標題: Metal toxicity to Chlorella pyrenoidosa assessed by a short-term continuous test
作者: Lin, Kuo-Ching
Lee, Yu-Long
Chen, Chung-Yuan
環境工程研究所
Institute of Environmental Engineering
關鍵字: toxicity;algae;Chlorella pyrenoidosa;EC50;NOEC
公開日期: 2-Apr-2007
摘要: This study presents the metal toxicity as revealed by Chlorella pyrenoidosa using a short-term continuous test and the conventional batch test. Toxicity tests were conducted in a chemostat with a test duration of I day. Toxicity data of five different metals (Cd, Ph, Co, Ni, and Zn) derived from the continuous test were compared against results from the conventional batch tests. The batch test is characterized by its saturated nutrient status for algal growth and, on the other hand, the continuous test is conducted at a nutrient-limiting condition simulating more closely to the aquatic field environment. The continuous test consistently yielded smaller EC50 values, which indicated that alga in the chemostat is approximately four to six times more sensitive than those from the batch culture. Similar phenomena between the two types of tests were observed based on the NOEC values. Compared to literature data (US EPA ECOTOX Database) from the same species of alga, differences in test sensitivity between the batch tests and chemostat technique varied from 9.25 to 160 times. Such distinct differences indicate that current toxicity database may not adequately reflect the impact of various metal toxicants on C. pyrenoidosa. The continuous test method presented herein is a sensitive and rapid assessment technique and, therefore, has a potential for more general applications such as routine checkup for regulatory purposes. (c) 2006 Published by Elsevier B.V.
URI: http://dx.doi.org/10.1016/j.jhazmat.2006.08.009
http://hdl.handle.net/11536/10935
ISSN: 0304-3894
DOI: 10.1016/j.jhazmat.2006.08.009
期刊: JOURNAL OF HAZARDOUS MATERIALS
Volume: 142
Issue: 1-2
起始頁: 236
結束頁: 241
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