A Review on the Environmental Behavior of the Polyoxyethylene Type Nonionic Surfactants Adjuvants in Pesticides

• Main Authors: KONG Xiang-ji, WEI Xiao, WANG Na, BU Yuan-qing, SHAN Zheng-jun
• Format: Article
• Language: zho
• Published: Agro-Environmental Protection Institute, Ministry of Agriculture 2017-05-01
• Series: Journal of Agricultural Resources and Environment
• Subjects: nonionic surfactants; environmental distribution; biodegradation
• Online Access: http://www.aed.org.cn/nyzyyhjxb/html/2017/3/20170301.htm

Polyoxyethylene type nonionic surfactants such as alkylphenol ethoxylates(APEOs), alcohol ethoxylates(AEOs) and alkylamine ethoxylates(ANEOs) are typical pesticide adjuvants. Their unique environmental behavior characteristic is reflected in the parameters describing the fate e.g.distribution coefficient, adsorption to soil, degradation and effects of these substances. The major environmental problem related to these compounds is their part metabolites' relatively higher environmental risk. In views of their chemical structure, this paper outlined present knowledge on occurrence, fate and environment effect of the three adjuvants:AEOs, ANEOs and APEOs. The adsorption behaviour of ANEOs in contrast to AEOs was particularly variable and matrix dependent due to the ability of the compound to ionise at environmentally relevant pH. Probably because the compounds exceeded high soil adsorption and were easily degradable which were reflected in the low environmental concentrations generally found in monitoring studies.