Photochemistry of marine humic substances

• Main Authors: Yen, Ta Chih, 顏大智
• Other Authors: Wang, Wei Hsien
• Format: Others
• Language: zh-TW
• Published: 1995
• Online Access: http://ndltd.ncl.edu.tw/handle/97905968396824228217

碩士 === 國立中山大學 === 海洋資源學系 === 83 === In this study, the photochemistry reactions sensitized by marine humic substance were studied. The commercial terrestrial origin Aldrich and Fluka humic acids were used for comparison. The steady-state concentrations of singlet oxygen [1O2]ss were determined by using furfuryl alcohol as a trapping agent. The goals include: 1.Measured the [1O2]ss in the surface seawater around Da- Lin-Pu outfall. 2.The effect of concentration of humic substances on [1O2]ss 3.The effect of salinity on [1O2]ss 4.The effect of metal on [1O2]ss 5.The effect of pH on [1O2]ss It is concluded that the [1O2]ss in surface seawater around Da- Lin-Pu outfall were around 1.98 X 10 exp(-14) M. The [1O2]ss generated in water is proportional to the concentration of humic substances. The terrestrial origin humic acid is more efficient than marine fulvic acis of the same concentration in the sensi- tizing reaction. [1O2]ss is not significantly affected by diff- erent salinities; Paramagnetic metal ions including Co2+, Ni2+ and Cu2+ quenched the photosensitization of the terrestrial origin humic acid and marine fulvic acid. The effects of dia- magnetic metal ions Cd2+, Zn2+, Ca2+, Mg2+ on these humic sub- stances were not sinificantly. [1O2]ss was not perturbed by varying pH range from 3 to 8.