UnftKi Sttt« Offloi of PMtefctai and Toxfe SufacuncM
Environmental Protection Offie* of PMiddt Program (TS-766C)
Agmcy Wwhington, DC 20460
x°xEPA Pesticide
Fact Sheet
Name of Chemical:
Reason for Issuance:
Date Issued: <**• 3' 1983
Fact Sheet Number: e
1. Description of the chemical:
Generic name: S-ethyl dipropylthiocarbamate
Trade name: ChemollmpeiDw, Eptam*, and Bradi'cane*
EPA Shanghnaaay Coda: 041401
Chmlcal Atecracea Sarriea (CAS) Eeglatry noabar: 759-94-4
Taar of initial ragiatration: 1969
Paacieida Typa: Harbicida
Chamical faaily: Thlocarbaaata
U.S. and Foreign Producer: Stauffer Chemical Company
2. Dae patterns and formula tiona:
Application aitaa: EPTC ia a aelectlve "tbiocarbamate" herbicide wblcb
ia regiatered for oae in preemergent control of certain annual graaaea,
broadleaf veeda and perennial weeda, avcb aa quackgraaa, bermndagraaa»
and nutaedge on field , vegetable* orchard, ornamental and nonerop
aites.
Types of f ormnlationa : EPTC ia available in granular and emolaifiable
liquid concentrate formolationa.
Type* and methoda of application: EPTC must be incorporated in the aoil by
diacing, applied with aubanrface injection equipment, or metered into
irrigation mater to obtain proper weed control. The apecific method of
application and type of equipment are determined by aite, formulation,
and availability of equipment.
Application ratea: 2.0* Iba. a.i./A to 7.0 Iba. a.l./A.
Daual carriers: Water and clay.
3. Science Findings;
try science statement:
EPTC la potentially a strong eye irritant bat it has low acute tori-
cities. Since EPTC is incorporated into the aoil immediately or
just after planting, it will not preaent a hazard to birda and aquatic
organisms. At least two chronic toxicology studies are required to
complete the data base.
Chemical characteristics:
Technical EPTC ia a light yellow liquid. At room temperature, EPTC la
a liquid and it baa an amine odor. EPTC boila at ca 235* C. The
eta leal does not preaent any unusual handling haaarda.
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Toxicological characteristics
Technical EPTC is potentia 1 ly a strong .ye irritant (Toxicity Cate-
gory II). The available data also indicate that technical EPTC has
relatively low acute oral, dernal, and inhalation toxicities, and
low potential for priry derwal irritation.
Studies on buty]ate (a close structural relative of EPTC), as waU as
studies on £PTC itself, have indicated effects of ixpaired clotting
function in test aI ls. Therefore, any additional studies on
EPTC auat include a test for clotting function and h. tology in
the protocol design to better define the effects on clotting and
clearly establish a no obser ed—effectlevel (NOEL).
Acute toxicology studies on TC are as follow,:
Oral LD 50 in rats: 1,632 aaJkg body weight, Toxicity Cat.gory III
Oral LD 50 in nice: 3,160 ag/kg body weight, Toxicity Category I II
I,ik*1 tion LC 50 in rats: 4.3 ag/l, Toxicity Category III
Deral LD 50 in rabbits: 2,750 ag/kg bodywsight, Toxicity Category III
Prisary Eye Irritation in rabbits: severe eye irritant, Toxicity
Category II
Priaary Dereal Irritation in rabbits: aild skin irritant, Toxicity
Category IV.
Chronic toxicology studies on TC are as foLlows:
In a 54-week feeding study of TC in rats: the sOIL was 20 ag/kg/day;
the IlL was 80 ag/kg/day.
In a twa year chronic feeding and oncogenicity study of TC in nice:
the IL was 20 ag/kg/day; the IlL was 80 ag/kg/day and no evidence of
t rig.nicity was found.
General taboliwa: !C studies in nel. and f l. rats wars reviewed
and satisfied the current data requir t 5 for aninel tabol-
Major routes of bian sxpos .:
Current data does not 1nMcate that the U.S. population is exposed to
EPTC through the dietary or non-dietary routes.
by a iologica.l and Biochenical Behavioral Characteristics:
Poliar absorption: EPTC is absorbed stly through the plant roots nith
littl. or no foliar penetration.
Tracalocatiofl: EPTC is readily absorbed by roots and translocated upward
to th. leaves and st .
i h* (s* of pesticide 1 action: rC disrupts the growth of asrist tic
regions of th. leaves and protein synthesis.
Mataboli and Persistence in Plants: EPTC is rapidly .stabolized by
plants to and c ”n plant constituents ( sai’io acids and trncto.e).
