Distribution and sources of phosphorus in tidal river sediments in the Washington, DC, Area |
| |
| Authors: | W Huanxin B J Presley D J Velinsky |
| |
| Institution: | (1) Department of Earth Sciences, Zhejiang University, Hangzhou 310027, Peoples Republic of China, CN;(2) Department of Oceanography, Texas A&M University, College Station, TX 77843, USA, US;(3) Interstate Commission on the Potomac River Basin, 6110 Executive Blvd. Suite 300, Rockville, MD 20852, USA, US |
| |
| Abstract: | Sediments in the rivers and basins around Washington, DC, have high concentrations of phosphorus, which, based on geographic
distributions, is largely derived from urban runoff and municipal sewage. Dissolved-particulate phosphate exchange reactions
and biological uptake of dissolved phosphorus from the water column may be an added source of phosphorus to the sediments.
Concentrations of total sedimentary phosphorus ranged from 24 to 56 μm P/g-dw, and were highest in areas near combined sewer
outfalls. As a part of this study, sedimentary phosphorus was fractionated into Fe-P, Ca-P, Al-P, and organic phases using
a selective-sequential leaching procedure. The distribution of the phases in all sediments analyzed follow the order , Fe-P>Ca-P>Al-P.
Spatial variations in the amounts of phosphorus in the different phases is related to the sources of phosphorus to the area.
The proportions of occluded Al-P and organic P are 10–20% of the total P, respectively. This suggests that phosphorus from
natural sources is small compared to anthropogenic inputs in this area. The high leachable Fe-P and Ca-P in these sediments
might contribute a substantial amount of P to the water column under conditions of remobilization.
Received: 20 February 1996 · Accepted: 2 April 1996 |
| |
| Keywords: | Sediment Washington DC Pollution phosphorus nutrients |
| 本文献已被 SpringerLink 等数据库收录！ |
|
