论文部分内容阅读
海水中过氧化氢(H2O2)能与多种痕量金属发生氧化还原反应并改变其存在状态,从而间接影响海洋生态系统。综述了过去30多年的研究结果并提出进一步研究方向。H2O2在100~200m以浅的上层海洋中普遍存在,浓度介于0~102nmol/L之间。H2O2在表层含量最高,随深度增加而减小;近岸海区H2O2浓度通常高于寡营养大洋;并且海水中H2O2出现典型的周日波动(白天浓度增加,于午后达到最大值后逐渐降低,至黎明达到最低值)。海水中H2O2的来源包括光化学生产、大气沉降和生物生产,一般以光化学生产为主。去除过程包括生物分解、光化学分解和化学分解,以生物分解为主。目前对H2O2在受河流影响的近岸陆架海区中的生物地球化学、光化学生产的影响因素以及H2O2的去除机制尚缺乏全面认识,在这些方面还需更多研究。
Hydrogen peroxide (H2O2) in seawater can react with many kinds of trace metals and change its existing state, which indirectly affects the marine ecosystem. Summarizes the research results over the past 30 years and puts forward further research directions. H2O2 is ubiquitous in the shallow upper ocean between 100 and 200 m at concentrations between 0 and 102 nmol / L. The content of H2O2 in the surface layer was the highest and decreased with the increase of depth. The concentration of H2O2 in the coastal area was generally higher than that in the oligotrophic ocean. The H2O2 in seawater showed typical fluctuations in the daytime (concentration increased at daytime, then decreased gradually after reaching the maximum in the afternoon) Dawn reached the lowest value). The sources of H2O2 in seawater include photochemical production, atmospheric deposition and biological production, generally based on photochemical production. The removal process includes biodegradation, photochemical decomposition and chemical decomposition, mainly biodegradation. At present, there is a lack of comprehensive understanding of the biogeochemistry and photochemical production of H2O2 in the coastal shelf area affected by rivers and the mechanism of H2O2 removal. More research is needed in these areas.