作　　者： ; ; ; ;

机构地区： 北京大学城市与环境学院地表过程分析与模拟教育部重点实验室

出　　处： 《环境科学》 2004年第2期115-118,共4页

摘　　要： 以天津地区表土 188个样点的实测萘浓度以及萘对 10种代表性土壤生物的半致死浓度为基础资料 ,尝试用 3种方式评价了该地区土壤中萘的生态风险 .并进行了方法学比较 .研究结果发现 ,暴露浓度和毒性效应概率密度函数的重叠面积与联合概率曲线一致地反映出很低的生态风险 ,准确计算的暴露浓度超过LC50 的概率仅为 1 6 7% .结果说明该地区土壤萘的生态风险极低 ,仅严重污染的局部地区可能发生最敏感生物种受害 .用于进行风险评价的 3种方法各有利弊 . Three approaches were applied and evaluated for probabilistic risk assessment of naphthalene in soils of Tianjin, China, based on the observed naphthalene concentration of 188 top soil samples from the area and LC 50 of naphthalene to ten typical soil fauna species from the literature. It was found that the overlapping area of the two probability density functions of concentration and LC 50 was 6 4%, the joint probability curve bend towards and very close to the bottom and left axis, and the calculated probability that exposure concentration exceeds LC 50 of various species was as low as 1 67%, all indicating a very much acceptable risk of naphthalene to the soil fauna ecosystem and only some of very sensitive species or individual animals are threaten by localized extremely high concentration. The three approaches revealed similar results from different viewpoints.

关 键 词： 生态风险 概率风险评价 土壤 萘

领　　域： [环境科学与工程]