6/
26/
01
MEMORANDUM
SUBJECT:
Diuron.
List
A
Reregistration
Case
0046.
PC
Code
035505.
Product
Chemistry
Chapter
for
the
Reregistration
Eligibility
Decision
[
RED]
Document.
DP
Barcode
D274489.

FROM:
K.
Dockter,
Chemist
Reregistration
Branch
2
Health
Effects
Division
[
7509C]

THRU:
Alan
Nielsen,
Branch
Senior
Scientist
Reregistration
Branch
2
Health
Effects
Division
[
7509C]

TO:
Diana
Locke,
Ph.
D.,
Risk
Assessor
Reregistration
Branch
2
Health
Effects
Division
[
7509C]

Diuron
[
3­(
3,4­
dichlorophenyl)­
1,1­
dimethylurea]
is
registered
for
selective
and
total
weed
control
in
crops
such
as:
alfalfa,
asparagus,
citrus,
cotton,
orchards,
sugar
cane,
wheat,
and
vineyards.

Empirical
formula:
C
9H10Cl
2N2O
Molecular
weight:
233.1
CAS
Registry
No.:
330­
54­
1
PC
Code:
035505
Chemical
structure
by
J.
Punzi
2
A
search
of
REFS
conducted
4/
26/
01
identified
95
active
diuron
products;
6
of
which
are
technicals
or
manufacturing
use
products,
which
are
subject
to
a
RED.
They
are
identified
in
Table
1.

Table
1.
Technical
Diuron
Active
Products
EPA
Reg.
No.
CSF*
Date
Registrant
Product
Name
%
a.
i.

1812­
4121
10/
30/
97
Griffin
L.
L.
C.
Dupont
Diuron
Technical
Herbicide
98.4
19713­
66
2/
15/
95
Drexel
Chml.
Co.
Drexel
Diuron
Technical
98.0
19713­
2752
1/
6/
89
"
Diuron
Technical
97.

67640­
XX(
E)
2
10/
24/
95
Sanachem
U.
S.
A.,
Inc.
"
98.8
12020­
1
8/
26/
86
Staveley
Chmls.
Ltd.
"
99.25
46120­
13
1/
26/
84
United
Phosphorus
Europe
Ltd.
"
Herbicide
98
*
Confidential
Statement
of
Formula.

1
Transferred
from
Dupont
352­
324
on
4/
8/
98.

2
Transferred
from
IDA,
INC.
45115­
27
CSF
dated
1/
6/
89,
RD
scanned
4/
15/
92.

3
Transferred
from
Aceto
Agric.
Chmls.
Corp.
2749­
58
on
5/
24/
90.

The
product
chemistry
data
base
is
not
complete;
new
CSFs
are
required
which
reflect
preliminary
analyses
of
current
products
together
with
discussions
of
formation
of
impurities.
The
available
Generic
Series
830
physical
and
chemical
properties
are
given
in
Table
2.
3
Table
2.
Generic
Series
830
Physical
and
Chemical
Properties
GLN
MRID
Data
6302
Color
net1
white
6303
Physical
state
"
crystal
6304
Odor
"
none
7200
MP
"
158­
9
C
7840
Water
solubility
"
42
ppm
@
25
C
7950
vp
"
2x10­
7
mm
Hg
@
30
C
7550
Log
Pow
2
2.68
6320
Corrosion
characteristics
43842201
not
corrosive
6313
Stability
to
normal
and
elevated
temperatures,
metals,
and
metal
ions
"
stable
for
2
Yrs.
in
double
polyethylene
bag
inside
a
fiber
drum
under
warehouse
conditions.
Metals
and
metal
ion
data
not
given.

7050
UV/
Visible
absorption
NG
NG:
Not
Given.

Bibliography
1
Diuron.
CASRN:
330­
54­
1.
http://
toxnet.
nlm.
nih.
gov/
egi­
bin/
sis/
search.

2
Reddy,
K.
N.
and
M.
A.
Locke.
1996.
Molecular
Properties
as
Descriptors
of
Octanol­
Water
Partition
Coefficients
of
Herbicides.
Water,
Air
and
Soil
Pollution
Vol.
86:
pp
389­
405.

cc:
Reg.
Std.
F,
SF,
RF,
Dockter,
J.
Punzi,
R.
Sandvig,
C.
Jarvis,
Y.
Yang,
R.
Allen.
RD\
I
Diuron
RED
Team.
7509C:
RRB2:
Rm712G:
57886:
KD/
kd
Diuron
RED
[
983Sr8]
=
D274489.
mem.
