DT 50

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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

Individual evidence

  1. 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. @1@ 2Template: Webachiv / IABot / www.bvl.bund.de
  2. 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.