Previous studies have shown that plants have the ability to purify various atmospheric chemicals. Gasoline is one of the more serious pollutants. Soil and atmospheric pollution caused by gasoline is increasing due to the widespread use of automobiles. In this article, the purification characteristic of the pothos plant for atmospheric gasoline is investigated using a tin oxide gas sensor. The purification rate (Pr), defined as the purification ability per hour as described by a differential coefficient, has a maximum value at longer time intervals as the pollutant concentration becomes higher. Pr can be represented by an exponential function of lapsed time and its characteristic in soil is similar. A golden pothos plant growing in a 30-cm diameter pot of was placed in a 300-1 experimental chamber to examine its purification ability. Pr had a maximum value 40 h after a 0.04-ml injection of gasoline into the chamber. The total purification ability (P a) is also used in this study and is derived using the peak value (h) and the full width (tw) at half maximum of the tin oxide gas-sensor characteristic, namely Pa = h/tw × 100. The P a of the pothos for gasoline was about 7, with the value decreasing as the pollutant concentration increased.
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