| 引用本文: | 陈慧敏,俞晓琴,朱俊羽,李宇阳,郭燕妮,周永强,韩龙飞.太湖有色可溶性有机物(CDOM)对COD及BOD5的指示意义.湖泊科学,2021,33(5):1376-1388. DOI:10.18307/2021.0507 |
| Chen Huimin,Yu Xiaoqin,Zhu Junyu,Li Yuyang,Guo Yanni,Zhou Yongqiang,Han Longfei.Optical indices of chromophoric dissolved organic matter (CDOM) as potential indicators tracing the variability of chemical oxygen demand (COD) and biochemical oxygen demand (BOD5) in Lake Taihu*. J. Lake Sci.2021,33(5):1376-1388. DOI:10.18307/2021.0507 |
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| 太湖有色可溶性有机物(CDOM)对COD及BOD5的指示意义 |
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陈慧敏1,2, 俞晓琴1,2, 朱俊羽2, 李宇阳2, 郭燕妮1,2, 周永强2,3, 韩龙飞1
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1.湖南师范大学地理科学学院, 长沙 410081;2.中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京 210008;3.中国科学院大学, 北京 100049
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| 摘要: |
| 化学需氧量（COD）、五日生化需氧量（BOD5）及溶解性有机碳（DOC）是指示湖泊水质的重要指标，然而上述指标测定通常耗费大量时间、试剂及人力物力且排放大量有害废液.有色可溶性有机物（CDOM）是溶解性有机物（DOM）中可以强烈吸收光谱中的紫外光和可见光的部分，数据测定耗时短、方便快捷，且样品处理过程环境友好，能在很大程度上反映湖泊水质.本研究基于2016年2、5和8月在太湖均匀布设的32个采样点进行样品采集，运用光谱吸收与三维荧光-平行因子分析（EEMs-PARAFAC）探究太湖CDOM的光谱吸收和荧光组分，探讨CDOM光谱指标对湖泊BOD5、COD及DOC浓度等湖泊环境质量指标的可替代性.结果表明：（1）运用EEMs-PARAFAC方法解析出3种荧光组分：类腐殖酸C1、类酪氨酸C2和类色氨酸C3.（2）COD和BOD5和DOC在空间上呈现出相似的分布趋势，不同水期的最高值均出现在竺山湾和梅梁湾，由西北湖区至中部敞水区、东南湖湾递减.（3）在不同水期，COD、BOD5、DOC浓度和C1组分均表现为丰水期极显著大于枯水期和平水期，a254在丰、平、枯水期间无显著性差异，最大值出现在丰水期；C2与C3组分均在枯水期和平水期极显著大于丰水期.（4）在不同水文时期，COD、BOD5和DOC浓度均与a254、类腐殖酸C1呈显著正相关，丰水期太湖COD、BOD5和DOC浓度与CDOM光谱指标的线性相关性要优于枯水期和平水期.（5）CDOM光谱指标在不同水文时期均能很好地替代COD、BOD5和DOC等作为反映太湖水体中有机物污染程度及湖泊水质的指标. |
| 关键词: 太湖 有色可溶性有机物(CDOM) 平行因子分析(PARAFAC) 化学需氧量(COD) 五日生化需氧量(BOD5) |
| DOI：10.18307/2021.0507 |
| 分类号: |
| 基金项目:国家自然科学基金项目（41807362，41930760）和江苏省自然科学基金项目（BK20181104）联合资助. |
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| Optical indices of chromophoric dissolved organic matter (CDOM) as potential indicators tracing the variability of chemical oxygen demand (COD) and biochemical oxygen demand (BOD5) in Lake Taihu* |
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Chen Huimin1,2, Yu Xiaoqin1,2, Zhu Junyu2, Li Yuyang2, Guo Yanni1,2, Zhou Yongqiang2,3, Han Longfei1
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1.School of Geographic Sciences, Hunan Normal University, Changsha 410081, P. R. China;2.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;3.University of Chinese Academy of Sciences, Beijing 100049, P. R. China
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| Abstract: |
| Chemical oxygen demand (COD), biochemical oxygen demand (BOD5), and dissolved organic carbon (DOC) are important indicators tracing lake water quality, but their measurement processes are time-consuming and require a large amount of reagent, manpower and material resources, and discharges harmful waste during measurements. Chromophoric dissolved organic matter (CDOM) is the fraction of dissolved organic matter (DOM) that can strongly absorb light at the ultraviolet region. The CDOM measurement is time-saving and convenient, and environmentally friendly, and the optical indices of CDOM can be used to trace lake water quality. We collected samples from 32 sampling sites in Lake Taihu for three occasions in February, May and August of 2016, using spectral absorption and the combination of excitation-emission matrices and parallel factor analysis (EEMs-PARAFAC) to explore the optical variability of CDOM in Lake Taihu and the applicability of using CDOM indices to trace the variability of BOD5, COD, and DOC concentrations. Three fluorescent components were identified using EEMs-PARAFAC, including a humic-like C1, a tyrosine-like C2, and a tryptophan-like C3. COD, BOD5, DOC and the optical indices of CDOM all showed similar spatial distribution trends with the highest values of these indices in different hydrological scenarios being found in Zhushan Bay and Meiliang Bay in the inflowing regions of the lake. The means of COD, BOD5, DOC, and humic-like C1 in the rainy season were all significantly higher than those in the dry season and the wet-to-dry transition season. We found no significant difference between the mean of a254 during the rainy, dry season, and the wet-to-dry transition season. The means of protein-like C2 and C3 were significantly higher in the dry season and wet-to-dry transition season than those in the rainy season. In different hydrological scenarios, COD, BOD5, and DOC are all significantly positively correlated with a254 and humic-like C1, and the linear correlation between COD, BOD5, DOC and CDOM indices in Lake Taihu in the rainy season is better than that in the dry season and wet-to-dry transition season. CDOM optical indices including a254, C1, C2, C3 are potential indices tracing the variability of COD, BOD5 and DOC and are useful indicators tracing water quality in Lake Taihu and potentially a wider aquatic environment in different hydrological scenarios. |
| Key words: Lake Taihu chromophoric dissolved organic matter (CDOM) parallel factor analysis (PARAFAC) chemical oxygen demand (COD) biochemical oxygen demand (BOD5) |
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