| 摘要: |
| 通过室内模拟实验, 研究了光照和盐度对海水介质中磷化氢转化的影响。结果表明, 不同光照条件下磷化氢转化率有明显差异, 按对磷化氢转化促进作用由大到小排列依次为: UVC>UVB>日光>UVA>避光条件, 单位辐照强度的 UVC 比 UVB 更能促进磷化氢的转化。在实验体系中加入臭氧、过碳酸钠的实验进一步验证自由基反应对磷化氢转化有促进作用。另外, 实验结果显示, 天然海水与人工海水盐度变化对磷化氢转化影响呈相反趋势, 通过考察几种过渡金属对磷化氢转化的影响, 初步验证了天然海水中的过渡金属等物质对磷化氢的转化具有一定的促进作用。本文的研究结果将为进一步揭示磷化氢在海洋循环中的作用和地位提供科学依据。 |
| 关键词: 磷化氢, 转化, 光照, 盐度, 模拟实验 |
| DOI：10.11693/hyhz201104003003 |
| 分类号: |
| 基金项目:国家自然科学基金项目, 30970522 号; 国家重点基础研究发展计划(973)项目, 2010CB428706 号; 国家自然科学基金项目, 40576058 号; 国家基金委“创新研究群体科学基金”资助项目, 40821004 号 |
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| EFFECTS OF LIGHT AND SALINITY ON PHOSPHINE TRANSFORMATION IN SEAWATER |
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QIN Yuan-Yuan1,2, SONG Xiu-Xian1, CAO Xi-Hua1, YUAN Yong-Quan1, YU Zhi-Ming1
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1.Key Laboratory of Marine Ecology and Environmental Science, Institute of Oceanology, Chinese Academy of Science;2.Graduate School, Chinese Academy of Science
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| Abstract: |
| In this study, we carried laboratory experiments to study the effects of light and salinity on phosphine (PH3) transformation in seawater. In a series of simulation experiments, phosphate concentration monitored at changing light and the seawater salinity conditions. The results showed that different light conditions can affect the PH3 transformation in the order of UVC>UVB>daylight>UVA>dark. Light, especially the ultraviolet light, induces O3 production in the air, which then leads to production of free radicals, the latter can probably participate in PH3 transformation. We verified this hypothesis using O3 and sodium percarbonate. In addition, we also found that salinity on PH3 transformation showed opposite effect in natural seawater versus in artificial seawater. Through studying the effects of several transitional metals on PH3 transformation, we conclude that the salinity effect on PH3 transformation in natural seawater probably resulted from solute concentration changes. This study provides further scientific basis to help clarify the function and status of PH3 in oceanic phosphorus cycle. |
| Key words: Phosphine, Transformation, Light, Salinity, Simulated experiments |
