*** CHEMICAL IDENTIFICATION ***
RTECS NUMBER : XZ2990000
CHEMICAL NAME : as-Triazin-5(4H)-one,
4-amino-6-tert-butyl-3-(methylthio)-
CAS REGISTRY NUMBER : 21087-64-9
BEILSTEIN REFERENCE NO. : 0746650
REFERENCE : 5-26-06-00432 (Beilstein Handbook Reference)
LAST UPDATED : 199712
DATA ITEMS CITED : 34
MOLECULAR FORMULA : C8-H14-N4-O-S
MOLECULAR WEIGHT : 214.32
WISWESSER LINE NOTATION : T6NN DNVJ CS1 DZ FX1&1&1
COMPOUND DESCRIPTOR : Agricultural Chemical
Mutagen
Reproductive Effector
SYNONYMS/TRADE NAMES :
* 4-Amino-6-tert-butyl-3-methylthio-as-triazin-5-one
* 4-Amino-6-tert-butyl-3-(methylthio)-1,2,4-triazin-5-one
* 4-Amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one
* BAY 61597
* BAY dic 1468
* Bayer 94337
* Bayer 6159H
* Bayer 6443H
* DIC 1468
* Lexone
* Lexone DF
* Lexone 4L
* Metribuzin
* NTN 70
* Sencor
* Sencor 4
* Sencoral
* Sencor DF
* Sencorer
* Sencorex
* 1,2,4-Triazin-5-one, 4-amino-6-tert-butyl-3-(methylthio)-
* 1,2,4-Triazin-5(4H)-one, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-
* Zenkor
*** HEALTH HAZARD DATA ***
** ACUTE TOXICITY DATA **
TYPE OF TEST : LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE : Oral
SPECIES OBSERVED : Rodent - rat
DOSE/DURATION : 1100 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
FMCHA2 Farm Chemicals Handbook. (Meister Pub., 37841 Euclid Ave.,
Willoughy, OH 44094) Volume(issue)/page/year: -,C204,1991
TYPE OF TEST : LC50 - Lethal concentration, 50 percent kill
ROUTE OF EXPOSURE : Inhalation
SPECIES OBSERVED : Rodent - rat
DOSE/DURATION : >860 mg/m3/4H
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
NNGADV Nippon Noyaku Gakkaishi. Journal of the Pesticide Science Society of
Japan. (Nippon Noyaku Gakkai, 1-43-11, Komagome, Toshima-ku, Tokyo 170,
Japan) V.1- 1976- Volume(issue)/page/year: 12,127,1987
TYPE OF TEST : LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE : Administration onto the skin
SPECIES OBSERVED : Rodent - rat
DOSE/DURATION : 2 gm/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
85JCAE "Prehled Prumyslove Toxikologie; Organicke Latky," Marhold, J.,
Prague, Czechoslovakia, Avicenum, 1986 Volume(issue)/page/year: -,1001,1986
TYPE OF TEST : LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE : Intraperitoneal
SPECIES OBSERVED : Rodent - rat
DOSE/DURATION : 239 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
NNGADV Nippon Noyaku Gakkaishi. Journal of the Pesticide Science Society of
Japan. (Nippon Noyaku Gakkai, 1-43-11, Komagome, Toshima-ku, Tokyo 170,
Japan) V.1- 1976- Volume(issue)/page/year: 12,127,1987
TYPE OF TEST : LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE : Subcutaneous
SPECIES OBSERVED : Rodent - rat
DOSE/DURATION : 814 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
NNGADV Nippon Noyaku Gakkaishi. Journal of the Pesticide Science Society of
Japan. (Nippon Noyaku Gakkai, 1-43-11, Komagome, Toshima-ku, Tokyo 170,
Japan) V.1- 1976- Volume(issue)/page/year: 12,127,1987
TYPE OF TEST : LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE : Oral
SPECIES OBSERVED : Rodent - mouse
DOSE/DURATION : 564 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
NNGADV Nippon Noyaku Gakkaishi. Journal of the Pesticide Science Society of
Japan. (Nippon Noyaku Gakkai, 1-43-11, Komagome, Toshima-ku, Tokyo 170,
Japan) V.1- 1976- Volume(issue)/page/year: 12,127,1987
TYPE OF TEST : LC - Lethal concentration
ROUTE OF EXPOSURE : Inhalation
SPECIES OBSERVED : Rodent - mouse
DOSE/DURATION : >860 mg/m3/4H
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
85INA8 "Documentation of the Threshold Limit Values and Biological Exposure
Indices," 5th ed., Cincinnati, OH, American Conference of Governmental
Industrial Hygienists, Inc., 1986 Volume(issue)/page/year: 6,1042,1991
TYPE OF TEST : LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE : Administration onto the skin
SPECIES OBSERVED : Rodent - mouse
DOSE/DURATION : >1 gm/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
NNGADV Nippon Noyaku Gakkaishi. Journal of the Pesticide Science Society of
Japan. (Nippon Noyaku Gakkai, 1-43-11, Komagome, Toshima-ku, Tokyo 170,
Japan) V.1- 1976- Volume(issue)/page/year: 12,127,1987
TYPE OF TEST : LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE : Intraperitoneal
SPECIES OBSERVED : Rodent - mouse
DOSE/DURATION : 210 mg/kg
TOXIC EFFECTS :
Behavioral - somnolence (general depressed activity)
REFERENCE :
PCBPBS Pesticide Biochemistry and Physiology. (Academic Press, Inc., 1 E.
