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 results indicate that the metal-implanted method could be promising for controlling the electrochemical properties of diamond electrodes.
Abstract: Iridium-modified, boron-doped diamond electrodes fabricated by an ion implantation method have been developed for electrochemical detection of arsenite (As(III)). Ir+ ions were implanted with an energy of 800 keV and a dose of 1015 ion cm-2. An annealing treatment at 850 °C for 45 min in H2 plasma (80 Torr) was required to rearrange metastable diamond produced by an implantation process. Characterization was investigated by SEM, AFM, Raman, and X-ray photoelectron spectroscopy. Cyclic voltammetry and flow injection analysis with amperometric detection were used to study the electrochemical reaction. The electrodes exhibited high catalytic activity toward As(III) oxidation with the detection limit (S/N = 3), sensitivity, and linearity of 20 nM (1.5 ppb), 93 nA μM-1 cm-2, and 0.999, respectively. The precision for 10 replicate determinations of 50 μM As(III) was 4.56% relative standard deviation. The advantageous properties of the electrodes were its inherent stability with a very low background current. Th...
123 citations
TL;DR: In this article, a simple, selective and reliable method for rapid extraction and determination of trace amounts of Cu (II) ions from aqueous samples using octadecyl-bonded silica membrane disks modified with bis-(3-methoxy salicylaldehyde)-1,6-diaminohexane and flame atomic absorption spectrometry (FAAS) is presented.
123 citations
TL;DR: A carbon paste electrode modified with aminopropyl-grafted silica gel (APS) was evaluated as an electrochemical sensor for copper species in aqueous medium as discussed by the authors.
Abstract: A carbon paste electrode modified with aminopropyl-grafted silica gel (APS) was evaluated as an electrochemical sensor for copper species in aqueous medium. The overall analysis involved a two-step procedure: an accumulation step at open circuit, followed by medium exchange to a pure electrolyte solution for the voltammetric quantification. During the preconcentration step, copper(II) was accumulated on the APS surface by complexation with the amine groups. In the detection step, copper(II) was desorbed in acidic medium, then cathodically electrolyzed at −0.5 V for 60 s, and detected by anodic stripping square wave voltammetry. The influence of various experimental parameters on the sensor response was investigated (i.e. pH of the detection and accumulation media, electrolysis time, carbon paste composition, silica gel porosity, accumulation time). Reproducible results were obtained, giving after optimization a linear calibration in the 5×10 −8 –2×10 −7 M concentration range, with a detection limit of 3×10 −9 M. This new sensor was applied to copper analysis in laboratory tap water.
123 citations
TL;DR: In this article, a micro-total analytical system (μTAS) is described for the determination of nitrite based on its reaction with sulphanilamide to form the diazonium salt which when coupled with N -(1-naphthyl) ethylene diamine yields an azo dye whose absorbance was measured at 526nm.
123 citations
TL;DR: An analytical method based on LC and UV detection has been developed for the determination of anti-inflammatory compounds and estrogens in water samples and the drugs investigated were diclofenac, ketoprofen, ibupropfen, naproxen, clofibric acid, estriol, 17beta-ESTradiol, estrone and ethynylestradiol.
Abstract: An analytical method based on LC and UV detection has been developed for the determination of anti-inflammatory compounds and estrogens in water samples. The drugs investigated were diclofenac, ketoprofen, ibuprofen, naproxen, clofibric acid, estriol, 17beta-estradiol, estrone and ethynylestradiol. The detection limits were in the range of 6-74 microg/L and 0.041 -0.16 mg/L for acidic pharmaceuticals and estrogens, respectively, using narrow-bore C18 analytical column. Analyte enrichment from water samples was achieved by SPE procedure using polymeric Strata-X cartridges. Average recoveries obtained from 2.5 L of surface water sample were in the range of 77-98%.
123 citations