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Microsensor systems inc saw minicad mkii12/23/2023 Upper threshold limits of detectability for GA, TBA, and DBS are reported. Tabun (GA), sarin (GB), mustard agent, tributylamine (TBA a sarin stabilizer), and dibutylsulfide (DBS a mustard agent analog) were tested. Toxic agents flowing in the gas stream through the sensors can alter the characteristic fluorescence induction curves with resultant changes in photochemical yields. Commercially available handheld fluorometric detector systems were used to measure Photosystem II (PSII) photochemical efficiency of green algae and cyanobac-teria entrapped on filter paper disks. Like the cyanobacteria and algae from which they were constructed, the sensors are reasonably robust and mobile. The sensor read-out is based on well-known principles of fluorescence induction by living photosynthetic tissue. Tissue biosensors based on immobilized whole cell photosynthetic microorganisms have been developed for the detection of airborne CW agents and simulants. These biosensors may be used as continuous rapid-warning sentinels for the detection of chemical warfare (CW) agents in sunlight-exposed drinking water supplies.ĭetection of Chemical Warfare Agents in Air The unique aspect of this approach to realtime water-quality monitoring is that unlike conventional sensing devices, this sensor material is external to the detecting instrument and is continuously refreshed. For each percentage decrease, the probable error is the computed error based on standard error analysis. For a site at the Clinch River, the percentage decreases were 22.78☑.63, 8.32☐.21, and 17.71 ☑.32 (Table 1). The percentage decreases in photochemical yields observed in Tennessee River samples after a 25-min exposure to KCN, MPt, and DCMU were 21.89☐.76, 3.28☐.18, and 14.77☑.81, respectively. We have successfully detected algae in every sample that we examined and readily monitored changes in the characteristic fluorescence induction curves when the samples were exposed to potassium cyanide (KCN), methyl parathion (MPt), N’(3,4-dichlorophenyl)-N,N-dimethyl-urea (DCMU), and paraquat. The Clinch River is the main source of drinking water for Oak Ridge, TN, while the Tennessee River is a major source for the city of Knoxville. Sensor readout is based on well-known principles of fluorescence induction by living photosynthetic tissue. Working with primary-source freshwater drinking samples from the Clinch and Tennessee Rivers, we have developed a tissue-based biosensor detection system that uses naturally occurring aquatic photosynthetic tissue as the sensing material for the detection of chemical antagonists in the water. INTRODUCTION Detection of Chemical Warfare Agents in Water
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