太湖蓝藻腐解过程对沉积物重金属迁移转化影响
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摘要
为了探究太湖蓝藻腐解对水体、表层沉积物的理化性质和重金属迁移、形态的影响,本实验建立室内模拟装置进行研究分析。研究结果表明,沉积物的存在促进了蓝藻腐解的速率,蓝藻腐解过程也影响了上覆水中pH值和溶解氧(DO)条件,改变了表层沉积物的氧化还原电位和有机质含量。同时,上覆水体和表层沉积物理化性质的变化也进一步影响了重金属(Cr,Ni,Cu,Zn,As,Cd,Hg,Pb)在沉积物-水界面的迁移和化学形态变化,加大了沉积物的重金属污染程度,增加了潜在生态风险。
To investigate the effects of cyanobacteria decomposition on the physical and chemical properties of water and surface sediments, and the migration and speciation of heavy metals in Taihu Lake, the indoor simulation experiments were conducted. The results showed that the presence of sediment promoted the rate of cyanobacteria decomposition, and the process of cyanobacteria decomposition affected the pH value and dissolved oxygen concentrations in overlying water, and change the oxidation-reduction potential, organic matter in surface sediments. Cyanobacteria decomposition can change the total contents and chemical speciation of heavy metals(Cr, Ni, Cu, Zn, As, Cd, Hg, Pb) in sediment due to the change of physical and chemical properties in overlying water and sediment, and increase the degree of heavy metals pollution and the potential ecological risk in sediment.
To investigate the effects of cyanobacteria decomposition on the physical and chemical properties of water and surface sediments, and the migration and speciation of heavy metals in Taihu Lake, the indoor simulation experiments were conducted. The results showed that the presence of sediment promoted the rate of cyanobacteria decomposition, and the process of cyanobacteria decomposition affected the pH value and dissolved oxygen concentrations in overlying water, and change the oxidation-reduction potential, organic matter in surface sediments. Cyanobacteria decomposition can change the total contents and chemical speciation of heavy metals(Cr, Ni, Cu, Zn, As, Cd, Hg, Pb) in sediment due to the change of physical and chemical properties in overlying water and sediment, and increase the degree of heavy metals pollution and the potential ecological risk in sediment.
引文
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[30]VALéRIE CAPPUYNS,RUDY SWENNEN.Comparison of metal release from recent and aged Fe-rich sediments[J].Geoderma,2006,137(1):242-251.
[31]HONG Y S,KINNEY K A,REIBLE D D.Acid volatile sulfides oxidation and metals(Mn,Zn)release upon sediment resuspension:laboratory experiment and model development[J].Environmental toxicology&chemistry,2011,30(3):564-575.
[2]CHEN Fei-zhou,XIE Ping.The effects of fresh and decomposed microcystis aeruginosa on cladocerans from a subtropic chinese lake[J].Journal of freshwater ecology,2003,18(1):97-104.
[3]DUAN Hong-tao,MA Rong-hua,XU Xiao-feng,et al.Two decade reconstruction of algal blooms in China's Lake Taihu[J].Environmental science&technology,2009,43(10):3 522-3 528.
[4]XU Hai,PAERL H,QIN Bo-qiang,et al.Nitrogen and phosphorus inputs control phytoplankton growth in eutrophic Lake Taihu,China[J].Limnology&oceanography,2010,55(1):420-432.
[5]CIUTAT A,GERINO M,BOUDOU A.Remobilization and bioavailability of cadmium from historically contaminated sediments:influence of bioturbation by tubificids[J].Ecotoxicology&environmental safety,2007,68(1):108-117.
[6]王沛芳,周文明,王超,等.太湖沉积物重金属的形态特征及生态风险评价[J].重庆大学学报,2012,35(11):136-143.
[7]PENG Jian-feng,SONG Yong-hui,YUAN Peng,et al.The remediation of heavy metals contaminated sediment[J].Journal of hazardous materials,2009,161(2):633-640.
[8]WU Xin-ting,QI Chuang,XU Xiao-guang,et al.Simulation of cyanobacteia decay's impacts on nutrients in Water[J].Acta scientiae circumstantiae,2017,37(8):2 846-2 853.
[9]NI Li-xiao,LI Dan-dan,SU Li-li,et al.Effects of algae growth on cadmium remobilization and ecological risk in sediments of Taihu Lake[J].Chemosphere,2016,151:37-44.
