Institute of Marine Sciences and Guangdong Provincial Key Laboratory of Marine Biotechnology, Shantou University, Shantou, 515063, China; The Swire Institute of Marine Science and School of Biological Sciences, the University of Hong Kong, Pokfulam, Hong Kong, China.
The Swire Institute of Marine Science and School of Biological Sciences, the University of Hong Kong, Pokfulam, Hong Kong, China.
Ecotoxicol Environ Saf. 2020 Dec 15;206:111373. doi: 10.1016/j.ecoenv.2020.111373. Epub 2020 Oct 2.
Water quality guidelines and ecological risk assessment of chemical substances like nickel (Ni) in tropical regions such as South East Asia and Melanesia are often based on temperate information as a result of fewer Ni ecotoxicity data available for tropical species. This leaves an unknown margin of uncertainty in the risk assessment in the tropics. In order to fill this data gap, this study was designed to conduct standard toxicity tests on Ni with two freshwater species (acute tests) and three marine species (acute and chronic tests) originated from tropical Hong Kong. All tests were carried out using measured concentrations of Ni with control mortality below 15%. The median lethal concentrations (LCs) were determined as 2520 (95% confidence interval: 2210, 2860) and 426 (351, 515) μg Ni L for the freshwater gastropods Pomacea lineata (48 h) and Sulcospira hainanensis (96 h), respectively, while 96 h LCs of 4300 (3610, 5090), 18,200 (6470, 51,200), 62,400 (56,800, 68,500), and 71,700 (68,200, 75,400) μg Ni L were derived for the marine copepod Tigriopus japonicus, the gastropod Monodonta labio, juvenile and adult of the marine fish Oryzias melastigma, respectively. The chronic effect concentration of 10% (EC) based on the intrinsic rate of increase of the population of T. japonicus was 29 (12, 69) μg Ni L. In terms of growth inhibition, the chronic EC for M. labio was 34 (17, 67) μg Ni L. The results also indicated that T. japonicus in maturation stage (LC: 484 (349, 919) μg Ni L) was less sensitive than its nauplii stage (LC: 44 (27, 72) μg Ni L). This study represents an important addition of high-quality toxicity data to the tropical Ni toxicity database which can be used for future ecological risk assessment of Ni and derivation of its water quality guidelines in tropical regions.
在东南亚和美拉尼西亚等热带地区，水质指南和化学物质（如镍）的生态风险评估通常基于温带地区的信息，因为可供热带物种使用的镍生态毒性数据较少。这使得热带地区的风险评估存在未知的不确定性。为了填补这一数据空白，本研究旨在使用来自热带中国香港的两种淡水物种（急性测试）和三种海洋物种（急性和慢性测试）进行镍的标准毒性测试。所有测试均使用测量浓度的镍进行，对照死亡率低于 15%。确定的半致死浓度（LC）分别为淡水腹足纲Pomacea lineata（48 小时）和 Sulcospira hainanensis（96 小时）的 2520（95%置信区间：2210，2860）和 426（351，515）μg Ni L，而海洋桡足类 Tigriopus japonicus、腹足纲 Monodonta labio、幼鱼和成鱼的 96 小时 LC 分别为 4300（3610，5090）、18200（6470，51200）、62400（56800，68500）和 71700（68200，75400）μg Ni L。海洋鱼类 Oryzias melastigma 的种群增长率为 10%（EC）的慢性效应浓度为 29（12，69）μg Ni L。就生长抑制而言，M. labio 的慢性 EC 为 34（17，67）μg Ni L。结果还表明，处于成熟阶段的 T. japonicus（LC：484（349，919）μg Ni L）比其无节幼体阶段（LC：44（27，72）μg Ni L）的敏感度较低。本研究代表了对热带镍毒性数据库的高质量毒性数据的重要补充，可用于未来对镍的生态风险评估以及热带地区镍水质指南的制定。
