Spectrophotometric flow-injection determination of copper and nickel in plant digests exploiting differential kinetic analysis and multi-site detection

Autor:	Diego Vendramini, Elias A.G. Zagatto, Viviane Grassi
Rok vydání:	2006
Předmět:	Detection limit Analyte medicine.diagnostic_test Color reaction Analytical chemistry chemistry.chemical_element Biochemistry Copper Analytical Chemistry Reaction rate Nickel chemistry Reagent Spectrophotometry medicine Environmental Chemistry Spectroscopy
Zdroj:	Analytica Chimica Acta. 570:124-128
ISSN:	0003-2670
DOI:	10.1016/j.aca.2006.04.008
Popis:	A novel strategy for implementing differential reaction-rate methods in flow-injection analysis is proposed and applied to the determination of copper and nickel in plant digests using 2-(5-brom-2-pyridylazo)-5-(diethylamino)-phenol (Br-PADAP) as the color-forming reagent. Multi-site detection is involved, therefore the flow cell is displaced between two monitoring sites, and the analytical signals refer to different conditions of sample dispersion, reaction development and timing. The system handles 20 samples h−1 and requires 0.32 mg Br-PADAP per determination. Signal additivity was evaluated within 98 and 102%, and linear responses (r > 0.999; n = 6) were verified for both copper and nickel up to 0.80 mg l−1. Detection limits of 0.01 and 0.04 mg l−1 Cu and Ni were estimated by considering the highest concentration of the counter analyte. Results are precise (R.S.D.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8aaccc953ba55106947b55fa63a53d25 https://doi.org/10.1016/j.aca.2006.04.008 Zobrazit plný text záznamu Full Text from ScienceDirect