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PASSIVE SENSOR FOR IN SITU DETECTION OF AMINES IN ATMOSPHERES
WO14181012
Nitrogenous compounds such as ammonia and aliphatic amines are particularly hazardous air pollutants due to its toxic and odorous characteristics. Aliphatic amines found in high concentrations in air are the result of their extensive use in certain types of chemical industry, used for example as raw materials or intermediates in the preparation of fertilizers, pesticides, surfactants, pharmaceuticals, polymers, dyes, etc.. A group from the Universitat de València has developed a passive colorimetric sensor for in situ detection of amines in air. The sensor, embedded in an easily malleable and manageable silicone matrix, does not require any kind of pre-treatment, power supply or external instrument. In addition, it is environmentally friendly, stable over a wide temperature range, stable to humidity and solar radiation, and resistant to reversion, so that the sensor response remains stable over time.
Applications: The sensor developed is applicable in personal and collective safety systems, environmental control systems for the detection of aliphatic amines in air, produced in many chemical companies, and for the control of aliphatic amines due to the degradation of foods, especially fish, useful for food industries. Advantages: The main advantages provided by the invention are: - Simplicity and ease of use: it is a passive colorimetric sensor that does not require any kind of pretreatment or power supply or external instrument. - Low cost: simple fabrication process without high costs - Low detection limits: suitable for use in real atmospheres, of the order of 3 mg/m3. - Quantitative detection: direct quantitative detection can be carried out by diffuse reflectance of the sensors. - Stability: against a wide range of temperatures and to humidity and solar radiation. Reversion resistance.