Abstract
Abstract. We approached the problem of sensing gaseous pollutants and malodors originating as a result of decomposition of organic compounds via chemoresistive sensors. A set of four screen-printed films based on two types of mixed tin and titanium oxides, mixed tungsten and tin oxides, and zinc oxide has been tested vs. the main gaseous components of malodors. N-butanol was also considered because of its importance as a reference gas in the odorimetric intensity scale. We found that, under proper working conditions, the films can sensitively detect such gases either in dry or in wet environments, within the range of concentrations of interest for their monitoring. We also demonstrated that the array is robust under solicitation by harmful interference gases such as CO, C6H6, NO2 and NO.
Highlights
For certain contexts, there is a need for control of the concentration of gases that result from decomposition of organic compounds
A set of four screen-printed films based on two types of mixed tin and titanium oxides, mixed tungsten and tin oxides, and zinc oxide has been tested vs. the main gaseous components of malodors
Concerning the gases deriving from waste combustion, we addressed the interference of carbon monoxide, benzene, nitrogen dioxide and oxide
Summary
There is a need for control of the concentration of gases that result from decomposition of organic compounds. Landfill emissions are characterized by very complex composition, while plants such as incinerators are potential sources of some kinds of pollutants, deriving from waste combustion such as carbon monoxide, benzene and nitrogen oxides. Concerning the gases deriving from waste combustion, we addressed the interference of carbon monoxide, benzene, nitrogen dioxide and oxide. They can be present if the landfill or the waste treatment plant is close to engines that burn fossil fuels or incinerators or because of circulation of lorries for garbage collection, depositing their loads in the landfills. B. Fabbri et al.: Sensing of gaseous malodors characteristic of landfills oxides and mixed solid solutions of them, taking into account the possible interference of typical combustion products. After the tests on the typical gases responsible for malodors in landfills, an analysis of possible interfering gases such as CO, C6H6, NO2 and NO was performed to determine the robustness of the array of sensors for in-field applications
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