Adsorption-desorption of phosphate on airborne dust and riverborne particulates in East Mediterranean seawater
文献类型：期刊论文
| 作者 | Pan, G; Krom, MD; Herut, B |
| 刊名 | ENVIRONMENTAL SCIENCE & TECHNOLOGY
 |
| 出版日期 | 2002 |
| 卷号 | 36期号:16页码:3519-3524 |
| 英文摘要 | The potential importance of adsorption-desorption behavior of phosphorus (P) on the East Mediterranean (E. Med) P cycle was investigated. Contrasting adsorption behavior between Saharan dust (SD) and Nile particulate matter (Nile PM) was observed. SD was a source of P to the region,which released an average of 3.3 +/- 0.3 mumolP/g into the surface seawater and showed no adsorption ability under the conditions close to the E. Med deep water. Saharan dust is therefore unlikely to be the reason for P limitation in the region. By contrast, Nile PM acted dual roles of a sink and source of P in different waters (surface seawater, deep seawater, and river water). Anew crossover-type adsorption-desorption model explained the contrasting adsorption behavior and the dual nature of natural particles. The model indicates that when natural particles are transported between different waters, they can be a sink (adsorption) or, a source (desorption) of phosphorus depending on the "specific concentration (lambda)", which is the ratio between the aqueous P concentration and the zero equilibrium P concentration (EPC(0)). EPC(0) refers to the solute concentration value where, the adsorption isotherm crosses over the aqueous concentration axis. When, lambda > 1, adsorption occurs whereas when lambda < 1, desorption, occurs. The model added a general development to the methodology of adsorption isotherm, where, for the first time, effects of solute concentration, solid concentration and aqueous medium (EPC(0)) on, the adsorption and desorption of P in natural waters were simultaneously described by a single equation. Using the model, it was quantitatively reconstructed that particles emitted during the pre-1964. Nile floods could be a major source of P to Egyptian coastal! waters (up to 4800 tonsP/yr), greater than the dissolved P flux (similar to3200 tonsP/yr), but a trapper of dissolved phosphate in E. Med deep waters. |
| 研究领域[WOS] | Engineering ; Environmental Sciences & Ecology |
| WOS记录号 | WOS:000177448600009 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/23916]  |
| 专题 | 生态环境研究中心_环境水质学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Pan, G,Krom, MD,Herut, B. Adsorption-desorption of phosphate on airborne dust and riverborne particulates in East Mediterranean seawater[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2002,36(16):3519-3524. |
| APA | Pan, G,Krom, MD,&Herut, B.(2002).Adsorption-desorption of phosphate on airborne dust and riverborne particulates in East Mediterranean seawater.ENVIRONMENTAL SCIENCE & TECHNOLOGY,36(16),3519-3524. |
| MLA | Pan, G,et al."Adsorption-desorption of phosphate on airborne dust and riverborne particulates in East Mediterranean seawater".ENVIRONMENTAL SCIENCE & TECHNOLOGY 36.16(2002):3519-3524. |
入库方式： OAI收割
来源：生态环境研究中心
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