【摘要】 研究了金鱼 (Carassiusauratus)鳃在悬浮水铝矿吸附态Pb暴露实验中对Pb吸收过程 .结果表明 ,在保持水中游离态Pb浓度不变 ( 0 1mg·L-1)、吸附态Pb浓度增加的条件下 ,鳃中Pb、Al浓度均随暴露浓度增加而增加 ,血液中Pb浓度随鳃中Pb浓度的增加率 (直线斜率 0 171)低于溶解态Pb暴露实验的增加率 (直线斜率0 3 4 3 ) ,附着在鳃上的部分Pb未转移至血液中 ,鳃中Pb/Al比较水相Pb/Al比 ( 0 0 0 3 9)高 1～ 2个数量级 ,并且在组织切片中观察到积聚在粘液上的矿物颗粒 ,从而证实了颗粒态Pb对鱼鳃吸收的生物有效性 .金鱼鳃吸收颗粒态Pb的主要机理是 :流经鳃丝表面的悬浮颗粒物吸附态Pb在鳃表面解离并被动扩散或载体转运穿过鳃部细胞进入血液循环 ,颗粒物在鳃丝表面短时间停留后与脱落粘液一起随水流从鳃部排出更多还原

【Abstract】 This paper studied the uptake of Pb absorbed on suspended gibbsite via gills of goldfish ( Carassius auratus). Under conditions of the concentration of the particulate Pb varied while that of free Pb maintained at a constant level,the levels of both Pb and Al in the gills increased with increasing exposed Pb concentration.The increasing rate (slope 0\^171) of Pb level in the blood with the Pb level in the gills was lower than that (slope 0\^343) of soluble Pb exposure experiment.Partial Pb adhered on the gills did not transfer into blood.The ratio of Pb/Al in the gills was 1～2 orders of magnitude higher than that in the water,and on the microtome section of filament, the gibbsite particles adhered on gill mucus were observed, indicating the bioavailability of the particulate Pb uptake by the gills of goldfish.The major mechanism was: when the absorbed Pb on suspended particles was flowed into gill filaments,it was desorbed on the surface of gills,and then, passively diffused or transferred by carriers via gill cells into flood,and after the particles stayed on the surface of gill filaments for a short time,in company with sloughed mucus,they were released from the gills along with waterflow.更多还原