1. College of Life Science, Northeast Agricultural University, Harbin 150030, China 2. Laboratory of Water Environmental System Engineering, Chinese Research Academy of Environmental Science, Beijing 100012, China
Abstract：Four samples (sample No. HXXD, HXXX, HXDX and HXDB) were taken from Xingkai Lake Sediments in Heilongjiang province and fluorescence spectral characteristics of Fulvic acid (FA) from sediments were studied. Conventional and excitation-emission matrix (EEM) all indicated that FA from HXXD sediment exhibited primary peaks at longer wavelengths. The analysis of fluorescence characteristic parameters indicated that the degree of humification of FA from all sample points were in the order: HXXD>HXDX>HXDB>HXXX. Fluorescence index (f450/500) suggested that FA from HXXD mainly originated from terrestrial sources, while the FA from other samples mainly originated from aquatic organism sources and terrestrial sources. Based on EEM fluorescence regional integration (FIR), the percent fluorescence responses (Pi, n) of five regions in 3EEMs was calculated. The distributions of PⅤ, n (humic acid-like region) and PⅢ, n (fulvic acid-like region) were the largest in all samples. The conclusion of the degree of humification of FA based on FIR was consistent with the analysis of conventional fluorescence parameters. The correlation analysis showed that, r(A, C) was significantly correlative with PⅤ, n/PⅢ, n, (PⅤ, n+PⅢ, n)/(PⅠ, n+PⅡ, n+PⅢ, n) and PⅤ, n. The results suggest that r(A, C) index is a reasonable tool for assessing humification degree of FA from Xingkai Lake sediments.
[1] Baker A. Environmental. Science & Technology, 2001, 35(5): 948. [2] Zhou Ping, Hui Yan, Gu Baohua. Chemosphere, 2005, 58(10): 1327. [3] Li A Z, Zhao X, Liu H J, et al. Water Research, 2011, 45(18): 6131. [4] Gagnon R, Levasseur M, Gosselin M J. Phycol, 2005, 41(3): 489. [5] Koivula N, Hnninen K. Chemosphere, 2001, 44(2): 271. [6] YANG Shao-ping, LIU Hai-lin, LIU Xin-hua(杨少平，刘还林，刘新华, 等). Geophysical&Geochemical Exploration(物探与化探), 2009, 33(5): 529. [7] McKnight D M, Boyer E W, Westerhoff P K, et al. Limnology and Oceanography, 2001, 46(1): 38. [8] He X S , Xi B D, Wei Z M, et al. Chemosphere, 2011, 82(4): 541. [9] He M C, Shi Y H, Lin C Y. Journal of Environmental Science, 2008, 20(11): 1294. [10] WU Jian, SHEN Ji(吴 健，沈 吉). Journal of Lake Sciences(湖泊科学), 2010, 22(1): 110. [11] PIAO De-xiong, WANG Feng-kun(朴德雄, 王凤昆). Journal of Lake Sciences(湖泊科学), 2011, 23(2): 196. [12] Chen Wen, Westerhoff Paul, Leenheer Jerry A, et al. Environmental Science and Technology, 2003, 37(24): 5701. [13] Peuravuori J, Koivikko R, Pihlaja K. Water Research, 2002, 36(18): 4552. [14] Baker A, Curry M. Water Research, 2004, 38: 2605. [15] ZHAO Qing-liang, JIA Ting, WEI Liang-liang(赵庆良，贾 婷，魏亮亮, 等). China Environmental Science(中国环境科学), 2009, 29(11)：1164. [16] Yu G H, Wu M J, Luo Y H, et al. Waste Management, 2011, 31(8): 1729.
