Study on detecting and cleaning the atmospheric particulates by plants
Date Issued
2007
Date
2007
Author(s)
Chang, Ya-Po
DOI
zh-TW
Abstract
By the means of the non-destructive leaf-washing method, we measured the dust deposition by plant of 7 and 8 tree species, under shelter and without shelter, respectively. The measurements were conducted from April to June, 2007 at Taipei. Results showed that generally Nagi Podocarp, Indian Laurel Fig and Rhododendron have highest dust deposition in Taipei area.
Deposition data with trees under shelter showed significantly high correlation with ambient PM10 data of Gu-Ting monitoring station by Taiwan EPA (Environmental Protection Administration). The correlation coefficients ranged from 0.4 to 0.6, indicated the positive correlations between the daily dust deposition and PM10 pollution. This result provides us a different approach to measure the particulate pollution in a cheaper way and in a wider area.
In an empty room, with space of 3.5 X 2.4 X 2.3 m, we measured the particulate-cleaning efficacyby a canopy of 12 pots of indoor plant and an air-cleaning ecosystem tank with size of 105 X 45 X 60 cm (Sentai Technology Co., Ltd.). Results showed that canopy with dry leaf surface may increase the indoor particulate concentration, while plants with wet surface can reduce particulate concentration. The air-cleaning ecosystem tank equipped with activated carbon and fiber filters showed the significant efficacy in particulate cleaning. However, deployment of 6 pots of plants inside the air-cleaning ecosystem tank did not show additional effect on particulate cleaning.
On April 4, 2007 there was a severe sand storm attacking Taiwan. After that, we collected leaf samples of 26 plant species in campus of NTU and along Chang-Hsing St., Taipei. By the means of a top-illumination dark field microscopy, we measured and compared the dust storm deposition on leaf surfaces. Results showed that Golden chinese banyan, Osmanthus, Macaranga, Scandent schefflera, Lalang grass, Taiwan mulberry, Coral bean tree, Common camptotheca, Guava and Malabar chestnut have significantly higher deposition of dust storm particulate than normal time. For Plum blossom and Ceylon ardisia, however, they did not have higher deposition of sand particles. This result suggests that the background dust particulate on the leaves should be considered when doing the comparison.
Subjects
懸浮微粒
植物淨污
指標植物
室內空氣品質
沙塵暴
particulate matter
dust deposition
indicator plant
indoor air quality
sand storm
Type
other
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