金鱼(Carassiusauratus)鳃对颗粒吸附态铅的吸收

应用生态学报 ›› 2000, Vol. ›› Issue (2): 283-286.

金鱼(Carassiusauratus)鳃对颗粒吸附态铅的吸收

刘长发¹, 陶澍¹, 曹军¹, 李本纲¹, 林健枝²

1. 北京大学城市与环境学系, 北京100871;
2. 香港中文大学地理系, 香港

收稿日期:1998-10-19 修回日期:1999-04-19 出版日期:2000-03-25
通讯作者: 陶澍
基金资助:
国家杰出青年基金资助项目(49525102)

Uptake of particulate lead via gills of goldfish

LIU Changfa¹, TAO Shu¹, CAO Jun¹, LI Bengang¹, Lam Kin Che²

1. Department of Urban and Environmental Sciences, Peking University, Beijing 100871;
2. Department of Geography, Chinese University of Hong Kong, Hong Kong

Received:1998-10-19 Revised:1999-04-19 Online:2000-03-25

摘要/Abstract

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0.343),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 (0.0039)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.

关键词: 铅, 金鱼, 颗粒态, 生物有效性

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.

Key words: Lead, Goldfish, Particulate lead, Bioavailability

刘长发, 陶澍, 曹军, 李本纲, 林健枝. 金鱼(Carassiusauratus)鳃对颗粒吸附态铅的吸收[J]. 应用生态学报, 2000, (2): 283-286.

LIU Changfa, TAO Shu, CAO Jun, LI Bengang, Lam Kin Che. Uptake of particulate lead via gills of goldfish[J]. Chinese Journal of Applied Ecology, 2000, (2): 283-286.

参考文献

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