在对1980 年- 2010 年温榆河水环境质量资料分析的基础上, 通过现场调查取样, 分析了温榆河离子特征、水 质变化趋势以及水体与沉积物污染物的相关性。结果表明, 2013 年温榆河Na+ 、Ca2+ 、K+ 、H CO3 - 含量较1980 年- 2006 年呈上升趋势, Cl- 、SO4 2- 呈下降趋势, Mg+ 含量较稳定, 水化学类型由CCa II 转化为CNaI, 河水矿化度呈增大趋 势的同时也向碱化发展。NH4 + 2N 和硝酸盐仍为温榆河及各支流的主要污染物, 超标倍数虽降低, 但依然在2~ 7 倍 范围内, 沉积物重金属中仅Cr 和Cd 地累积指数在0~ 1 之间, 处于轻度污染水平。温榆河北京段水体与沉积物污 染物间相关性显著, 氨氮、硝酸盐以及Cr、Pb 呈显著正相关, Cd、As 呈显著负相关, 其中Pb 的相关性最为显著。

On the basis of data analysis of water envir onmenta l qualit y in Wenyu Riv er f rom 1980 to 2010, t he ion char acter istics, water quality v ariat ion trend, and the co rr elation betw een water and sediment w ere ana lyzed thr ough field sampling. The r esults show ed that( 1) Na+ , Ca2+ , K+ , and HCO3 - contents are higher in 2013 compar ed t o tho se from 1980 to 2006, while Cl- and SO4 2- content s ar e lower in 2013 and M g+ co ntent is r elatively stable in the Wenyu Riv er; ( 2) water chemistry t ype va ries from CCa II to CNaI, indicating an increasing trend o f salinity and alkaline; ( 3) NH4 + 2 N and nitrates are the main po llutants in the We2 nyu River and its tributar y. Although the ov er2standard r atio decreases o ver t he y ears, it is still in the range o f 2 to 7; ( 4) o nly Cr and Cd of the heav y met al in the sediment have the cumulative index betw een 0 and 1, w hich indicates that the sediment pol2 lut ion lev el is light; and( 5) wat er and po llutants in the sediment hav e sig nificant co rr elatio ns in the Weny u River, such t hat NH 4 + 2N and nitr ate show posit ive cor relations w ith Cr and Pb w her eas Cd and As show neg ative cor relations wit h Cr and Pb, and the co rr elatio n wit h Pb is the str ongest.

中国地震局教师科研基金项目( 20130103)