Barreira Luísa A, Mudge Stephen M, Bebianno Maria J
CIMA, FCMA-Faculty of Marine and Environmental Sciences, University of Algarve, Campus de Gambelas, 8000-117 Faro, Portugal.
J Environ Monit. 2007 Feb;9(2):187-98. doi: 10.1039/b614919g. Epub 2007 Jan 12.
The concentration of sixteen individual polycyclic aromatic hydrocarbons (PAHs) was measured in the clam Ruditapes decussatus whole soft tissues from several places of the Ria Formosa lagoon (Portugal). Total PAH (tPAH) concentrations were higher in the summer (August) and winter (January) than in the other months and the distribution pattern of the individual PAHs was generally dominated by the 4 aromatic ring PAHs, followed by the 2 + 3 aromatic rings PAHs. Benzo[a]anthracene and acenaphthene were the most representative PAHs of the two fractions. Principal components analysis (PCA) revealed that, in the Ria Formosa, seasonal variations are more important than spatial variations, due to changes in PAH source. These sources ranged from petrogenic to pyrolytic or a mixture of both. The origin of clam PAHs was also assessed by partial least squares (PLS) analysis using nineteen different PAH signatures, taken from the literature. It was possible to identify boat traffic, especially in the summer, as one of the most relevant PAH sources to the Ria Formosa. The influence of boat traffic was revealed by several signatures including diesel soot, oil and weathered oil and a mixture of different individual PAHs usually found in harbour sediments. Other relevant sources included combustion of organic matter such as forest fires and diverse domestic activities, occurring mainly in the summer. Most of the clams were considered safe for human consumption, except for some point samples, which presented unusually high PAH concentrations, suggesting the need for a regular survey of PAHs in clam tissues.
在葡萄牙福尔摩沙河河口几个地点采集的波纹巴非蛤整个软组织中，测定了16种多环芳烃（PAHs）的浓度。总PAH（tPAH）浓度在夏季（8月）和冬季（1月）高于其他月份，且单个PAHs的分布模式一般以4个芳香环的PAHs为主，其次是2 + 3个芳香环的PAHs。苯并[a]蒽和苊是这两个组分中最具代表性的PAHs。主成分分析（PCA）表明，在福尔摩沙河河口，由于PAH来源的变化，季节变化比空间变化更为重要。这些来源从石油成因到热解成因或两者的混合。还使用从文献中获取的19种不同的PAH特征，通过偏最小二乘法（PLS）分析评估了蛤中PAHs的来源。有可能确定船只交通，尤其是在夏季，是福尔摩沙河河口最相关的PAH来源之一。包括柴油烟灰、油和风化油以及通常在港口沉积物中发现的不同单个PAHs的混合物在内的几种特征揭示了船只交通的影响。其他相关来源包括主要在夏季发生的森林火灾等有机物燃烧和各种家庭活动。除了一些点样本的PAH浓度异常高外，大多数蛤被认为可供人类安全食用，这表明需要定期对蛤组织中的PAHs进行调查。
