黄河中下游水体中邻苯二甲酸酯的分布特征

Distribution characters of phthalic acid ester in the waters middle and lower reaches of the Yellow River.

采集了黄河中下游12个断面的河水、沉积物和悬浮颗粒物样品，用气相色谱法对样品中邻苯二甲酸酯类（PAEs）有机物含量进行测定。分析其在黄河水体中的分布特征．结果表明，在小浪底-东明桥之间，干流水相PAEs浓度分布范围为3.99×10^-3～45．45×10^-3mg／L,支流浓度范围为15.80×10^-3～49．53×10^-3mg／L，远远高于干流的浓度。在所研究支流中，洛阳石化污水沉积相中的PAEs含量最高，达到331．70mg／kg,PAEs在干流各断面沉积相中的浓度变化范围为30．52～85．16mg／kg；沿程变化主要受支流的汇入和各处沉积物理化性质的影响．在干流焦巩桥至东明桥区间，悬浮颗粒相的PAEs总量水平沿程呈上升趋势，浓度由40.56mg／kg增至94．22mg／kg。邻苯二甲酸双（2-乙基己基）酯（DEHP）和邻苯二甲酸二丁酯（DBP）所占比例相对较大．干流与支流水相中的DEHP,除孟津和焦巩大桥处未超标，其余各处均己超标．

xSamples of water, sediment and suspended particulates were collected in 12 sections in the middle and lower reaches of the Yellow River. Phthalic acid esters （PAEs） contents in the samples were determined using Gas Chromatogram technique; and their distribution characters in the waters of the Yellow River were analyzed. Between the Xiao Langdi and Dongming Bridge, PAEs concentration in water phase of the main river ranged from 3.99×10^-3 to 45.45×10^-3mg/L; and that of the tributaries ranged from 15.80×10^-3 to 49.53×10^-3mg/L, being much higher than those of the main river. In the studied tributaries, the PAEs contents in sediment phase of the Luoyang petrochemical sewage was the highest, reaching 331.70mg/kg; the variation range of PAEs concentration in sediment phase of the main river was 30.52～85.16mg/kg; this variation along the main river was influenced mainly by the convergence of the tributaries and physical-chemical characteristics of the sediment in each site. The total amount level of PAEs in suspended particulates tended to increase along Jiaogong Bridge to Dongming Bridge areas from 40.56mg/kg to 94.22mg/kg. In the studied phthalic acid esters compounds, the occupied proportions of dl（2-Ethylhexyl） phthalate（DEHP） and di-n-butyl phthalate（DBP） were higher relatively. The concentrations of DEHP exceeded the quality standard in all the main river and tributary stations except these in the Mengjin and Jiaogong Bridge of the main river.