【摘 要】
：
In view of increasing Microplastics (MPs) contamination in the marine environment and dearth of baseline data,a study was conducted on the abundance,characterization,and seasonal distribution of MPs in the nearshore sediments of the south-east coast of In
【机 构】
：
National Centre for Coastal Research (NCCR),Ministry of Earth Science (MoES),Chennai 600100,India
论文部分内容阅读
In view of increasing Microplastics (MPs) contamination in the marine environment and dearth of baseline data,a study was conducted on the abundance,characterization,and seasonal distribution of MPs in the nearshore sediments of the south-east coast of India.Sediment samples (n =130) were collected at a distance of 1 km and 10 km from the shore region at varying depths (8-45 m) along the Chennai to Puducherry coast (165 km stretch),representing two seasons,i.e.,south-west (July 2019 and July 2020) and north-east (January 2020) monsoons.The average abundance of MPs at the 22 offshore sites along the Chennai to Puducherry coast varied from 9±4.3 to 19±12.9 particles/50 g dry weight,in July 2019 and January 2020,respectively.July 2020 had an average abundance of 10±4.5 particles/50 g dry weight.Spatially,high levels of MPs were found at 1km stations and transects in proximity to the river inlets,and temporally,the north-east month recorded the maximum concentration.The dominant morphotype was the filament,and the major polymers were polyethylene and polypropylene.Scanning Electron Microscope (SEM) images revealed the surface irregularity and degradation of MPs due to weathering.The study highlights that high sediment contamination by MPs occurs during heavy rainfall and accumulates closer to river inlets.Eventually,this study suggests that appropriate management of plastic wastes on the landside will reduce MP contamination in the marine environment.
其他文献
Microplastics existing widely in different matrices have been regarded as a reservoir for emerging contaminants.Mariculture systems have been observed to host microplastics and antibiotic resistance genes (ARGs).However,more information on proliferation o
The recovery of scattered metal ions such as perrhenate (Re(Ⅶ)) from industrial effluents has enormous economic benefits and promotes resource reuse.Nanoscale-metal/biochar hybrid biosorbents are attractive for recovery but are limited by their insufficie
半球谐振子固有刚性轴方位角测量是谐振子制造及调平等工艺过程的重要基础.首先对半球谐振子固有刚性轴方位角的测定方法进行了理论分析,其次开展了基于位置激励的半球谐振子谐响应仿真研究,模拟了固有刚性轴位置的测定过程,最后通过设计试验,采用非接触式声波激励,激光多普勒测振仪采集唇缘不同位置的振动信号,完成了半球谐振子固有刚性轴方位角的测定.该方法的角度分辨率优于1 °,结果表明:其固有频率主轴方位角的辨识误差约为4.4％,具有良好的可行性,该方法装置简单、便于操作,对半球谐振子初期研制过程中固有刚性轴方位角的精确
On October 18th 2021,the inaugural ceremony for the first wastewater resource recovery factory (WRRF) in China,Yixing Concept WRRF (Fig.1),was held in the Environmental Science Park,Yixing,Jiangsu Province(Li,2021).It is a milestone for water pollution co
Formation of secondary inorganic aerosol (SIA) was investigated during a six-month long heating season in Harbin,China.Enhanced sulfate formation was observed at high relative humidity (RI),with the same threshold RH (80％) for both colder and warmer measu
In wastewater treatment plants (WWTPs),microplastics (MPs) are complex,especially with mixed domestic-industrial influents.Conventional random grab sampling can roughly depict the distribution and characterstics of MPs but can not accurately reflect their
Mercury (Hg0) is a hazardous air pollutant for its toxicity,and bioaccumulation.This study reported that membrane biofilm reactor achieved mercury removal from flue gas using nitrate as the electron acceptor.Hg0 removal efficiency was up to 88.7％ in 280 d
Cutting fluid plays a cooling-lubrication role in the cutting of metal materials.However,the substantial usage of cutting fluid in traditional flood machining seriously pollutes the environment and threatens the health of workers.Environmental machining t
Understanding the fate and toxicity of microplastics (MPs,＜ 5 mm plastic particles) is limited by quantification methods.This paper summarizes the methods in use and presents new ones.First,sampling and pretreatment processes of MPs,including sample colle
通过大型振动台模型试验研究了减震层效能评定方法的准确性和减震层作用下衬砌结构与最不利的IV级和V级围岩在激振过程中的相互作用.研究结果表明:减震层效能评定方法可以较为准确地评估减震层在地震动力作用下对衬砌结构的作用效果,但随着激振加速度峰值的提高,试验值会与评估值产生偏差,因此对减震层效能评定方法引入地震动力损伤系数以提高其精确度;围岩级别相较于减震层的厚度对衬砌结构的地震响应更具有决定性作用;在中低烈度地震区,减震层对衬砌结构的保护效果较为明显,但减震层存在最优厚度,超过该厚度,衬砌结构遭遇地震时的震动