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United States Department of Agriculture

Agricultural Research Service

Methyl Bromide
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1 - Background
2 - Chemical and Physical Properties
3 - Reactions with Stratospheric Ozone
4 - Solubility
5 - Henry's Law Constant
6 - Vapor Pressure
7 - Adsorption
8 - Diffusion Coefficient
9 - Air Sampling
10 - Field Experiments
11 - Transformation of MeBr in Water
12 - Transformation of MeBr in Soil
13 - Transport Model
14 - Simulating MeBr Volatilization
15 - Fumigation
16 - Post-Fumigation
17 - Further Reading
Henry's Law Constant
 
It is known that the movement of a volatile chemical in soil is controlled by its distribution behavior over the soil–water–air phases. The reported Kh for MeBr at 20 EC varies from 0.24 to 0.30 (Siebering and Leistra, 1978; Gan and Yates, 1996), and changes with temperature. With a Kh of this magnitude, it can be expected that the movement of MeBr in unsaturated soil is mainly driven by its diffusion via the vapor phase (soil air). The temperature dependence of the Henry's Law constant for MeBr is shown in Figure 1, including Arrhenius equations and fitted parameters.
 
Figure 1. Henry’s Law Constant for Methyl Bromide as a function of temperature
Henry's Law Constant
 
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Last Modified: 10/20/2005
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