Topic
Detection limit
About: Detection limit is a research topic. Over the lifetime, 34379 publications have been published within this topic receiving 644817 citations. The topic is also known as: limit of detection & lower detection limit.
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TL;DR: The DLLME-SFO method was successfully applied for the determination of vanadium in water and parsley and the calibration graph using the preconcentration system for vanadium was linear from 20 to 1000 ng L(-1) with a correlation coefficient of 0.9996.
97 citations
TL;DR: In this article, Lacase (Lac) from Rhus vernificer a was covalently immobilized onto 1-aminopyrene (1-AP) functionalized reduced graphene oxides (rGOs)-modified glassy carbon electrode by encapsulation with chitosan.
Abstract: Laccase (Lac) from Rhus vernificer a was covalently immobilized onto 1-aminopyrene (1-AP) functionalized reduced graphene oxides (rGOs)-modified glassy carbon electrode by encapsulation with chitosan. The biosensor was characterized with respect to the optimum pH and polarized potentials for the determination of phenols, and its response time, sensitivity, linear range, detection limit, and stability. Hydroquinone and catechol were selected as the analytes and detected based on the direct electron transfer behavior of Lac and its enzymatic oxidation of analyte. The sensitivities of the electrode were 14.16, 15.79 μA mM −1 with linear ranges of 3–2000, 15–700 μM for hydroquinone and catechol, respectively. The detection limits (S/N = 3) were 2 and 7 μM for hydroquinone and catechol, respectively with a fast response time ( t 95% ) of less than 5 s. Moreover, the immobilized Lac showed high affinity to hydroquinone and catechol with K m app values of 5 and 0.3 mM, respectively. As a consequence, the biosensor demonstrated suitable stability ( ca. 7 days; over 300 determinations) and good repeatability with a relative standard deviation of 3.96%. The recovery study of hydroquinone in real water samples gave values from 82.7% ± 10% to 105.9% ± 8%, confirming its application potential in the measurement of phenols in real samples.
97 citations
TL;DR: In this paper, a procedure for determining Se(IV) and total dissolved Se in sea water using cathodic stripping voltammetry in the presence of added copper was presented, where the prior step consists in adsorption of a Cu(I)2Se complex species on the hanging mercury drop electrode.
97 citations
TL;DR: The present work presents a proposal for the application of a gold screen-printed electrode an electrochemical sensor for monitoring L-dopa in stationary solution and a flow system and the method was successfully applied to the determination of L- dopa in commercial dosage forms without any pre-treatment.
97 citations
TL;DR: A simpler UV-vis spectrophotometric method was investigated for hydroquinone (HQ) determination using KMnO(4) as oxidizing agent for conversion of HQ to p-benzoquinone(BQ) as well as signal enhancer for free HQ determination.
97 citations