Boxmeyer C E, Leach S, Palchick S M
Metropolitan Mosquito Control District, St. Paul, MN 55104, USA.
J Am Mosq Control Assoc. 1997 Sep;13(3):275-7.
Incomplete degradation of control products and subsequent carryover of active ingredient to the next year are operational concerns for control agencies. Altosid XR briquets were weighed before and after 6-18 months of exposure in temporary wetlands to determine the rate of physical degradation of the briquets. Degradation rate was influenced mainly by the number of days a briquet remained under water. The average briquet degraded to 19% of its weight within 150 days of immersion and was completely degraded after 1.5 yr under water. The active ingredient (methoprene) content of briquets declined faster among those exposed to air and more slowly among those that were immersed.
对照产品的不完全降解以及活性成分随后遗留至下一年，是控制机构在操作方面所关切的问题。对Altosid XR压块在临时湿地中暴露6至18个月前后进行称重，以确定压块的物理降解速率。降解速率主要受压块在水下停留天数的影响。平均而言，压块在浸泡150天内降解至其重量的19%，在水下1.5年后完全降解。暴露于空气中的压块中活性成分（烯虫酯）含量下降得更快，而浸泡在水中的压块中活性成分含量下降得更慢。
