Nelson Maniasso

TL;DR: In this paper, a review deals with the general use of the surfactants in Analytical Chemistry and the principal characteristic of the micelle is the improvement in selectivity and/or sensitivity of the analytical determination with emphasis on the catalytic reaction and "cloud point" extraction.

TL;DR: In this article, the anionic surfactant sodium dodecane sulphonic acid (SDSA) was used for the extraction and preconcentration of the 16 polycyclic aromatic hydrocarbons (PAHs) classified as priority pollutants by the EPA from water samples (network supply, underground and river).

TL;DR: The proposed method, based on the use of the cationic surfactant cetylpyridinium chloride (CPC) that enables the separation of the oxidation peaks potential of ascorbic acid and dopamine, successfully applied to the simultaneous determination of AA and DA in dopamine hydrochloride injection (DHI) samples spiked with AA.

TL;DR: A flow-injection procedure is proposed for the spectrophotometric determination of nickel in plants and foodstuffs using 2-(5-brom-2-pyridylazo)-5-(diethylamino)-phenol (Br-PADAP) as colour-forming reagent.

TL;DR: In this article, an improved spectrophotometric determining of cobalt and nickel is proposed, which exploits differences in reaction rates between cobalt/citrate complexes and 4-(2-pyridylazo) resorcinol (PAR).