聚苯乙烯微塑料对杜氏盐藻生长及低分子量有机酸释放的影响研究  

Studying effects of polystyrene microplastics on growth and release of low molecular weight organic acids of Dunaliella salina

作　　者：董晓[1] 丁海兵[1,2] 乔馨越 李琪 DONG Xiao;DING Haibing;QIAO Xinyue;LI Qi(Frontier Science Center for Deep Ocean Multispheres and Earth System,Key Laboratory of Marine Chemistry and Technology,Ministry of Education,and College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China;Marine Ecology and Environmental Science Laboratory,Laoshan Laboratory,Qingdao 266235,China)

机构地区：[1]中国海洋大学,深海圈层与地球系统前沿科学中心,海洋化学理论与工程技术教育部重点实验室和化学化工学院,山东青岛266100 [2]崂山实验室海洋生态与环境科学功能实验室,山东青岛266235

出　　处：《海洋环境科学》2024年第2期252-261,共10页Marine Environmental Science

基　　金：国家自然科学基金面上项目(42076040);111计划(B13030)。

摘　　要：本文通过系列培养实验,研究了不同粒径(1μm、3μm、10μm)聚苯乙烯(polystyrene,PS)微塑料对杜氏盐藻(Dunaliella salina)的生长过程和低分子量有机酸释放的影响。结果表明,杜氏盐藻在生长过程中能够释放甲酸、乙酸和乳酸3种低分子量有机酸。PS微塑料的添加能够延后培养体系乙酸和乳酸的积累,降低培养体系乙酸的积累量,提高乳酸的积累量,并导致培养体系甲酸的明显积累。不同粒径PS微塑料对杜氏盐藻生长和低分子有机酸释放的影响有显著差异。粒径3μm的PS微塑料能在杜氏盐藻生长初期抑制其将海水中的NO3-N转化为NO2-N,对延后并降低培养体系乙酸积累有显著作用。粒径1μm的PS微塑料能够显著延长培养体系乳酸的积累时间。粒径1μm和3μm的PS微塑料均能显著影响杜氏盐藻甲酸的产生与消耗,使培养体系出现明显的甲酸积累。释放甲酸可能是海洋微藻普遍存在的过程。Through a series of cultivation experiments,the effects of polystyrene(PS)microplastics of different particle sizes(1μm,3μm,10μm)on the growth and the release of low molecular weight organic acids of Dunaliella salina were studied.The results showed that Dunaliella salina could release three types of low molecular weight organic acids,namely formic acid,acetic acid,and lactic acid,during its growth.The addition of PS microplastics could delay the accumulation of acetic acid and lactic acid in the culture system,reduce the amount of acetic acid,increase the amount of lactic acid,and cause a significant accumulation of formic acid.PS microplastics of different sizes had significantly different effect on the growth of Dunaliella salina and the release of low molecular weight organic acids.PS microplastics with a particle size of 3μm could inhibit the conversion of NO_(3)-N to NO_(2)-N in the seawater by Dunaliella salina at the initial phase of its growth,and had significant effect to delay and reduce accumulation of acetic acid in the culture system.PS microplastics with a particle size of 1μm could remarkably prolong the accumulation time of lactic acid in the culture system.PS microplastics with particle sizes of 1μm and 3μm both could significantly affect the production and consumption of formic acid by Dunaliella salina,leading to a noticeable accumulation of formic acid in the culture system.Releasing formic acid may be a common process in marine microalgae.

关 键 词：杜氏盐藻 聚苯乙烯 微塑料 低分子量有机酸 

分 类 号：X171.5[环境科学与工程—环境科学]