Geochemical speciation of metals (Cu, Pb, Cd) in fishpond sediments in Batan Bay, Aklan, Philippines
Geochemical speciation of metals (Cu, Pb, Cd) in fishpond sediments in Batan Bay, Aklan, Philippines
复制标题
DOI：
10.1007/s10661-020-08613-7
复制
发表时间：
2020-09
影响因子：
3
通讯作者：
M. Nillos;H. Taberna;Roxzien Shaye Sesbreño;I. Pahila;Y. Okamoto;N. Añasco
中科院分区：
文献类型：
--
作者：
M. Nillos;H. Taberna;Roxzien Shaye Sesbreño;I. Pahila;Y. Okamoto;N. Añasco
菲律宾阿克兰的巴坦湾主要依靠沿海渔业为生。水产养殖技术的发展，加上过度拥挤的养鱼圈，对其自然动态和环境质量产生了负面影响。包括港口和造船厂在内的土地使用活动造成化学污染，使问题进一步恶化。本文应用连续萃取技术测定了鱼塘沉积物中金属元素的地球化学形态。样品进行处理和分析的铜，镉，铅使用火焰原子吸收光谱法。铜（Cu）含量最高（10.61-66.81 μg/g-干重）。铅（Pb）含量范围为低于检测限至15.14 μg/g，镉含量范围为低于检测限至2.50 μg/g。形态研究表明，鱼塘沉积物中Cu以非残留态为主（50.03-73.34%），与可氧化态（33.89-64.75%）密切相关。沉积物中Pb以残渣态为主（33.55-62.68%）。与美国环保署和NOAA沉积物质量准则的结果比较还显示，巴坦湾沉积物可以被认为是一般无污染的铜，铅，镉，并预计不会造成不利影响，水生生物在正常条件下。然而，在一定的氧化还原条件下，大多数的网站可以被认为是中度污染的结果，铜动员从沉积物的非残留部分。总的来说，在一个重要的渔业领域，如巴坦湾的地球化学形态研究将提供有价值的见解，在某些环境条件下的金属污染物的水生生物的可用性。
Batan Bay in Aklan, Philippines supports a population largely dependent on coastal fisheries. The development of aquaculture technologies coupled with over-crowded fish pens has negatively affected its natural dynamics and environmental quality. Land-use activities including ports and shipyard further aggravate the problem by contributing to chemical pollution. The present study applied sequential extraction techniques to determine the geochemical speciation of metals in fishpond sediments. Samples were processed and analyzed for Cu, Cd, and Pb using flame atomic absorption spectroscopy. Copper (Cu) showed the highest concentration (10.61–66.81 μg/g-dry weight of sediment). Lead (Pb) content ranged from below detection limit to 15.14 μg/g, while Cd concentration ranged from below detection limit to 2.50 μg/g. Fractionation study showed that the Cu present in the fishpond sediments is mostly non-residual (50.03–73.34%) and significantly associated with the oxidizable fraction (33.89–64.75%). In contrast, the residual fraction served as the dominant host of Pb (33.55–62.68%) in the sediments. Comparison of the results with US EPA and NOAA sediment quality guidelines also revealed that the Batan Bay sediments may be considered generally non-polluted with respect Cu, Pb, and Cd, and not expected to cause adverse effects to aquatic organisms under normal conditions. However, under certain redox conditions, most of the sites may be considered moderately polluted as a result of Cu mobilization from the non-residual fractions of the sediments. Overall, geochemical speciation studies in an important fishery area like Batan Bay will provide valuable insights into the availability of metal contaminants to aquatic organisms under certain environmental conditions.