Ultra-fast and low detection limit of H2S sensor based on hydrothermal synthesized Cu7S4-CuO Microflowers

2021 ◽  
pp. 130847
Author(s):  
Na wang ◽  
Rongrong Jin ◽  
Yue Zhou ◽  
Liupeng Zhao ◽  
Tianshuang Wang ◽  
...  
Keyword(s):  
Detection Limit ◽  
Low Detection Limit

Insecticide Residues on 1972 U.S. Auction-Market Tobacco

1975 ◽  
Vol 8 (1) ◽  
Author(s):  
J. J. Domanski ◽  
P. L. Haire ◽  
T.J. Sheets
Keyword(s):  
Detection Limit ◽  
Auction Market ◽  
Insecticide Residues ◽  
Low Detection Limit ◽  
Average Residue ◽  
The Individual ◽  
In Fire

AbstractAverage residue Ievels of DDT + TDE in flue-cured tobacco decreased from 6.1 ppm in 1970 to 0.85 ppm in 1972. DDT + TDE residues in Burley also dropped sharply from previous levels. In 1972 one sample from Kentucky contained 8.17 ppm; all other Burley samples were less than 0.25 ppm. DDT + TDE residues also declined in fire-cured and air-cured types; of these samples Tennessee dark air-cured tobacco contained the highest average residue (3.5 ppm of DDT + TDE). In 1972 over 90 % of the flue-cured samples were positive for toxaphene. Since each of our samples was a composite of tobacco from 10 farmers, we cannot conclude from this result that 90 % of the individual piles contained toxaphene. Significant amounts of toxaphene were found in other types also; for example, 50 % of the 1972 Burley samples had toxaphene concentrations greater than 0.5 ppm. Average endosulfan levels decreased between 1970 and 1972 in flue-cured and Burley tobaccos. However, in all of the dark air and dark fire-cured samples from Tennessee endosulfan residues exceeded 5 ppm. Average endrin residues were at or near the low detection limit in alI samples except fire-cured and dark air-cured tobacco from Tennessee; these averaged 0.26 and 0.17 ppm, respectively.

A simple method to construct a low-cost immunosensor based on a dithiol-functionalized polydopamine platform

2021 ◽  
Author(s):  
Bo Liu ◽  
Luanying Yang ◽  
Gang Wang ◽  
Sha He ◽  
Xiaobo Wang ◽  
...  
Keyword(s):  
Detection Limit ◽  
Linear Response ◽  
Low Cost ◽  
Covalent Immobilization ◽  
The Self ◽  
Simple Method ◽  
Low Detection Limit

A simple and low-cost electrochemical CEA immunosensor was investigated via the self-polymerization of dopamine and a dithiol compound spacer for the covalent immobilization of antibodies. The designed CEA immunosensor exhibited a linear response and a low detection limit.

An ultra-highly sensitive and selective self-enhanced AIECL sensor for public security early warning in a nuclear emergency via a co-reactive group poisoning mechanism

2021 ◽  
Author(s):  
Ziyu Wang ◽  
Meiyun Xu ◽  
Nan Zhang ◽  
Jian-Bin Pan ◽  
Xinqi Wu ◽  
...  
Keyword(s):  
Detection Limit ◽  
Early Warning ◽  
High Selectivity ◽  
Public Security ◽  
Reactive Group ◽  
Low Detection Limit ◽  
Highly Sensitive ◽  
Vapor Sensors ◽  
Nuclear Emergency

A mechanism of co-reactive group poisoning (CGP) was discovered for designing efficient I2 vapor sensors for early warning of a nuclear emergency, which give an ultra-low detection limit of 0.13 ppt as well as high selectivity.

Bifunctional 4MBA mediated recyclable SERS-based immunoassay induced by photocatalytic activity of TiO2 nanotube arrays

2016 ◽  
Vol 18 (34) ◽  
pp. 23795-23802 ◽  
Author(s):  
Xiaolong Wang ◽  
Lu Zhou ◽  
Wei Lai ◽  
Tao Jiang ◽  
Jun Zhou
Keyword(s):  
Density Functional Theory ◽  
Photocatalytic Activity ◽  
Detection Limit ◽  
Uv Irradiation ◽  
Density Functional ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Nanotube Arrays ◽  
Functional Theory ◽  
Low Detection Limit

We present a recyclable SERS-based immunoassay for CA19-9 with a low detection limit of 5 U mL−1. The linking between TiO2-NTs and 4MBA was destroyed by catalyzing 4MBA into 4-sulfobenzoate upon UV irradiation, which was clarified by UPLC/ESI-tqMS and density functional theory.

