珠江澳门水域水柱多环芳烃初步研究

Preliminary Study of Polycyclic Aromatic Hydrocarbons of Water Column in Macao Coastal Waters

对采自澳门水域水柱不同深度水样溶解相及颗粒相(悬浮颗粒物)中的多环芳烃进行了定量分析。初步结果显示:多环芳烃质量浓度(溶解相和颗粒相)为1854 4～8733 4ng L,其中溶解相多环芳烃质量浓度为892～7944 5ng L,颗粒相为339 4～969 5ng L,16种优控多环芳烃的质量浓度为940～6654ng L;悬浮颗粒物中污染物的质量浓度自水柱表层至底部逐步减小,多环芳烃在颗粒相和溶解相中的分配系数(lgKp)也自上至下呈递减趋势,说明颗粒物主要是以沉降作用和水平迁移过程为主;水柱下层样品中多环芳烃的lgKp值异常升高,与水柱下层水体的悬浮物质量浓度较高以及盐水入侵(盐水楔)作用有关。

Polycyclic aromatic hydrocarbons (PAHs) in water column from Macao coastal waters are analyzed quantitatively.The preliminary results are as follows:The mass concentrations of total PAHs (dissolved and particulate phase) are from 1 854.4 to 8 733.4 ng/L,and those of PAHs in dissolved and particulate phase range from 892 to 7 944.5 ng/L and from 339.4 to 969.5 ng/L respectively.The levels of 16 PAHs in Macao coastal waters range between 940 and 6 654 ng/L.The mass concentrations of PAHs in particulate phase and the partition coefficients (lg K_p) of PAHs between particulate phase and dissolved phase are decreasing with the increase of depth,indicating the predominant deposition process and horizontal transportation for particles in water column.The relative high lg K_p values are found for PAHs in deeper water samples,suggesting the increase of suspended particle matters and the intrusion of salt water.