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• W1998030928 abstract "Most comparative studies on the efficiency of chemical modifiers have been conducted in aqueous media. In the present work, we proposed a detailed study of the use of different chemical modifiers for direct determination of arsenic in complex organic matrices by electrothermal atomic absorption spectrometry (ETAAS). Palladium, rhodium, tungsten, silver, lanthanum and a mixture of palladium and magnesium were tested. The figures of merit used for evaluation and comparison were acquired in the optimal conditions for each modifier, established by multivariate optimization of the main variables based on Doehlert designs. Singular features were observed for the chemical behaviour of some modifiers in organic matrices compared to aqueous media, such as the worse performance of Pd+Mg modifier and no notice of severe tube corrosion from La application. Lanthanum was chosen as the best chemical modifier for the present application, according to predefined criteria. Lanthanum showed the minimum limit of detection, characteristic concentration and blank signal among all tested species and no effect of the concomitants usually present in petrochemical feedstocks. Using a 200mgL(-1) lanthanum solution as a chemical modifier, the average relative standard deviations of 7 and 16% (at 3-15mugL(-1) level) and characteristic concentrations of 0.47 and 0.77mugL(-1) for naphtha and petroleum condensates, respectively, were observed." @default.
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• W1998030928 date "2005-07-15" @default.
• W1998030928 modified "2023-09-24" @default.
• W1998030928 title "Behaviour of chemical modifiers in the determination of arsenic by electrothermal atomic absorption spectrometry in petroleum products" @default.
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• W1998030928 doi "https://doi.org/10.1016/j.talanta.2005.02.014" @default.
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