【摘要】 测定了草甸棕壤条件下 ,菲、芘和 1,2 ,4-三氯苯单一与复合污染对蚯蚓的急性致死及亚致死效应。结果表明 ,3种化学品的浓度与蚯蚓死亡率显著相关 (α =0 .0 5 ,r菲 =0 .87,r芘 =0 .85 ,r三氯苯 =0 .95 ) ,与蚯蚓亚致死效应的相关性稍低 (α =0 .0 5 ,r菲 =0 .75 ,r芘 =0 .72 ,r三氯苯 =0 .85 )。蚯蚓个体对 3种有机物毒性的耐受程度差别较大。引起蚯蚓死亡的毒性阈值浓度菲和 1,2 ,4-三氯苯均为 2 0mg·kg-1,芘为 2 0 0 0mg·kg-1;引起蚯蚓体重增长率下降的亚急性毒性阈值浓度分别为菲 2 0mg·kg-1、1,2 ,4-三氯苯 3 0 0mg·kg-1、芘 10 0 0mg·kg-1;LC10 0 分别为菲 10 0mg·kg-1,1,2 ,4-三氯苯 3 5 0mg·kg-1。由于芘的低水溶性和低毒性 ,无法计算LC10 0 。实验还表明 ,复合污染主要表现为协同和拮抗作用更多还原

【Abstract】 The effects of acute toxicity of phenanthrene,pyrene and 1,2,4-trichlorobenzene in single or combined form on earthworms in meadow brown soils were determined.The results indicated that concentration of the three chemicals was significantly related to lethal rate of the earthworms (α=0.05,r PHE=0.87,r PY= 0.85,r TCB=0.95).However,the relationship of pollutant concentration with sub-lethal rate was not as significant as with acute lethal rate (α=0.05,r PHE=0.75,r PY=0.72,r TCB= 0.85).Tolerance of some individual earthworms to the toxicity of some individual pollutants varied greatly.The threshold value causing death of individual earthworm was 20 mg·kg -1 for phenanthrene and 1,2,4-trichlorobenzene,and 2 000 mg·kg -1 for pyrene.The threshold value resulting in weight loss of individual earthworms was 20 mg·kg -1 for phenanthrene,300 mg·kg -1 for 1,2,4-trichlorobenzene, and 1 000 mg·kg -1 for pyrene.LC 100 was 100 mg·kg -1 for phenanthrene and 350 mg·kg -1 for 1,2,4-trichlorobenzene,and non-calculatable for pyrene due to its low water solubility and low toxicity.The experiment also revealed that combined pollution resulted in both synergism and antagonism.更多还原