Gonul L T
Dokuz Eylul University, Institute of Marine Sciences and Technology Inciralti, 35340, Izmir, Turkey.
Environ Sci Pollut Res Int. 2015 Dec;22(24):19951-60. doi: 10.1007/s11356-015-5197-9. Epub 2015 Aug 21.
Total arsenic, arsenic(III) and (V), Fe, and Mn were measured in 17 surface sediment samples from Izmir Bay. The concentrations and ecological risk of As were characterized in the sediment affected by urban and agricultural activities. Total As ranged from 8.87 to 28.3 μg g(-1) dry weight (96.5-99.9 % as inorganic As). Distribution of total As and total As/Fe followed a different trend in sediments at all sampling sites. Arsenite (As(III)) was the most dominant form followed by As(V), while organic arsenic represented a minor constituent (0.03 to 3.49 %). The highest concentration of total As was observed at Gediz River estuary and exceeded lower threshold value (threshold effects level (TEL)). Due to the biological reduction of As(V) and abundance of Fe (oxyhydr)oxides in the sediments, most inorganic As in the Izmir Bay was present as As(III). Besides, the levels of As were >TEL and <PEL at all stations, suggesting that As may not currently impose ecologically dangerous impacts in the sedimentary environment of Izmir Bay. At all sampling sites in the Izmir Bay, nevertheless, natural sources of As need to be considered to explain the distribution patterns. This work highlights the need for arsenic speciation analysis to accurately assess potential toxicity of marine resources and provides a crucial baseline to assess the impact of future development within this region.
对伊兹密尔湾17个表层沉积物样本中的总砷、砷（III）、砷（V）、铁和锰进行了测量。对受城市和农业活动影响的沉积物中砷的浓度和生态风险进行了表征。总砷含量范围为8.87至28.3微克/克干重（96.5 - 99.9%为无机砷）。在所有采样点的沉积物中，总砷和总砷/铁的分布呈现出不同的趋势。亚砷酸盐（As(III)）是最主要的形态，其次是As(V)，而有机砷占比很小（0.03%至3.49%）。在格迪兹河河口观察到总砷的最高浓度，超过了较低阈值（效应阈值水平（TEL））。由于沉积物中As(V)的生物还原以及铁（氢）氧化物的丰富存在，伊兹密尔湾的大多数无机砷以As(III)的形式存在。此外，所有站点的砷含量均>TEL且<可能效应水平（PEL），这表明目前砷可能不会对伊兹密尔湾的沉积环境造成生态危险影响。然而，在伊兹密尔湾的所有采样点，需要考虑砷的自然来源以解释其分布模式。这项工作强调了进行砷形态分析以准确评估海洋资源潜在毒性的必要性，并为评估该地区未来发展的影响提供了关键的基线。
