry (HR-CS FAAS) and line source graphite furnace atomic absorption spectrometry (LS GFAAS). Analysis of samples containing different matrices indicated close relationship between Pb and Bi absorbances. Correlation coefficients of calibration curves built up by plotting A(Pb)/A(Bi)versus Pb concentration were higher than 0.9953 (FAAS) and higher than 0.9993 (GFAAS). Recoveries of Pb improved from 52-118% (without IS) to 97-109% (IS, LS FAAS); 74-231% (without IS) to 96-109% (IS, HR-CS FAAS); and 36-125% (without IS) to 96-110% (IS, LS GFAAS). The relative standard deviations (n=12) were reduced from 0.6-9.2% (without IS) to 0.3-4.3% (IS, LS FAAS); 0.7-7.7% (without IS) to 0.1-4.0% (IS, HR-CS FAAS); and 2.1-13% (without IS) to 0.4-5.9% (IS, LS GFAAS).
采用线光源火焰原子吸收光谱法（LS FAAS）、高分辨率连续光源火焰原子吸收光谱法（HR-CS FAAS）和线光源石墨炉原子吸收光谱法（LS GFAAS），对铋作为铅测定的内标进行了评估。对含有不同基质的样品进行分析表明，铅和铋的吸光度之间存在密切关系。通过绘制A(Pb)/A(Bi)对铅浓度建立的校准曲线的相关系数高于0.9953（FAAS）且高于0.9993（GFAAS）。铅的回收率从52 - 118%（无内标）提高到97 - 109%（内标，LS FAAS）；从74 - 231%（无内标）提高到96 - 109%（内标，HR-CS FAAS）；从36 - 125%（无内标）提高到96 - 110%（内标，LS GFAAS）。相对标准偏差（n = 12）从0.6 - 9.2%（无内标）降低到0.3 - 4.3%（内标，LS FAAS）；从0.7 - 7.7%（无内标）降低到0.1 - 4.0%（内标，HR-CS FAAS）；从2.1 - 13%（无内标）降低到0.4 - 5.9%（内标，LS GFAAS）。
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