First St., Duluth, MN 55802) V.1- 1971- Volume(issue)/page/year:
23,123,1984
TYPE OF TEST : LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE : Subcutaneous
SPECIES OBSERVED : Rodent - mouse
DOSE/DURATION : 367 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
NNGADV Nippon Noyaku Gakkaishi. Journal of the Pesticide Science Society of
Japan. (Nippon Noyaku Gakkai, 1-43-11, Komagome, Toshima-ku, Tokyo 170,
Japan) V.1- 1976- Volume(issue)/page/year: 12,127,1987
TYPE OF TEST : LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE : Oral
SPECIES OBSERVED : Mammal - cat
DOSE/DURATION : >500 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
85JFAN "Agrochemicals Handbook," with updates, Hartley, D., and H. Kidd,
eds., Nottingham, Royal Soc. of Chemistry, 1983-86 Volume(issue)/page/year:
A280,1983
TYPE OF TEST : LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE : Administration onto the skin
SPECIES OBSERVED : Rodent - rabbit
DOSE/DURATION : >20 gm/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
FMCHA2 Farm Chemicals Handbook. (Meister Pub., 37841 Euclid Ave.,
Willoughy, OH 44094) Volume(issue)/page/year: -,C204,1991
TYPE OF TEST : LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE : Oral
SPECIES OBSERVED : Rodent - guinea pig
DOSE/DURATION : 250 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
85DPAN "Wirksubstanzen der Pflanzenschutz und Schadlingsbekampfungsmittel,"
Perkow, W., Berlin, Verlag Paul Parey, 1971-1976 Volume(issue)/page/year:
-,-,1971/1976
TYPE OF TEST : LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE : Oral
SPECIES OBSERVED : Bird - quail
DOSE/DURATION : 164 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
PEMNDP Pesticide Manual. (The British Crop Protection Council, 20 Bridport
Rd., Thornton Heath CR4 7QG, UK) V.1- 1968- Volume(issue)/page/year:
8,573,1987
TYPE OF TEST : LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE : Unreported
SPECIES OBSERVED : Bird - quail
DOSE/DURATION : 168 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
FMCHA2 Farm Chemicals Handbook. (Meister Pub., 37841 Euclid Ave.,
Willoughy, OH 44094) Volume(issue)/page/year: -,C204,1991
** OTHER MULTIPLE DOSE TOXICITY DATA **
TYPE OF TEST : TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE : Oral
SPECIES OBSERVED : Rodent - rat
DOSE/DURATION : 64800 ug/kg/15W-C
TOXIC EFFECTS :
Brain and Coverings - other degenerative changes
REFERENCE :
JTEHD6 Journal of Toxicology and Environmental Health. (Hemisphere Pub.,
1025 Vermont Ave., NW, Washington, DC 20005) V.1- 1975/76-
Volume(issue)/page/year: 30,209,1990
TYPE OF TEST : TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE : Oral
SPECIES OBSERVED : Rodent - rat
DOSE/DURATION : 4550 mg/kg/26W-I
TOXIC EFFECTS :
Immunological Including Allergic - increased immune response
REFERENCE :
GISAAA Gigiena i Sanitariya. For English translation, see HYSAAV. (V/O
Mezhdunarodnaya Kniga, 113095 Moscow, USSR) V.1- 1936-
Volume(issue)/page/year: 52(11),76,1987
TYPE OF TEST : TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE : Oral
SPECIES OBSERVED : Rodent - rat
