scholarly journals Detection tube with composite carrier for detection of phosgene and diphosgene in air

2012 ◽  
Vol 66 (1) ◽  
pp. 79-84 ◽  
Author(s):  
Vladimír Pitschmann ◽  
Ivana Tusarová ◽  
Zbyněk Kobliha ◽  
David Vetchý
Keyword(s):  
Composite Material ◽  
Air Quality ◽  
Detection Limit ◽  
Chemical Reaction ◽  
Microcrystalline Cellulose ◽  
Continuous Monitoring ◽  
Sensitive Detection ◽  
Highly Sensitive ◽  
Highly Sensitive Detection ◽  
Composite Carrier

A new highly sensitive detection tube for measurement of concentration of phosgene and diphosgene in air has been developed. The detection is based on chemical reaction of 4-(p-nitrobenzyl)pyridine and N-phenylbenzylamine which with phosgene (diphosgene) give characteristic red methine dye. As a carrier serves spherical granules (pellets) of composite material prepared by granulation of microcrystalline cellulose with MgO. This new indication filling is stable, resistant to interferences and climatic influences. The detection limit (0.05 mg.m-3) meets the requirements for conducting hygienic checks of air quality in the workplace environment. In addition, the tube allows a prolonged and continuous monitoring of phosgene and diphosgene in air for at least 240 minutes.

scholarly journals A new detection tube to detect hydrogen cyanide in the air

2014 ◽  
Vol 20 (2) ◽  
pp. 155-161 ◽  
Author(s):  
Vladimír Pitschmann ◽  
Zbyněk Kobliha ◽  
Ivana Tusarová ◽  
Lucie Bártová ◽  
David Vetchý ◽  
...  
Keyword(s):  
Composite Material ◽  
Detection Limit ◽  
Microcrystalline Cellulose ◽  
Hydrogen Cyanide ◽  
Sensitive Detection ◽  
Visual Evaluation ◽  
Naked Eye ◽  
Colored Product

A new simple and sensitive detection tube to detect hydrogen cyanide in the air has been developed. The detection tube is based on the reaction of hydrogen cyanide with 4-nitrobenzil to form a violet colored product. The reaction takes place on the carrier made of a composite material which was prepared by pelletization of a mixture of microcrystalline cellulose and MgO. The detection tube can detect hydrogen cyanide in the air in the range of concentrations 0.1-100 mg.m-3 based on visual evaluation (by naked eye) of the change of indication layer coloring and comparison with etalon. The detection limit is 0.05 mg.m-3. The detection tube is highly selective and sufficiently stable during storage.

Highly sensitive detection for cocaine using an aptamer–cocaine–aptamer method

2020 ◽  
Vol 44 (6) ◽  
pp. 2571-2577 ◽  
Author(s):  
Li Gao ◽  
Huixing Wang ◽  
Zebin Deng ◽  
Wenwen Xiang ◽  
Haifeng Shi ◽  
...  
Keyword(s):  
Composite Material ◽  
Gold Nanoparticle ◽  
Molybdenum Disulfide ◽  
False Positive ◽  
Physical Adsorption ◽  
Sensitive Detection ◽  
Highly Sensitive ◽  
Highly Sensitive Detection

In this study, a thiol-modified aptamer was immobilized on a gold nanoparticle-modified molybdenum disulfide composite material (MoS2@AuNPs), which could remove the interference of physical adsorption and reduce false positive signals.

A highly efficient preconcentration route for rapid and sensitive detection of endotoxin based on an electrochemical biosensor

The Analyst ◽  
2020 ◽  
Vol 145 (12) ◽  
pp. 4204-4211 ◽  
Author(s):  
Wenrui Ma ◽  
Lulu Liu ◽  
Yi Xu ◽  
Li Wang ◽  
Li Chen ◽  
...  
Keyword(s):  
Detection Limit ◽  
Electrochemical Biosensor ◽  
Sensitive Detection ◽  
Highly Efficient ◽  
Highly Sensitive ◽  
Microfluidic Biosensor ◽  
Highly Sensitive Detection

A microfluidic biosensor was designed for rapid and highly sensitive detection of endotoxin, which could be detected within 0.5 h and with a detection limit of 0.5 ng mL−1.

Preparation of N-doped carbon quantum dots for highly sensitive detection of dopamine by an electrochemical method

RSC Advances ◽  
2015 ◽  
Vol 5 (12) ◽  
pp. 9064-9068 ◽  
Author(s):  
Guohua Jiang ◽  
Tengteng Jiang ◽  
Huijie Zhou ◽  
Juming Yao ◽  
Xiangdong Kong
Keyword(s):  
Quantum Dots ◽  
Detection Limit ◽  
Electrochemical Method ◽  
Carbon Quantum Dots ◽  
Sensitive Detection ◽  
Carbon Electrode ◽  
Glass Carbon Electrode ◽  
Highly Sensitive ◽  
Glass Carbon ◽  
Highly Sensitive Detection

The glass carbon electrode modified by N-doped carbon quantum dots (NCQD) (NCQD/GCE) has been used to detect dopamine (DA) with broad linear range and low detection limit.

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