阳澄湖水体PI、BOD_5与TOC的相关性  

Correlation of Three Water Quality Parameters——PI,BOD_5 and TOC in Yangcheng Lake

作　　者：宋学宏[1] 顾海东[2] 邴旭文[3] 杨彩根[1] 

机构地区：[1]苏州大学基础医学与生物科学学院,江苏苏州215123 [2]苏州市环境科学研究所,江苏苏州215004 [3]中国水产科学研究院淡水渔业研究中心,江苏无锡214081

出　　处：《环境科学与技术》2011年第1期109-113,共5页Environmental Science & Technology

基　　金：江苏省社会发展项目(BS2007031);中国水产科学研究院淡水渔业研究中心中央级公益性科研院所基本科研业务费专项资金项目(115013)

摘　　要：采集阳澄湖中湖网围养殖区的下层水样,测定高锰酸指数(PI)、生化需氧量(BOD)5及总有机碳含量(TOC)等水质检测指标,对TOC分别与PI、BOD5的相关性进行分析;并用BOD5/TOC比值作为废水可生化性判定指标,对阳澄湖中湖的水质污染有机物状况进行综合评价。结果显示,阳澄湖水体的TOC与PI、BOD5存在显著的相关性,BOD5与PI、PI与TOC以及BOD5与TOC指标间的相关系数接近或大于0.800,但相关性存在季节变化,在7月高温季节,相关系数均高于0.900,冬季枯水期其相关系数下降至0.800及以下;阳澄湖中湖的BOD5/TOC值为0.48～0.72,平均0.59,各个季节的变化较大,非养殖季节或雨季的BOD5/TOC比值较低,暗示阳澄湖中湖的污染物成分较复杂,除了养殖活动及生活污水造成的有机污染外,工业污染、农业面源污染等占有较大的比例。Based on the water quality monitoring in the cage aquaculture section of Yangcheng Lake,with the samples taken from bottom-layer waters,this paper presents the correlation study on three major water quality parameters that are used to indicate organic water pollution-permanganate index（PI）,BOD5 and TOC,which are analyzed by statistical approaches.Results reveal that notable correlations exist between any two of the three parameters though seasonal changes have been found,e.g.,the correlation coefficients are all higher than 0.900 during July whereas they drop down to 0.800 during winter,the dry season.The ratio of varied ranging from 0.48 to 0.72,with an average of 0.59,in the central part of the Lake and it has been found the BOD5/TOC ratio became lower during the leisure season（no aquaculture activity） or the raining season,indicating some more complex polluting compounds have existed in the Lake other than the pollutants brought in by the cage aquaculture,which are likely from industrial and/or non-point agricultural sources.

关 键 词：总有机碳 高锰酸盐指数 生化需氧量 湖泊污染 

分 类 号：X832[环境科学与工程—环境工程]