| 摘要: |
| 以海口市美舍河市区河段为研究对象，于2020年雨季分别采集降雨径流以及降雨径流汇入后的河流瞬时水样，测定并分析主要重金属元素的浓度及其变化规律，探讨其对降雨径流的动态响应。研究结果表明：降雨径流对河流可溶态污染元素质量浓度的贡献不突出，对可溶态锌（Zn）、砷（As）、镉（Cd）、硒（Se）具有一定稀释作用，排水口下游 3 m处是可溶态铬(Cr）、锰（Mn）、钴（Co）对降雨径流响应最显著区域；降雨径流对各悬浮态元素质量浓度贡献较大，排水口下游7 m处是绝大多数悬浮态元素对降〖JP〗雨径流响应最显著区域；Mn、Zn、Cr、镍（Ni）、As、Co、Cd 7种元素的总质量浓度对降雨径流的动态响应表现为先上升后下降。其中，排水口下游3 m处是Cr、As总质量浓度对降雨径流响应最显著区段，排水口下游7 m处是Mn、Co、Ni、Zn及Cd总质量浓度对降雨径流响应最显著区段。降雨径流对河流主要污染元素年输入总量估算结果表明，海口市建成区降雨径流向美舍河等受纳水体直接年输入量最大的是Mn和Zn，其次是Cr、As、Ni，Se与Cd的年输入量最小。 |
| 关键词: 降雨径流 河流 重金属 动态响应 |
| DOI： |
| 分类号:X824 |
| 基金项目:国家自然科学基金资助项目(41867060)；公益性行业(农业)科研专项 (201503108) |
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| Dynamic Response of River Main Chemical Elements to Rainfall Runoff |
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LIU Duo，LI Hai-pu
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School of Chemistry and Chemical Engineering, Central South University, Changsha，Hunan 410083, China
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| Abstract: |
| Taking the urban reach of the Meshe River in Haikou as the research object, the rainfall runoff and the instantaneous water samples of the river after the rainfall runoff into the river were collected respectively in the rainy season of 2020. The concentrations of major heavy metal elements and their variation rules were measured and analyzed, and the dynamic response to the rainfall runoff was discussed. The results show that the contribution of rainfall runoff to the concentration of soluble pollution elements is not significant, but has a certain dilution effect on soluble zinc (Zn), arsenic (As), cadmium (Cd) and selenium (Se). 3 m downstream of the drainage outlet is the area where soluble chromium (Cr), manganese (Mn) and cobalt (Co) have the most significant response to rainfall runoff. Rainfall runoff makes a great contribution to the mass concentration of suspended elements, and 7 m downstream of the rainwater drain is the area where most of the suspended elements have the most significant response to rainfall runoff. The dynamic response of the total concentration of Mn, Zn, Cr, nickel (Ni), As, Co and Cd to the rainfall runoff is firstly increased and then decreased. Among them, 3 m downstream of the drain is the section where the total mass concentration of Cr and As has the most significant response to rainfall runoff; 7 m downstream of the drain is the section where the total mass concentration of Mn, Co, Ni, Zn and Cd has the most significant response to rainfall runoff. The results of estimating the total annual input of major pollutant elements by rainfall runoff show that the direct annual input of Mn and Zn into the receiving water bodies such as the Meshe River from the built up area of Haikou City is the largest, followed by the input of Cr, As, Ni, Se and Cd are the smallest. |
| Key words: Rainfall runoff River Heavy metals Dynamic response |
