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: A nitrogen and sulphur co-doped carbon dot based highly selective photoluminescent probe for mercury detection has been designed and demonstrated to be excellent probes for the detection of Hg(2+) in the living cell.
Abstract: A nitrogen and sulphur co-doped carbon dot (NSCD) based highly selective photoluminescent probe for mercury detection has been designed. The NSCDs with a PL quantum yield of 69% are easily prepared from a single polymeric molecular precursor. The turn on-off fluorescence change upon mercury addition is attributed to the nonradiative electron transfer from the excited state to the d-orbital of the metal ion. The soft–soft acid–base interaction between the sulphur part of the NSCD and Hg2+ makes the fluorescence probe more specific and selective towards Hg2+ in contrast to other metal ions. The limit of detection of mercury ions is found to be 0.05 nM. Due to their high photostability, low toxicity and low detection limit, these carbon dots are demonstrated to be excellent probes for the detection of Hg2+ in the living cell.
140 citations
TL;DR: A new highly selective colorimetric chemosensor 1 (E)-9-(((5-mercapto-1,3,4-thiadiazol-2-yl)imino)methyl)-2, 3,6,7-tetrahydro-1H,5H-pyrido[3,2,1-ij]quinolin-8-ol was designed and synthesized for the sequential detection of Cu(2+) and CN
Abstract: A new highly selective colorimetric chemosensor 1 (E)-9-(((5-mercapto-1,3,4-thiadiazol-2-yl)imino)methyl)-2,3,6,7-tetrahydro-1H,5H-pyrido[3,2,1-ij]quinolin-8-ol was designed and synthesized for the sequential detection of Cu2+ and CN−. This sensor 1 exhibited an obvious color change from yellow to orange in the presence of Cu2+ in a fully aqueous solution. The detection limit (0.9 μM) of 1 for Cu2+ is far lower than the WHO limit (31.5 μM) for drinking water. In addition, the resulting Cu2+-2·1 complex can be further used to detect toxic cyanide through a color change from orange to yellow, indicating the recovery of 1 from Cu2+-2·1. Importantly, chemosensor 1 could be used to detect and quantify Cu2+ in water samples, and a colorimetric test strip of 1 for the detection of Cu2+ could be useful for all practical purposes.
139 citations
TL;DR: A rapid and accurate method to quantify zearalenone in corn using immunoaffinity chromatography for purification and high-performance liquid chromatography (HPLC) for detection and quantification of the toxin is described.
139 citations
TL;DR: The developed CPE preconcentration method was successfully applied for the determination of the three mercury species in environmental water samples and biological samples of human hair and ocean fish.
139 citations
TL;DR: The proposed sequential injection analysis (SIA) system was successfully applied for the determination of total iron as Fe(II) in pharmaceutical products (multi-vitamin tablets) and is especially useful for the determined of iron (II), yielding an orange-red colour complex with absorption maximum at 512nm.
139 citations