台湾海峡西部海域大气中金属的特征Ⅰ.金属的浓度和粒度分布
Characteristics of metals in atmosphere over the western Taiwan Strait Ⅰ.Concentrations and distributions
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摘要: 1991～1993年,收集了台湾海峡西部海域上空大气中的181个颗粒样品和2个颗粒分级样品.采用原子分光光度法分析了其中的颗粒金属Al、Fe、Cu、Pb、Cd和Na.台湾海峡西部海域大气中颗粒金属Fe、Cu、Pb、Cd的含量明显低于大陆城市大气中的含量.大气颗粒物中Al、Cu和Pb显示了明显的年变化.Al、Fe、Cu、Pb和Cd表现出明显的季节变化,于季大于湿季,影响大气颗粒金属元素浓度季节变化的主要因素是雨水的冲刷作用和季风.大气中颗粒Fe的粒径分布呈现双峰,Al主要分布在小于2.1μm粒径上,Na主要分布在小于等于3.6μm粒径上,而Cu、Pb和Cd则主要分布在小于等于0.52μm的小颗粒上.Abstract: One hundred and eighty one aerosol samples,and two cascade impactor samples were collected in the atmosphere over the western Taiwan Strait from 1991 to 1993.Concentrations of Al,Fe.Cu,Pb,Cd,and Na were determined by an atomic absorption spectrophotometry.The contents of Fe,Cu,Pb and Cd in the atmosphere over the western Taiwan Strait were lower than those over inland cities in China,Europe or North America.Annual and seasonal variations of concentrations of the metals could be primarily attributed to washout or monsoon for non sea salt metals.Fe was presented in bimodel distributions with size around 3.6 μm and 0.52μm Al was chiefly distributed on the particles with size less than 2.1 μm,Na on the particles with size greater than or equal to 3.6 μm,and the size distributions of Cu,Pb and Cd were presented in small particles.chiefly on those with size less than or equal to 0.52 μm.
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Key words:
- Metals /
- aerosol /
- size distribution /
- the Taiwan Strait
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