珠江澳门水域水柱多环芳烃初步研究

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(lg Kp)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lg Kp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。

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

Polycyclic aromatic hydrocarbons (PAHs) in water column from Macau 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 Macau 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.