Liu Guo-qing, Zhang Gan, Li Jun, Li Ke-chang, Guo Ling-li, Liu Xiang, Chi Ji-song, Peng Xian-zhi, Qi Shi-hua
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
Huan Jing Ke Xue. 2005 May;26(3):141-5.
The western shoal of the Lingding Bay is known to be an important deposition zone of terrestrial substance in the Pearl River Estuary (PRE). In this study, the vertical variations of concentration and fluxes of polycyclic aromatic hydrocarbon (PAH) are investigated in a core from the west shoal of Lingding Bay. In combining with 210Pb-dating, the PAHs sedimentary record in the last 100 years is reconstructed. The sigmaPAH concentration ranged from 59 ng x g(-1) to 330 ng x g(-1) throughout the core with two distinct peaks. An initial increase in sigmaPAH concentration was found around the 1860s, followed with the first maximum in the 1950s. There was a decrease in total PAHs concentration and flux in 1960s and 1970s. A sharp increase in PAHs levels was observed from 1980s and a maximum was found in the 1990s. PAHs diagnostic ratios indicate that PAH in the sediment core are mainly of pyrolytic origin. PAHs concentrations are found to correlate positively with the Gross Domestic Production, vehicle numbers and power generation in the surrounding regions, indicating that the PAHs in the sediment core are mainly anthropogenic. Atmospheric deposition and land runoff may serve as the important pathway of PAHs input to the sediment.
伶仃湾西部浅滩是珠江口重要的陆源物质沉积区。本研究对伶仃湾西部浅滩岩芯中多环芳烃（PAH）的浓度和通量的垂直变化进行了调查。结合210Pb测年，重建了过去100年的PAHs沉积记录。整个岩芯中总PAH浓度范围为59 ng x g(-1)至330 ng x g(-1)，有两个明显的峰值。在19世纪60年代左右发现总PAH浓度开始增加，随后在20世纪50年代出现第一个最大值。在20世纪60年代和70年代，总PAHs浓度和通量有所下降。从20世纪80年代开始观察到PAHs水平急剧上升，并在20世纪90年代出现最大值。PAHs诊断比值表明，沉积物岩芯中的PAH主要来源于热解。发现PAHs浓度与周边地区的国内生产总值、车辆数量和发电量呈正相关，表明沉积物岩芯中的PAHs主要是人为来源。大气沉降和陆地径流可能是PAHs输入沉积物的重要途径。
