Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10561505 | Talanta | 2005 | 6 Pages |
Abstract
Potentiometric stripping analysis (PSA) was investigated to assay simultaneously cadmium, lead and thallium present as contaminants in highly saline solutions used in hemodialysis. The saline matrices were sodium, potassium, magnesium and calcium chlorides, sodium acetate, sodium bicarbonate and glucose, which constitute concentrates for hemodialysis. A 1000 μg mLâ1 Hg(II) solution was used to prepare the mercury film electrode (MFE) and to carry out the stripping step. After a 30 s accumulation interval the analytes were simultaneously detected in the saline matrices without using masking agents. Determination limits of 80 ng Lâ1 for cadmium and thallium, and 50 ng Lâ1 for lead were calculated and a R.S.D. ranging from 0.5 to 2.2% (n = 3) was obtained measuring the analytes directly in commercial hemodialysis saline solutions. Recoveries from spiked samples ranging from 94.6 to 102.0% were obtained. The investigated metals were found in concentrations ranging from 2.7 to 5.7 μg Lâ1 for cadmium, 27.7 to 75.8 μ Lâ1 for lead and 9.6 to 18.7 μg Lâ1 for thallium in commercial hemodialysis solutions. The PSA method showed to be adequate to the quality control of saline concentrates for hemodialysis.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Paulo CÃcero do Nascimento, Denise Bohrer, Leandro Machado de Carvalho, Carla Eliete Caon, Eduardo Pilau, Zilda Baratto Vendrame, Raquel Stefanello,