DOSE/DURATION : 13140 mg/kg/2Y-C
TOXIC EFFECTS :
Nutritional and Gross Metabolic - weight loss or decreased weight gain
REFERENCE :
NNGADV Nippon Noyaku Gakkaishi. Journal of the Pesticide Science Society of
Japan. (Nippon Noyaku Gakkai, 1-43-11, Komagome, Toshima-ku, Tokyo 170,
Japan) V.1- 1976- Volume(issue)/page/year: 12,127,1987
TYPE OF TEST : TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE : Oral
SPECIES OBSERVED : Mammal - dog
DOSE/DURATION : 27375 mg/kg/2Y-C
TOXIC EFFECTS :
Kidney, Ureter, Bladder - changes in tubules (including acute renal failure,
acute tubular necrosis)
Nutritional and Gross Metabolic - weight loss or decreased weight gain
Related to Chronic Data - death
REFERENCE :
NNGADV Nippon Noyaku Gakkaishi. Journal of the Pesticide Science Society of
Japan. (Nippon Noyaku Gakkai, 1-43-11, Komagome, Toshima-ku, Tokyo 170,
Japan) V.1- 1976- Volume(issue)/page/year: 12,127,1987
** REPRODUCTIVE DATA **
TYPE OF TEST : TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE : Oral
SPECIES OBSERVED : Rodent - rat
DOSE : 1 gm/kg
SEX/DURATION : female 6-15 day(s) after conception
TOXIC EFFECTS :
Reproductive - Effects on Embryo or Fetus - extra-embryonic structures
(e.g., placenta, umbilical cord)
REFERENCE :
NNGADV Nippon Noyaku Gakkaishi. Journal of the Pesticide Science Society of
Japan. (Nippon Noyaku Gakkai, 1-43-11, Komagome, Toshima-ku, Tokyo 170,
Japan) V.1- 1976- Volume(issue)/page/year: 12,127,1987
*** REVIEWS ***
ACGIH TLV-Not classifiable as a human carcinogen
DTLVS* The Threshold Limit Values (TLVs) and Biological Exposure Indices
(BEIs) booklet issues by American Conference of Governmental Industrial
Hygienists (ACGIH), Cincinnati, OH, 1996 Volume(issue)/page/year:
TLV/BEI,1997
ACGIH TLV-TWA 5 mg/m3
DTLVS* The Threshold Limit Values (TLVs) and Biological Exposure Indices
(BEIs) booklet issues by American Conference of Governmental Industrial
Hygienists (ACGIH), Cincinnati, OH, 1996 Volume(issue)/page/year:
TLV/BEI,1997
*** U.S. STANDARDS AND REGULATIONS ***
EPA FIFRA 1988 PESTICIDE SUBJECT TO REGISTRATION OR RE-REGISTRATION
FEREAC Federal Register. (U.S. Government Printing Office, Supt. of
Documents, Washington, DC 20402) V.1- 1936- Volume(issue)/page/year:
54,7740,1989
*** OCCUPATIONAL EXPOSURE LIMITS ***
OEL-AUSTRALIA:TWA 5 mg/m3 JAN 1993
OEL-BELGIUM:TWA 5 mg/m3 JAN 1993
OEL-DENMARK:TWA 5 mg/m3 JAN 1993
OEL-FRANCE:TWA 5 mg/m3 JAN 1993
OEL-THE NETHERLANDS:TWA 5 mg/m3 JAN 1993
OEL IN BULGARIA, COLOMBIA, JORDAN, KOREA check ACGIH TLV
OEL IN NEW ZEALAND, SINGAPORE, VIETNAM check ACGIH TLV
*** NIOSH STANDARDS DEVELOPMENT AND SURVEILLANCE DATA ***
NIOSH RECOMMENDED EXPOSURE LEVEL (REL) :
NIOSH REL TO METRIBUZIN-air:10H TWA 5 mg/m3
REFERENCE :
NIOSH* National Institute for Occupational Safety and Health, U.S. Dept. of
Health, Education, and Welfare, Reports and Memoranda.
Volume(issue)/page/year: DHHS #92-100,1992
*** STATUS IN U.S. ***
EPA GENETOX PROGRAM 1988, Negative: S cerevisiae gene conversion
On EPA IRIS database
EPA TSCA TEST SUBMISSION (TSCATS) DATA BASE, JUNE 1998
*** END OF RECORD ***