Potentiometrie Carbon Paste Sensors for Lead(II) Based on Dithiodibenzoic and Mercaptobenzoic Aeids

Autor:	María Jesús Gismera, Jesús R. Procopio, María Teresa Sevilla
Rok vydání:	2006
Předmět:	Detection limit chemistry Stability constants of complexes Ligand Electrode Potentiometric titration Inorganic chemistry chemistry.chemical_element Potentiometric sensor Selectivity Carbon Analytical Chemistry
Zdroj:	Analytical Sciences. 22:405-410
ISSN:	1348-2246 0910-6340
Popis:	Dithiodibenzoic (DTB) acid and mercaptobenzoic (MB) acid were studied to characterize their abilities as modifier agents for lead(II) sensors. For both sensors, the best results were obtained with modified carbon paste electrodes with 24.1% of ligand. The pH influence on the potentiometric response was studied. The selectivity coefficients for both modified electrodes were tabulated. A potentiometric sensor based on DTB acid exhibited a more sensitive and selective response to lead ions than an MB electrode. The limits of detection for the DTB and MB electrodes were very similar, 5.01 x 10(-8) M and 3.98 x 10(-8) M, respectively, for lead(II) activity. The DTB sensor was applied to lead(II) ion determination in real samples and as an indicator electrode in potentiometric titrations. Natural and commercial humic acids were titrated using the DTB electrode to estimate the stability constant between these organic compounds and the lead(II) ions with successful results.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9615b166db10a18202738e99b390b62f https://doi.org/10.2116/analsci.22.405 Zobrazit plný text záznamu Full text from SpringerLink