本研究評估在特殊天氣條件下，雨水收集系統收集雨水後之水質分析及相關探討。研究自2012二月份至七月份，分別由台灣科技大學研揚大樓及工程二館頂樓的小型雨水收集系統(自行設計)取得，總計94組樣品。實驗期間歷經一次沙塵暴與兩次颱風。分析雨水水質項目包含酸鹼值、電導度、鹼度、溶解性有機碳、生物急毒性、水中13種金屬元素分析(鋁、鈣、鉀、鎂、鈉、銅、鐵、錳、鋅、鎘、鉻、鉛及鎳)和3種陰離子(氯、硫酸根及硝酸根離子)，以及利用多管發酵法偵測總大腸菌群；此外，利用高量空氣採樣器收集研揚大樓一樓及工程二館頂樓空氣中的懸浮微粒，樣品濾紙一半利用消化法，另一半則溶解至酸化純水中一周後再計算金屬元素溶出百分比。

實驗結果指出在沙塵暴時的雨水其pH、濁度、導電度、溶解性有機碳、鉀、鈣、銅、鎂、錳、鈉、鋅、氯、硫酸根及硝酸根離子之濃度和數值皆顯著上升；然而在颱風雨水方面，只有鈉和鐵濃度較高，其餘性質則與普通雨水差異不大。於生物毒急毒性中，工程二館頂樓、研揚大樓、沙塵暴和颱風雨水的LC50分別為91.61%、95.64%、84.44%及100%。在乾沉降實驗中，約有10~40%不等的鉀、鈣、銅、鎂、錳、鈉及鋅會溶於酸化的水中。

We investigated the effect of special weather events on harvested rainwater quality. Total of 94 rainwater samples were collected from two rainwater harvesting systems (RWHSs) in a campus in northern Taiwan between February and July 2012. There were one dust storm and two typhoons in Taiwan during the experimental period. Harvested rainwater was analyzed, including pH, electrical conductivity (EC), turbidity, alkalinity, dissolved organic carbon (DOC), acute biotoxicity test, concentration of 13 metals (Al, Ca, K, Mg, Na, Cu, Fe, Mn, Zn, Cd, Cr, Pb and Ni) and concentration of 3 anions (Cl-, SO42- and NO3-). In addition, multiple-tube fermentation was included for detection of total coliforms (TC). During antecedent dry days, effects of dry deposition on rainwater were studied as well.

Results of harvested rainwater of dust storm showed that the value/concentration of pH, turbidity, EC, DOC, Ca, Cu, K, Mg, Mn, Na, Zn, Cl-, SO42- and NO3- were higher than normal rainwater. However, in the case of typhoon rainwater, only the concentration of Fe and Na in rainwater were higher than ordinary rainwater. There was no significant difference with normal rainwater in the results of other parameters. In the acute biotoxicity test, the lethal concentrations 50% (LC50) of the rainwater from the pilot-scale RWHS, the TR Building RWHS, dust storm and Saola typhoon were 91.61%, 95.64%, 84.44% and 100%, respectively. In the dry deposition experiment, there were 10~40% metal ions such as Cu, Ca, K, Mg, Mn, Na and Zn dissolved in the acidified water.

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