Electrochemical investigations of 8-hydroxydeoxyguanosine and its determination at an edge plane pyrolytic graphite electrode

RSC Advances ◽  
2016 ◽  
Vol 6 (3) ◽  
pp. 1722-1728 ◽  
Author(s):  
Pankaj Gupta ◽  
Munetaka Oyama ◽  
Rajendra N. Goyal
Keyword(s):  
Detection Limit ◽  
Electrochemical Oxidation ◽  
Graphite Electrode ◽  
Pyrolytic Graphite ◽  
Low Detection Limit ◽  
Pyrolytic Graphite Electrode

Electrochemical oxidation of 8-hydroxydeoxyguanosine (8-OHdG) and its detection with low detection limit is reported at pyrolytic graphite electrode.

An ultrasensitive electrochemical immunosensor for the detection of CD146 based on TiO2 colloidal sphere laden Au/Pd nanoparticles

The Analyst ◽  
2015 ◽  
Vol 140 (10) ◽  
pp. 3557-3564 ◽  
Author(s):  
Yaoguang Wang ◽  
Yueyun Li ◽  
Hongmin Ma ◽  
Aiping Guo ◽  
Bin Du ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Detection Limit ◽  
Pd Nanoparticles ◽  
Electrochemical Immunosensor ◽  
Loading Capacity ◽  
Colloidal Sphere ◽  
Low Detection Limit

An ultrasensitive electrochemical immunosensor was developed for detecting CD146. rGO-TEPA enhanced the loading capacity of Ab1 and facilitated the electron transfer. Au and Pd nanoparticles on the TiO2 colloidal sphere facilitated the decomposition of H2O2. The immunosensor exhibited an extremely low detection limit of 1.6 pg mL−1 for CD146.

Design and synthesis of new functionalized 8-(thiophen-2-yl)-1,2,3,4-tetrahydroquinolines as turn-off chemosensors for selective recognition of Pd2+ ions

2020 ◽  
Vol 44 (36) ◽  
pp. 15559-15566
Author(s):  
Shally ◽  
Vijay Kumar ◽  
Ismail Althagafi ◽  
Ashish Kumar ◽  
Divya Singhal ◽  
...  
Keyword(s):  
Detection Limit ◽  
Selective Recognition ◽  
Design And Synthesis ◽  
Low Detection Limit

Functionalized 8-thienyl-1,2,3,4-tetrahydroquinoline was synthesized as a fluorescent turn-off chemosensor for selective recognition of Pd2+ ions with a low detection limit.

Design of Photoionization Detector Based on the Miniature Gas Chromatography

2013 ◽  
Vol 823 ◽  
pp. 291-295 ◽  
Author(s):  
Shou Chen Chai ◽  
Peng Yang ◽  
Cheng Jia Yang ◽  
Chun Li Cai ◽  
Na Yu
Keyword(s):  
Gas Chromatography ◽  
Detection Limit ◽  
Ionization Chamber ◽  
High Sensitivity ◽  
Fast Response ◽  
Low Detection Limit ◽  
Photoionization Detector ◽  
Key Factor ◽  
The Stability ◽  
Sensitivity Detection

In the space restricted airtight environment that people lives in, detecting harmful gas by miniature gas chromatography is the practical requirement at present, however, PIDs performance is key factor that restrict the application of miniature gas chromatography, the redesign of the detectors gas route in this paper aiming at improve detectors stability observably, and schemed out miniature PID with high sensitivity, low detection limit and fast response. The result of the experiment shows that the detection limit is 0.04ppm, the sensitivity is 101mv/ppm,the stability is 0.04×10-6/24h,meeting the project requirement. Keywords: photoionization detector; ionization chamber; sensitivity; detection limit;

scholarly journals Achieving Ultra-Low Detection Limit Using Nanofiber Labels for Rapid Disease Detection

2014 ◽  
Vol 04 (04) ◽  
pp. 214-222 ◽  
Author(s):  
Emmanuel Gikunoo ◽  
Adeyabeba Abera ◽  
Eyassu Woldesenbet
Keyword(s):  
Detection Limit ◽  
Disease Detection ◽  
Low Detection Limit
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