N
Cl
Cl
O
N
O
10­
01­
01
MEMORANDUM
SUBJECT:
Linuron.
List
A
Reregistration
Case
0047.
PC
Code
035506.
Product
Chemistry
Chapter
for
the
Tolerance
Renewal
Eligibility
Decision
[TRED]
Document.
DP
Barcode
D273274.

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:
Carol
Christensen,
Risk
Assessor
Reregistration
Branch
2
Health
Effects
Division
[7509C]

Linuron
[3­(
3,4­
dichlorophenyl)­
1­
methoxy­
1­
methylurea]
is
registered
for
selective
weed
control
in
many
crops,
and
on
roadsides,
and
fence
rows.

Empirical
formula:
C9H10Cl2N2O2
Molecular
weight:
249.1
CAS
Registry
No.:
330­
55­
2
PC
Code:
035506
Chemical
structure
by
J.
Punzi
The
Reregistration
Standard
[RS]
issued
6/
30/
82,
the
Guidance
6/
29/
84,
&
the
Update
[U]
6/
20/
90.

The
Reregistration
Eligibility
Decision
Document
issued
3/
96.

A
search
of
REFS
conducted
9/
25/
01
identified
26
active
products,
5
of
which
are
technicals
[Ts]
subject
to
a
TRED.
The
Ts
are
identified
in
Table
1.

Table
1.
Technical
Linuron
Active
Products
EPA
Reg.
No.
Registrant
Product
Name
%
a.
i.
CSF
Date
1812­
270
Griffin
Corp.
Griffin
Linuron
Technical
96.25
9/
28/
90
1812­
411
"
L.
L.
C.
DuPont
Linuron
Flake
Technical
97.0
12/
20/
95
19713­
158
Drexel
Chml.
Co.
Drexel
"
"
"
95
10/
1/
98
"
­367
"
"
Linuron
Technical
I
95.0
1/
4/
99
"
­368
"
"
"
"
II
"
10/
1/
98
The
product
chemistry
data
base
is
complete.
The
Series
830
physical
and
chemical
properties
are
given
in
the
table
below.

GLN
MRID
Data
6302
Color
460023­
045
off­
white
to
light
tan
6303
Physical
state
"
solid
6304
Odor
"
odorless
7200
MP
"
93
­
94
C
7300
Bulk
density
"
1.45
g/
cc
7840
Water
solubility
"
75
ppm
@
25
C
7950
vp
"
1.5
x
10
­5
mm
Hg
@
24
C
7550
log
Pow
"
2.76
6313
Stability
"
stable
up
to
MP;
stable
at
concentrations
of
5
&
5000
ppm
in
aqueous
buffers
[pH
5,
7,
&
9]
for
30
days
@
20
C.

cc:
RF,
Dockter,
C.
Christensen,
J.
Punzi,
R.
Fricke.
RD\
I
RRB2
Linuron
TRED
Team.
7509C:
RRB2:
Rm712N:
57886:
KD/
kd
Linuron.
TRED
[987]
=
D273274.
mem.