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E i O Ut&1 characteristics:
Adsorption and leaching characteristics in basic soil types: EPIC is
adsorbed onto dry soil • The of leaching decreases as clay and
organic eettar increases.
Nicrebikt brsskd : Microbes are the prlaarY factor in the breakdown
of EPTC Lu soils.
Loss f row photod.eoPOsitiOn and/or volatilization: EPIC is readily
lost f row volatilization miess it is iediately incorporated in
the soil at t1 of application.
Awsrage persistence at r.c nded rates: The half hf. of EPIC in
soist lo soil at 21 to 27C is approx1i’ telY one week.
Ecologic*l cbaractarist ice
Avian oral I D 50 : > 26,000ppe,
Avian dietary LC 50 : > 20,000 ppe,
Fish LC 50 : 17.0 ppe to 27.0 ppe,
Probleea with aquatic organisas are not anticipated because an estiwated
.uviro ntal concentration of 0.141 pps in EPIC runoff is well below
the for aquatic organia.
Ths low to city and plae nt of EPIC into the soil i—.diats.ty prior
to or 3ust after planting should reduce exposure and provide an adequate
safety rgin.
Tolerance asses .1nt:
Tolerances are e.tabl.ishad for n.ghigible r.siduss (N) of th. herbicide
S-ethyl dipropyitbioc&rbte Lu or on the following raw agricultural
c. —-ditie.:
Parts p .r 411i
Al.soada, b” 0.1(1)
Mpsragus 0.1(N)
Mans, castor 0.1(N)
Cotton, forags 0.1(N)
Cottonseed 0.1( 1)
P1 seed 0.1(N)
Fruits, citrus 0.1(N)
Fruits, s.aLl 0.1( 1)
Grain crops 0.1(1)
Grasses, forage 0.1( 1)
L.g a. forage 0.1(1)
ts 0.1( 1)
Pineapples 0.1( 1)
Safflower, s 0.1( 1)
Strawberries 0.1( 1)
Sonfl r, seed 0.1(5)
V.getablsa fruiting 0.1(5)
Vegetables, leafy 0.1(N)
Vegetables, root crop 0.1(5)
Vegetables, seed and pod 0.1(N)
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Problene known to hs,e occurred with use:
The Pesticide Incident Monitoring Systee (PDIS) indicated at least
four cases involving EPTC alone f ron 1966 to 1979. In these reports,
agricultural workers such as aixers, loaders and applicators received
dical treatwent after the pesticide contacted their eyes. The
exposures ware caused by equipasut failure, or splashing and resulted
in irritation, swailing, redness, and infltion of the eyes. No
fatalities ware reported. PDIS is a voluntary reporting sy.t and
do... not include detailed follavup or validation of reported
incidents.
4. S —ry of regulatory position and rationale :
U.. classification:
General use classification.
Use, forwulation or geographical restrictions:
No use, forvulation, or geographical restrictions are required.
Uniqun label warning stat nt:
None
Su ry of risk/benefit review:
No risk asses nts ware condiw ted.
5. S& ry of jor data gaps :
The following to cological studies are required within four years
after the receipt of the guidancs package.
A 1—year or longer dog feeding study,
A rat onc g.nicity study,
A teratology study in two specie . ,
A 2—generation reproduction study .
* A teratology study (CDL:247780) aubaitted by Stau.ffer Ch ical Coupany
is pending review by the Agency.
* A reproduction study ( L:249O77) anbaitted by Stau.ffer Ch ica1
Conpany is pending review by the Agency.
Th. requir nt for a subchrontc uaurotoxicity study is being deferred
until an &cut n.urotoxicity study has been cospleted in order to
deterain. wbether the .ubchronic study is necessary. This study
at be suheitted wiPh1vt six south. after receipt of the guidance
package.
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The following .nviro nta.l fat, data are r.quirsd within four y.are
.1 tsr the receipt of the guidance package.
Rydrolysis test,
Pbotod.gradation ts.t in tsr,
Mstabolius teat in anaerobic soil,
Mobility (volatility) teat in the lab,
Dissipation stedy in soil,
Mciulation study in c binod rotational crop..
6. Contact Person at KP* :
Robert J. Taylor
Product Manager (25)
Registration Division (TS-767C)
Pungicidr erbicids Iranch
401 M Str.st, S.W.
Washington, D.C. 20460
(703) 557—1800
DIS Afl 3: The infornatian presented in this Cbical Infornation Pact Sheet
is for inforeatiollal p pos.s only and nay not be used to fulfill data
requirnasuts for pesticide registration and reregistration.
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