Polychlorinated dibenzo-p-dioxins （PCDDs） and dibenzofurans （PCDFs） in surface sediment and bivalve from the Changjiang Estuary, China   总被引：1，自引：0，他引：1  

闻胜  惠阳  杨方星  刘征涛  徐盈 《中国海洋湖沼学报》2008,26(1):35-44

Surface sediments and bivalves were collected from the Changjiang Estuary in December 2003 and November 2004, respectively. Polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) in these samples were measured with high-resolution chromatography (HRGC)/High Resolution Mass Spectrometer (HRMS). The concentrations of total PCDD/Fs and toxic equivalent (TEQ) were 169.83±119.63 and 0.81±0.36 pg/g dry weight (dw) in sediments, and 580.33±240.17 and 7.24±3.65 pg/g dw in bivalves. The homolog compositions of PCDD/Fs were similar among samples, the most abundant congener was octa-chlorinated dibenzo-p-dioxin (OCDD) and then octa-chlorinated dibenzofuran (OCDF) and 1,2,3,4,6,7,8-hepta-chlorinated dibenzo-p-dioxin (HpCDD). The herbicide pentachlorophenol (PCP) and sodium pentachlorophenol (Na-PCP) were proved the main source of PCDD/Fs in this area.  相似文献   

瑞丽地区芒棒河序列的岩浆作用特征及其意义     

严城民  王闻胜 《云南地质科技情报》1997,(1):17-21

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基于小波变换的水文序列的近似周期检测法   总被引：4，自引：0，他引：4  

郑昱  张闻胜 《水文》1999,(6):22-25

将小波变换引入随机水文过程的研究领域,根据水文现象的物理成因,通过对水文旬进行小波变换,借以测定水文序列隐含的近似周期,并利用Ｆ检验最终确定水文序列隐含的近似周期,计算结果表明,用小波变换确定水文序列隐含的近似周期准确性较高,是一个较邹的确定水文序列近似周期的方法。  相似文献