Predicting the Time-dependent Toxicities of Three Triazine Herbicide Mixtures to V. qinghaiensis sp. Q67 Using the Extended Concentration Addition Model

doi:10.6023/A13101034

Acta Chimica Sinica ›› 2014, Vol. 72 ›› Issue (1): 56-60.DOI: 10.6023/A13101034 Previous Articles Next Articles

Article

拓展浓度加和模型预测三种三嗪类除草剂混合物的时间依赖毒性

王猛超, 刘树深, 陈浮

同济大学环境科学与工程学院长江水环境教育部重点实验室上海 200092

投稿日期:2013-10-08 发布日期:2013-12-17
通讯作者: 刘树深，E-mail：ssliuhl@263.net E-mail:ssliuhl@263.net
基金资助:
项目受国家自然科学基金（Nos. 21177097，20977065）和高等学校博士学科点专项科研基金（No. 20120072110052）资助.

Predicting the Time-dependent Toxicities of Three Triazine Herbicide Mixtures to V. qinghaiensis sp. Q67 Using the Extended Concentration Addition Model

Wang Mengchao, Liu Shushen, Chen Fu

Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092

Received:2013-10-08 Published:2013-12-17
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 21177097, 20977065) and the Specialized Research Fund for the Doctoral Program of Higher Education (No. 20120072110052).

1. Predicting the Time-dependent Toxicities of Three Triazine Herbicide Mixtures to V. qinghaiensis sp. Q67 Using the Extended Concentration Addition Model.PDF(256KB)

Abstract

The concentration addition (CA) model is a common model for the evaluation and prediction of mixture toxicity and has been widely used in many mixture systems such as drug combination and pesticide mixtures. However, it is necessary to extend the CA so that it is applicable in the mixture systems including components with different effects in different times. In this paper, three triazine herbicides, metribuzin (MET), simetryn (SIM) and hexazinone (HEX), which have different characteristics of the time-dependent toxicity, were selected as mixture components and their binary mixtures were designed by using the direct equipartition ray design (EquRay). Taking V. qinghaiensis sp.-Q67 as test organism and 96-well microplate as exposure experiment carrier, the luminescence inhibition toxicities of three triazine herbicides and their binary mixtures were determined at six different time points (0.25, 2, 4, 8, 12 and 16 h). The fluctuation tendency of the luminescence inhibition toxicity varying with time was analyzed. The results show that the inhibition toxicities of three triazine herbicides to V. qinghaiensis sp.-Q67 have different characteristics of the time-dependent toxicity, i.e., the toxicity of MET apparently increases over time, while that of SIM is basically a constant in the range of testing time, but that of HEX first increases with time at the beginning stage and then is basically unchanged. Also, the toxicities of the binary mixtures consisting of three herbicides depend on not only the composition of the mixtures but also the concentration ratio of various components. The toxicity of binary mixture consisting of MET and HEX gradually increases over time, and that of binary MET-SIM mixture at first decreases and then slowly increases, while the toxicity change is not significant in the SIM-HEX mixture system. Moreover, all the toxicities of binary mixtures can be effectively predicted by the CA model which had been extended by regarding the concentration of no-effect component as infinity, being additive, not synergistic or antagonistic.

Key words: concentration addition, chemical mixtures, EquRay, triazine herbicides, time-dependent toxicity

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Wang Mengchao, Liu Shushen, Chen Fu. Predicting the Time-dependent Toxicities of Three Triazine Herbicide Mixtures to V. qinghaiensis sp. Q67 Using the Extended Concentration Addition Model[J]. Acta Chimica Sinica, 2014, 72(1): 56-60.

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拓展浓度加和模型预测三种三嗪类除草剂混合物的时间依赖毒性

Predicting the Time-dependent Toxicities of Three Triazine Herbicide Mixtures to V. qinghaiensis sp. Q67 Using the Extended Concentration Addition Model

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