[10]ZHU Meng-yuan,ZHU Guang-wei,ZHAO Lin-lin,et al.Influence of algal bloom degradation on nutrient release at the sedimentwater interface in Lake Taihu,China[J].Environmental science&pollution research international,2013,20(3):1 803-1 811.
[11]EULLAFFROY P,VERNRT G.The F684/F735 chlorophyll fluorescence ratio:a potential tool for rapid detection and determination of herbicide phytotoxicity in algae[J].Water research,2003,37(9):1 983-1 990.
[12]庞晓宇,吴静汇.夏季巢湖叶绿素a的时空分布特征研究[J].环境科技,2013,26(6):1-4.
[13]于海燕,周斌,胡尊英,等.生物监测中叶绿素a浓度与藻类密度的关联性研究[J].中国环境监测,2009,25(6):40-43.
[14]WANG Yuan-yuan,CHEN Fei-zhou.Decomposition and phosphorus release from four different size fractions of microcystis spp.taken from Lake Taihu,China[J].Journal of environmental sciences,2008,20(7):891-896.
[15]CHUAI Xiao-ming,DING Wei,CHEN Xiao-feng,et al.Phosphorus release from cyanobacterial blooms in Meiliang Bay of Lake Taihu,China[J].Ecological engineering,2011,37(6):842-849.
[16]SHEN Qing.Analyses on the influece of algae metabolism on pHand DO in Surface Water[J].Environmental science&technology,2011,34(12):261-262.
[17]SOBCZYN SKI T,SIEPAK J.Speciation of heavy metals in bottom sediments of lakes in the area of Wielkopolski National Park[J].Polish journal of environmental studies,2001,10(6):463-474.
[18]尚丽霞,柯凡,李文朝,等.高密度蓝藻厌氧分解过程与污染物释放实验研究[J].湖泊科学,2013,25(1):47-54.
[19]YUAN Chun-gang,SHI Jian-bo,HE Bin,et al.Speciation of heavy metals in marine sediments from the East China Sea by ICP-MSwith sequential extraction[J].Environment international,2004,30(6):769-783.
[20]郑蒙蒙,邵鲁泽,管幼青,等.藻类富集水体重金属的机理及应用[J].环境科技,2017,30(6):66-70.
[21]HOU D,HE J,LüC,et al.Distribution characteristics and potential ecological risk assessment of heavy metals(Cu,Pb,Zn,Cd)in water and sediments from Lake Dalinouer,China[J].Ecotoxicology&environmental safety,2013,93(4):135-144.
[22]HONG Y S,KINNEY K A,REIBLE D D.Effects of cyclic changes in p H and salinity on metals release from sediments[J].Environmental toxicology and chemistry,2011,30(8):1 775-1 784.
[23]WU Jin-hao,LIU Gui-ying,WANG Nian-bin,et al.The Eh in surface sediments in the northern of Liaodong Bay and its main influencing factors[J].Acta sedimentologica sinica,2012,30(2):333-339.
[24]王江涛,齐红菊,李宁,等.青岛及周边海区沉积物的氧化还原环境[J].中国海洋大学学报(自然科学版),2009(S1):184-188.
[25]WRIGHT P J,WEBER J H.Biosorption of inorganic tin and methyltin compounds by estuarine macroalgae[J].Environmental science&technology,1991,25(2):287-294.
[26]LI Zhi-yong,GUO Si-yuan,LI Lin,et al.Removal&recovery of metals in industrial waste water by algae[J].Chongqing environmental science,1997,6.
[27]JóZSEF HLAVAY,KLáRA POLY A K.Investigation on the pollution sources of bottom sediments in the Lake Balaton[J].Microchemical journal,2002,73(1):65-78.
[28]ATKINSON C A,JOLLEY D F,SIMPSON S L.Effect of overlying water pH,dissolved oxygen,salinity and sediment disturbances on metal release and sequestration from metal contaminated marine sediments[J].Chemosphere,2007,69:1 428-1 437.
[29]陈洁,李升峰.巢湖表层沉积物中重金属总量及形态分析[J].河南科学,2007,25(2):303-307.
[30]VALéRIE CAPPUYNS,RUDY SWENNEN.Comparison of metal release from recent and aged Fe-rich sediments[J].Geoderma,2006,137(1):242-251.
[31]HONG Y S,KINNEY K A,REIBLE D D.Acid volatile sulfides oxidation and metals(Mn,Zn)release upon sediment resuspension:laboratory experiment and model development[J].Environmental toxicology&chemistry,2011,30(3):564-575.
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