Agriculture Reference
In-Depth Information
ent, there are no means for predicting the behavior of multicomponent solu-
tions.
This situation represents a particular problem with regard to pesticides
which are virtually all multicomponent formulations. Research, much of it
sponsored by the EPA, is ongoing in an attempt to better understand the role
of the carrier solvents, surfactants, and other components in the permeation of
the active ingredients. Data from these studies are presented in detail later in
this section.
Table 6.4
Permeation of three two-component mixtures through two glove
materials (U.S. EPA,
Guidance Manual for Selecting Protective Clothing
for Agricultural Pesticide Operations
).
Breakthrough time
(min)
Permeation rate
(mg/m2/sec)
Composition
(A/B)/Vol%
Glove
material
(Thickness,
cm)
A
B
A
B
Methanol/n-
butyl acetate
Nitrile (0.38)
0/100
60
91
10/90
38
39
26
91
25/75
24
28
50
71
50/50
34
38
63
32
75/25
53
> 150
26
<1
90/10
103
> 150
10
<1
100/0
108
4
Methyl ethyl
ketone/hexane
Viton (0.23)
0/100
>200
5/95
150
10/90
39
33
<25
<25
25/75
6
6
55
55
50/50
3
3
330
86
75/25
3
3
670
135
90/10
3
3
1140
63
100/0
3
1100
p-Xylene
/toluene
Nitrile (0.38)
0/100
32
26
25/75
28
25
6
18
50/50
34
32
20
18
75/25
54
54
19
5
100/0
53
27
