摘要
利用光谱学手段研究江苏省西部湖泊表层水体中溶解性有机物(DOM)组成与结构,并对其来源进行分析.单位浓度可溶性有机碳在254和280 nm波长下的吸光度值(SUVA)测定结果表明,各湖泊芳香性程度及分子量大小依次为邵伯湖>天岗湖>白马湖>石臼湖>洪泽湖>固城湖>骆马湖>高邮湖>宝应湖.特定波长下吸光度的比值(E2/E3、E3/E4)显示邵伯湖和白马湖中的DOM结构复杂、分子量大、苯环多,以腐殖酸为主要成分;其它湖泊的DOM腐殖化程度较低,以富里酸为主.指数函数曲线斜率(S275～295nm)拟合结果也同样表明邵伯湖DOM分子量最大,而宝应湖最低.各湖泊荧光指数和生物指数分别处于1.13～1.30和0.47～0.67范围内,体现出DOM强烈的陆源性.四个主要荧光峰的相对荧光强度之间均存在良好的相关性,表明这些湖泊的类腐殖酸及类蛋白物质可能有着相同的来源.结合这些湖泊的特征及流域经济发展水平,可以初步推断经入湖河流携带的由农业及其下游产业产生的有机质是江苏西部湖泊中DOM的主要来源.
The composition and origin of the dissolved organic matter（DOM） in some lakes of west Jiangsu was investigated using UV-Vis absorbance and fluorescence spectroscopy.The specific ultraviolet absorption（SUVA） at 254 nm and 280 nm indicated that the aromaticity and molecular weight of DOM ranked in the order of Lake Shaobo,Lake Tiangang,Lake Baima,Lake Shijiu,Lake Hongze,Lake Gucheng,Lake Luoma,Lake Gaoyou and Lake Baoying.The E2/E3 and E3/E4 values suggested that the DOM of Lake Shaobo and Lake Baima was structural complex with humic acid being the primary component,while other lakes＇ DOM was less complex and constituted mostly by fulvic acid.The exponential slope parameter（S275-295nm） values results were consistent with the conclusion obtained from SUVA,E2/E3 and E3/E4.Fluorescence indexes and biological index of these lakes＇ DOM were ranged of 1.13-1.30,0.47-0.67,respectively,suggesting DOM a strong terrestrial origin.Significant correlation was found between the fluorescence intensities per unit organic carbon at different peaks,which indicated that the humic-like and protein-like materials in these lakes have a similar source.Considered the characterization of these lakes and the economic development,it can be deduced that most of these DOM are produced by agriculture and its downstream industries and imported with inflow rivers.
出处
《湖泊科学》
CAS
CSCD
北大核心
2012年第2期259-266,共8页
Journal of Lake Sciences
基金
国家水体污染控制与治理科技重大专项项目(2009ZX07106-001-001)资助
关键词
湖泊
溶解性有机物
光谱学
江苏省
Shennong River
Microcystis aeruginosa
algal bloom
eutrophication
Three Gorges Reservoir
