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Sequential Voltammetric Determination of Uranium, Cadmium and Lead by Using the ex situ Bismuth Film Electrode: Application to Phosphate Fertilizers
Author(s) -
Jost Cristiane L.,
di Martos Lara M.,
Ferraz Luis,
do Nascimento Paulo Cícero
Publication year - 2016
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201500347
Subject(s) - cadmium , uranium , detection limit , anodic stripping voltammetry , bismuth , chemistry , stripping (fiber) , voltammetry , nuclear chemistry , phosphate , differential pulse voltammetry , analytical chemistry (journal) , radiochemistry , electrode , cyclic voltammetry , electrochemistry , materials science , chromatography , metallurgy , organic chemistry , composite material
A sequential voltammetric procedure for the determination of uranium, cadmium and lead was investigated at an ex situ bismuth film electrode (BiFE). First, the adsorptive stripping voltammetry was applied to assay the U(VI)‐cupferron complex in the differential pulse mode (detection limit of 1.0 µg L −1 , 200 s accumulation time). Through the manipulation of the same aliquot of the sample, efforts were made to quantify cadmium and lead by square wave anodic stripping voltammetry. Detection limits of 2.03 µg L −1 for Cd (II) and 2.43 µg L −1 for Pb (II) were calculated (100 s accumulation time). The methodology was successfully applied to phosphate fertilizer samples after open vessel wet decomposition (HNO 3 /H 2 O 2 ). The following value ranges were evaluated: U (VI) 37.2–150 mg kg −1 , Pb (II) 78.3–204 mg kg −1 and Cd (II) 44.1–71.6 mg kg −1 . Validation was performed by using the standard reference materials SRM‐695 – phosphate fertilizer – and SRM‐1643e – water.