Jin Fen, Hu Jianying, Liu Jinlin, Yang Min, Wang Fu, Wang Hong
College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
Environ Sci Technol. 2008 Feb 1;42(3):746-51. doi: 10.1021/es071522i.
The ubiquity of nonylphenol (NP) in aquatic environments has been well documented, and the long-term fate of NP in sediments is a concern from the viewpoint of risk assessment due to its endocrine-disrupting effects. This paper reports on the assessment of long-term fate of NP in marine sediments by determining extractable and nonextractable fractions of NP in surface sediments and a sediment core from Bohai Bay, North China. The extractable fraction was operationally defined as the fraction of NP that was extracted with a solvent mixture of methanol/methylene chloride, and the nonextractable fraction was the portion of NP that can be released from the sediments by alkaline hydrolyzing after the initial solvent extraction. The total concentrations (extractable and nonextractable) of NP were 3.4-34.3 ng/g dw in the surface sediments and 2.2-17.7 ng/g dw in the sediment core. Depending on the sedimentation time, the percentage of nonextractable NP relative to the total NP in the core ranged from 38 to 99%. Based on the relationship between the percentage of nonextractable NP in sediments and sedimentation time, the sequestration rate of NP in the sediment core from Bohai Bay was estimated to be 0.94% x a(-1). These results have important implications in understanding the geochemical fate of NP in sediments.
壬基酚（NP）在水生环境中的广泛存在已有充分记录，鉴于其内分泌干扰效应，从风险评估的角度来看，NP在沉积物中的长期归宿令人担忧。本文通过测定中国北方渤海湾表层沉积物和一根沉积柱中NP的可提取和不可提取部分，报告了对NP在海洋沉积物中长期归宿的评估。可提取部分在操作上定义为用甲醇/二氯甲烷混合溶剂提取的NP部分，不可提取部分是指在初始溶剂萃取后通过碱性水解可从沉积物中释放出来的NP部分。表层沉积物中NP的总浓度（可提取和不可提取）为3.4 - 34.3 ng/g干重，沉积柱中为2.2 - 17.7 ng/g干重。根据沉积时间，沉积柱中不可提取NP相对于总NP的百分比范围为38%至99%。基于沉积物中不可提取NP百分比与沉积时间的关系，估计渤海湾沉积柱中NP的固存率为0.94%×a⁻¹。这些结果对于理解NP在沉积物中的地球化学归宿具有重要意义。
