蓝藻腐烂含硫衍生污染物释放规律初步研究

目的]研究蓝藻腐烂含硫衍生污染物的释放规律。方法]基于蓝藻水华引发的饮用水异味问题,建立含硫衍生污染物测试的顶空固相微萃取-气相色谱-质谱联用检测方法,以采集的蓝藻水样与蓝藻进行实验室封闭腐烂模拟,连续进行10 d蓝藻腐烂的异味物质(主要是含硫衍生物)的质谱分析和释放量检测,并对腥臭味含硫衍生污染物进行定量分析。结果]在太湖贡湖湾水源地水样、实验室蓝藻腐烂水样和藻样中Scan方式扫描均检测出β-环柠檬醛、吲哚、甲基吲哚、苯酚、甲基苯酚和硫醇硫醚类等蓝藻代谢产物或次生代谢产物。含硫衍生污染物在腐烂过程中的释放表现出一定的规律性,蓝藻腐烂分解过程中β-柠檬醛的释放量变化不明显,蓝藻腐烂水样中二甲基三硫的最大释放量出现在第7或第8天,二甲基二硫在第4天出现最大释放量,二甲基硫在蓝藻腐烂时释放在第8或第9天出现最大值。实际水样中的二甲基三硫的最大浓度为2 344.79 ng/L,远远超过嗅阈值。结论]2007年5月底贡湖湾的污水团是大量蓝藻堆积腐烂所致。

Preliminary Study on the Emission Rules of Sulfur Derivative Pollutants in Putrefactive Cyanobacteria

Objective] The aim was to study the Characteristics of the Emission of Sulfur Derivative Pollutants in Cyanobacteria.Method] Based on water odor in drink water from Gonghu Bay in Lake Taihu,the sulfur derivatives pollutants were extracted by head space solid phase microextraction(HS-SPME) and the odor substance was identified by gas chromatography and mass spectrometry(GC-MS).Decomposed simulation was conducted in closed tube of water and cyanobacteria samples collected from Gonghu Bay in Lake Taihu.The cyanobacteria rotten odor substances was analyzed and detected by HS-SPME-GC-MS for 10 days.The sulfur derivative pollutant was expounded.Result] The primary or secondary metabolites by Cyanobacteria in water samples such as β-cyclocitral,indol,methylphenol,mercaptan and thioether were detected with scan.During the decomposition process,the emission of β-cyclocitral changed little.The maximum emission of dimethyl trisulfide appeared on the seventh and eighth day.The maximum emission of dimethyl disulfide appeared on the forth day.The maximum emission of the dimethyl sulfide was on the eighth and ninth day.The maximum concentration of dimethyl trisulfide was 2 344.79 ng/L,which was much more than the olfactory threshold.Conclusion] The sewage in Gonghu Bay in the end of May in 2007 resulted from the accumulation of cyanobacteria.