首页|期刊导航|中国海洋湖沼学报（英文版）|Photochemical production of dissolved inorganic carbon from suwannee river humic acid
中国海洋湖沼学报（英文版）2009，Vol.27Issue(3)：570-573,4.DOI:10.1007/s00343-009-9156-5
Photochemical production of dissolved inorganic carbon from suwannee river humic acid
Photochemical production of dissolved inorganic carbon from suwannee river humic acid
摘要
Abstract
The photochemical mineralization of dissolved organic carbon (DOC) to dissolved inorganic carbon (DIC) is a key process in carbon cycling. Using a Suntest CPS solar simulator, Suwannee River humic acid (SRHA) was photooxidated to examine the effects of O2 levels, the wavelength of incident light, and the concentration of Fe on the photoproduction of DIC. Increasing the O2 abundance enhanced photodegradation of SRHA. The rate of DIC photoproduction under air saturation in the first 24 h (4.40 μmol/(L h)) was increased by a factor of 1.56 under O2 saturation, but fell by only 36% under N2 saturation. To evaluate the relative importance of UV-B, UV-A, and visible radiation in the photodegradation, we examined the above process using Mylar-d films and UF-3 and UF-4 plexiglass filters. The results indicated that the UV-B, UV-A and visible wavelengths accounted for 31.8%, 32.6% and 25.6%, respectively, of DIC production with simulated sunlight irradiation. The above results also indicated that photoproduction of DIC could take place in natural water at depths greater than those that UV light can reach. When 20 μmol/L desferrioxamine mesylate (DFOM, a strong Fe complexing ligand) was added, the rate of DIC photoproduction fell to 55.6% that of the original SRHA samples with 5.46 μmol/L Fe.关键词
dissolved inorganic carbon/ dissolved organic carbon/ humic acid/ photochemistryKey words
dissolved inorganic carbon/ dissolved organic carbon/ humic acid/ photochemistry引用本文复制引用
WANG Xuejun,LOU Tao,XIE Huixiang..Photochemical production of dissolved inorganic carbon from suwannee river humic acid[J].中国海洋湖沼学报（英文版）,2009,27(3):570-573,4.基金项目
Supported by the National Science and Engineering Research Committee of Canada (No.213327) （No.213327）
