Solubility of phosphorus in rainwater collected in the coastal area of the Yellow sea and influencing factors
WANG Zhi-wen1, GUO Hao1, GU Han1, KONG Yi1, GAO Hui-wang1,2, YAO Xiao-hong1,2, SHI Jin-hui1,2
1. Key Laboratory of Marine Environmental Science and Ecology, Ministry of Education of China, Ocean University of China, Qingdao 266100, China; 2. Laboratory for Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China
Abstract:69 rainwater samples were collected in Qingdao during 31precipitation events from Jun. to Sep. 2020. Total phosphorus (TP), dissolved total phosphorus (DTP), dissolved inorganic phosphorus (DIP) and dissolved organic phosphorus (DOP) were characterized in terms of concentrations, solubility and influencing factors. The averaged concentrations of TP and DTP in rainwater were (6.2±1.0)μg/L and (3.8±0.6)μg/L, respectively, with the P solubility at (64.8±18.0)%. DIP dominantly contributed to DTP with the percentage of (56.7±15.7)%. Both TP and DTP had a negative power correlation with precipitation while the TP scavenging index was larger. For rainwater samples collected at the precipitation <10mm, precipitation significantly affected the P concentrations via scavenging and dilution effects. However, these effects were not detectable in samples collected at precipitation >40mm. The measured P in rainwater was derived from the washout process, which scavenged 70%~85% of particulate P to rainwater. Acidification processes significantly promoted the dissolution of particulate P with a higher efficiency of inorganic P than that of organic P. For the recorded two types of precipitation, i.e., <5mm and >30mm, pH mainly determined the P solubility with precipitation and backward air mass history to some extent. For the rainwater samples with a similar pH, the P solubility increased with increasing precipitation. For the rainwater samples with a similar pH and collected at the precipitation <5mm, the P solubility was higher with air mass history from oceans to the continent. For rainwater samples collected at 5~30mm precipitation, the single factor effect, e.g., precipitation, pH, and air mass source, on the P solubility cannot be isolated out.
王志文, 郭浩, 谷涵, 孔毅, 高会旺, 姚小红, 石金辉. 黄海近岸大气降水中磷溶解度及其影响因素[J]. 中国环境科学, 2021, 41(11): 5060-5068.
WANG Zhi-wen, GUO Hao, GU Han, KONG Yi, GAO Hui-wang, YAO Xiao-hong, SHI Jin-hui. Solubility of phosphorus in rainwater collected in the coastal area of the Yellow sea and influencing factors. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(11): 5060-5068.
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