DT 50
The DT 50 value is a quantitative measure of the speed of degradation of pesticides in the environment .
DT stands for dissipation time (Engl. To dissipate = dissolve , erode ) or disappearance time (Engl. To disappear = disappear , be lost ), the number 50 represents a reduction of the amount originally present by 50%. A DT 50 value thus corresponds to the half-life . A DT 90 value accordingly indicates a 90% decrease in the starting material.
Verbal classification
Based on the DT 50 value, the degradability of pesticides in the environment can also be classified verbally:
DT 50 value | verbal classification |
---|---|
<5 days | very easily degradable |
5–21 days | easily degradable |
22-60 days | moderately degradable |
> 60 days | difficult to degrade |
Web links
- bvl.bund.de: Fate of pesticides in the environment
Individual evidence
- ↑ bvl.bund.de: Fate of pesticides in the environment ( Memento of the original from April 12, 2015 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. , accessed April 6, 2015.
- ↑ JM Hollis: Mapping the vulnerability of aquifers and surface waters to pesticide contamination at the national / regional scale. In: A. Walker: Pesticides in Soils and Water, Current Perspectives. British Crop Protection Monograph, 47, 1991, pp. 165-174.