The determination of selenium with hydride generation AAS-IV

Agterdenbos, J.; Elteren, Johannes T. van; Bax, D.; Heege, J. P. Ter

doi:10.1016/0584-8547(86)80057-x

Cited by 40 publications

(16 citation statements)

References 21 publications

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“…In the absence of interfering species, KI produced a slight enhancement in the sensitivity, which is increasing as the KI concentration increases (Figure 2), due to the catalytic role of iodide [33], which is consistent with a previous study for hydrogen telluride generation [31]. Thus, a concentration of 1.8% (m/v) KI was selected for subsequent experiments with foreign ions, since at higher concentrations a major increase in the analytical signal was not observed.…”

Section: Resultsmentioning

confidence: 99%

Masking Agents Evaluation for Lead Determination by Flow Injection-Hydride Generation-Atomic Fluorescence Spectrometry Technique: Effect of KI, L-Cysteine, and 1,10-Phenanthroline

Beltrán

Leal

Ferrer

et al. 2016

International Journal of Analytical Chemistry

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Hydride generation (HG) of lead technique presents interferences from foreign ions of complex matrix samples. In order to minimize these interferences, the effect of masking agents such as KI, L-cysteine, and 1,10-phenanthroline was studied in the absence and in the presence of selected interfering species (As, Cr, Cu, and Fe). Different modes of addition of masking agents were accomplished, that is, to either sample or KBH4 reducing solution. The lead determinations were performed using a flow injection analysis (FIA) system coupled to HG and atomic fluorescence spectrometry (AFS). The linearity of calibration curves (1–10 μg Pb L−1) was not affected by the addition of the masking agents. The use of KI in the reducing solution diminished interferences from concentrations of As and Cu, while 1,10-phenanthroline showed a positive effect on the interference by As. Moreover, Cr and Cu appeared to be the most serious interfering ions for plumbane (PbH4), because they drastically reduced the analytical signal of lead. Fe did not present any interference under the employed experimental conditions, even at high levels. The accuracy was established through the analysis of certified reference material (i.e., BCR-610, groundwater) using KI as masking agent. The detection limit reached by FIA-HG-AFS proposed methodology was 0.03 μg Pb L−1.

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Section: Resultsmentioning

confidence: 99%

Masking Agents Evaluation for Lead Determination by Flow Injection-Hydride Generation-Atomic Fluorescence Spectrometry Technique: Effect of KI, L-Cysteine, and 1,10-Phenanthroline

Beltrán

Leal

Ferrer

et al. 2016

International Journal of Analytical Chemistry

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“…In order to solve this drawback, potassium iodide was tested as a masking agent and added to the reducing solution, since it has been reported that the mode of KI addition has an influence on its effect as masking agent. Thus, masking effect is observed when KI was added to THB, but not when it is added to sample [24]. KI masks interferences of Cu on the analytical determination of Sb due to the formation of CuI precipitate [25].…”

Section: Accuracy Evaluationmentioning

confidence: 99%

Determination of lead in complex sample matrices by atomic fluorescence spectrometry: optimisation of online hydride generation

Beltrán

Leal

Ferrer

et al. 2015

International Journal of Environmental Analytical Chemistry

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Lead hydride or plumbane (PbH 4 ) generation was optimised by exploiting a simple flow-injection method coupled to atomic fluorescence spectrometry (HG-AFS), and allowing ultra-trace lead determination. Plumbane was generated through two methods: (1) 5% (v/v) H 2 O 2 was employed as oxidant with 1.5% (m/v) KBH 4 as a reducing agent and 1.5% (v/v) HCl solution; (2) with 1.5% (m/v) K 3 [Fe(CN) 6 ] as an oxidant/sensitiser, 1% (m/v) KBH 4 as a reducing agent and 1.5% (v/v) HCl. Variables such as reagent concentrations, flow rates and sample and reagent volumes were tested and critically compared. The best results were obtained with potassium ferricyanide K 3 [Fe(CN) 6 ], achieving a detection limit of 0.03 μg Pb L −1 and a relative standard deviation (RSD) of 1.1%. The selected method was validated by analysis of certified reference materials such as SRM-2976 (mussel tissue) and BCR-610 (groundwater), with good agreement with the certified values. The developed methodology was successfully applied to different environmental sample matrices, such as rain water, tap water, ground water, spring water and drinking water, and biological samples, i.e., human blood, plasma and serum.

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“…Secondly, the catalytic effect may be attributed to the formation of iodide complex with borohydride, which can modify its hydrolysis and derivatizing capability [12]. Agterdenbos et al [18] reported that the addition of KI (0.1-1.0 mol L À 1 ) to the borohydride solution had a positive catalytic effect on hydrogen selenide generation. In the presence of KI hydrogen selenite can be generated under milder reaction conditions and in addition, it has been useful for controlling the interferences.…”

Section: Effect Of Potassium Iodide Concentrationmentioning

confidence: 99%