Handbook of Sol-Gel Science and Technology 2018
DOI: 10.1007/978-3-319-32101-1_139
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Sol-Gel Environmental Sensors for Preventive Conservation of Cultural Heritage

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Cited by 3 publications
(9 citation statements)
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“…For instance, the average pH values recorded outside, in the main facade, during the warm seasons (May-August) are lower (4.6) than during the cold season (December) (6.0), which can be explained by the almost absence of rain in downtown Madrid in summer. Similar behaviour of air pollutants and their impact on environmental pH has been previously detected in other locations [21,27].…”
Section: Discussionsupporting
confidence: 83%
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“…For instance, the average pH values recorded outside, in the main facade, during the warm seasons (May-August) are lower (4.6) than during the cold season (December) (6.0), which can be explained by the almost absence of rain in downtown Madrid in summer. Similar behaviour of air pollutants and their impact on environmental pH has been previously detected in other locations [21,27].…”
Section: Discussionsupporting
confidence: 83%
“…According to previous field research, the sensors' lifetime was proved to be at about 9 months for indoor use, and about 3-4 months for outdoor use [21]. For field use, sensors could be protected by a perforated polyethylene bag since perforation allows direct contact between air and sensor surface.…”
Section: Environmental Ph Sensorsmentioning
confidence: 99%
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“…In the last decades, more sophisticated pH sensors with different transduction have emerged. As an alternative to the A-D strips, optical sensors based on the retention of conventional pH indicators in sol-gel matrices have been developed [13]. These sensors can detect and quantitatively determine the pH in the air only in the range of pH 5-8, but their exposition time is estimated at 24 h.…”
Section: Introductionmentioning
confidence: 99%
“…They are also informative about pH variations due to natural or controlled ventilation, the impact of an unusual number of visitors, or when a special event took place in the museum spaces or in its surroundings [17,18]. Therefore, environmental pH monitoring by using these sensors is a useful tool to check preventive conservation conditions quickly, since no more than 24 h is needed for sensitization of sensors with accuracy high enough to detect small variations on air quality (sensor accuracy is estimated to be ±0.1 units of the pH scale) [19].…”
Section: Introductionmentioning
confidence: 99%