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 strategy for the ultra-sensitive detection of Pb(2+) in aqueous media has been developed, and the combination of oxidative exfoliation of graphite and subsequent chemical amination resulted in an amine functionalized graphene oxide, which showed ultra-high sensitivity.
Abstract: A strategy for the ultra-sensitive detection of Pb2+ in aqueous media has been developed. The combination of oxidative exfoliation of graphite and subsequent chemical amination resulted in an amine functionalized graphene oxide, which showed ultra-high sensitivity in detecting Pb2+, as it is an active material in modified anodic stripping voltammetry. A detection limit of as low as 10−13 M (0.1 pM) has been reached, which is comparable to the result obtained from atomic absorption spectrometry, but is dramatically lower than that from other reported electrochemical analysis methods. This simple and economic approach opens up a new window for the portable, quick, and ultra-sensitive detection of lead ions.
106 citations
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TL;DR: HILIC-ESI-MS provides a high-efficiency separation and sensitive detection of underivatized carbohydrate oligomers, e.g., the homologs of glucose up to maltoheptaose, in extracts of plant from corn, soybean, and Arabidopsis thaliana.
Abstract: A polyacrylamide (PAAm)-modified monolithic silica capillary column of increased phase ratio, 200T-PAAm, for hydrophilic interaction liquid chromatography (HILIC) was prepared. The column showed high separation efficiency, with a theoretical plate height H = 7–20 μm at a linear velocity, u = 1–7 mm/s. From a kinetic plot analysis, it was expected that the monolithic column could provide three times faster separation than particle-packed HILIC columns under a pressure limit at 20 MPa. HILIC coupled with electrospray ionization (ESI)–mass spectrometry (HILIC-ESI-MS) using the 200T-PAAm column was employed for the analysis of underivatized carbohydrates to achieve fast and efficient separations of mixtures containing mono-, di-, and trisaccharides within 5 min. Under single MS full scan mode, 200 pg of oligosaccharides was detected by the system. The limit of detection (LOD) of the LC-ESI-MS/MS system was determined using selected reaction monitoring (SRM) to be as low as 3.2 ng/mL (attomol level) for nonreducing saccharides. The system was successfully applied to the detection of disaccharides in extracts of plant, such as corn, soybean, and Arabidopsis thaliana.
106 citations
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TL;DR: Preliminary analysis of the organic esters indicated that exposure to phthalate esters via indoor air inhalation could constitute a significant contribution to total daily intake.
Abstract: The aim of this study was to assess the performance of a method of analyzing organic esters of plasticizer in indoor air by sampling air in a charcoal tube and extracting the esters in toluene using a gas chromatography−mass spectrometer (GC−MS) and flame photometric detector (FPD). An internal standardization method was used for the GC−MS measurement of phthalate esters, whereas an external calibration method was employed to determine the levels of phosphate esters by FPD. The instrumental detection limit, the instrumental lower limit of determination, and the blank and method detection limits were also determined. Mean recoveries of phthalate esters from the charcoal tube were 97.9−115%. Mean recoveries of phosphate esters were lower but reproducible. Recoveries of the esters from indoor air were generally greater than 80%. For all the compounds, no significant breakthrough was detected up to 100 μg. Thus, indoor organic esters could be accurately determined in the range of 0.6 × 10-3−23 μg/m3 by the pr...
105 citations
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TL;DR: The whole proposed methodology has demonstrated to be simple, reproducible and sensible for the determination of trace phthalate esters in red and white wine samples.
105 citations
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TL;DR: A novel method of MSPE coupled with high-performance liquid chromatography for the separation/analysis of Rhodamine B was successfully applied and showed that Rhodamines B was adsorbed rapidly on Fe3O4@SiO2@[OMIM]PF6 and was released using ethanol.
105 citations