21725-46-2 Usage
Chemical Properties
Cyanazine is an off-white to tan crystalline
solid. Molecular
. Hazard identification (based on NFPA-704 M
Rating System): Health 2, flammability 1, reactivity 0.
Soluble in water. Physical properties may be altered by car-
rier solvents used in commercial formulations.
Uses
Different sources of media describe the Uses of 21725-46-2 differently. You can refer to the following data:
1. Selective pre-emergence herbicide.
2. Selective pre- and postemergence herbicide to
control weeds in crops such as alfalfa, corn, cotton,
sorghum, soybeans, and wetland.
3. Herbicide used for control of annual grasses and broad-leaved weeds in cereals,
cotton, maize, onions, peanuts, peas, potatoes, soybeans, sugarcane and wheat fallow
General Description
Colorless crystals. Non corrosive when dry. Used as a selective systemic herbicide.
Air & Water Reactions
Stable at pHs between 5.0 and 9.0, but is hydrolyzed by strong acids and bases.
Reactivity Profile
A triazine derivative.
Hazard
Very toxic.
Agricultural Uses
Herbicide: On August 2, 1995, the U.S. EPA announced a voluntary phase-out of the use of cyanazine. On January 6,
2000, the U.S. EPA announced the cancellation of all cyanazine registrations. It had been A U.S. EPA restricted Use
Pesticide (RUP) because of its teratogenicity and because it
has been found in groundwater. Not approved for use in EU
countries. Cyanazine is used as a pre-and post-emergent
herbicide to control annual grasses and broadleaf weeds. It
is used mostly on corn, some on cotton, and less than 1%
on grain sorghum and wheat fallow. The compound is formulated as a wettable powder, a flowable suspension, or as
granules. In California, major usages are on cotton, corn
and corn for forage, almonds, and uncultivated agricultural
areas. In 1995, cyanazine was the fourth most widely used
synthetic pesticide in the U.S. Cyanazine, atrazine, and simazine are collectively referred to as the triazines and may
be alternatively used for each other on corn and in some
other situations.
Trade name
BLADEX?[C]; BLADEX? 80WP[C];
BULLET?; CYCLE?; CY-PRO?[C]; CYNEX?
41[C]; DW 3418?; EXTRAZINE?[C]; FORTROL?;
MATCH?; PAYZE?; SD 15418?; WL 19805?
Potential Exposure
A potential danger to those involved
in the manufacture, formulation, and application of this her-
bicide used for preemergence or postemergence weed con-
trol in field corn.
Carcinogenicity
No increase in tumor incidence
was noted in rats fed up to 50 ppm of cyanazine for 2 years.
The same was true for mice given up to 1000 ppm in their
diets for 2 years.
Environmental Fate
Soil. In sandy loam soils (foc = 0.01), the half-life is 12–15 days. However, in silt loam
(foc = 0.028) and clay loam (foc = 0.03) soils, the reported half-life is 20–25 days (Humburg
et al., 1989). The half-life of cyanazine is longer in alkaline soils (pH >7.5) than in acidic
soils (pH <5.5) (Humburg et al., 1989)Groundwater. According to the U.S. EPA (1986) cyanazine has a high potential to
leach to groundwater. Cyanazine amide was identified as a metabolite in groundwater in
corn fields (Muir and Baker, 1976)Plant. In plants, cyanazine is degraded by elimination of the ethyl group, hydration
of the cyano group and the removal and replacement of the chlorine atom by a hydroxyl
group (Humburg et al., 1989).Chemical/Physical. In laboratory tests, the nitrile group was hydrolyzed to the corresponding carboxylic acid. The rate of hydrolysis is faster under higher temperatures and
low pHs (Grayson, 1980). The chlorine atom may be replaced by a hydroxyl group forming
2((4-hydroxy-6-(ethylamino)-1,3,5-triazin-2-yl)amino)-2-methylpropanenitrile (Hartley
and Kidd, 1987)
Shipping
UN2763 Triazine pesticides, solid, toxic, Hazard
Class: 6.1; Labels: 6.1-Poisonous materials. UN3439
Nitriles, solid, toxic, n.o.s., Hazard Class: 6.1; Labels: 6.1-
Poisonous materials, Technical Name Required.
Incompatibilities
Cyanazine decomposes in heat producing
very toxic fumes and gases of hydrogen cyanide, hydrogen
chloride; ethyl chloride; ammonia; acetone; and ethylene.
Nitriles may polymerize in the presence of metals and some
metal compounds. They are incompatible with acids; mixing
nitriles with strong oxidizing acids can lead to extremely
violent reactions. Nitriles are generally incompatible with
other oxidizing agents such as peroxides and epoxides. The
combination of bases and nitriles can produce hydrogen cya-
nide. Nitriles are hydrolyzed in both aqueous acid and base
to give carboxylic acids (or salts of carboxylic acids). These
reactions generate heat. Peroxides convert nitriles to amides.
Nitriles can react vigorously with reducing agents.
Acetonitrile and propionitrile are Soluble in water, but
nitriles higher than propionitrile have low aqueous solubility.
They are also insoluble in aqueous acids
.Attacksmetals
in the presence of heat and moisture.
Waste Disposal
Dissolve or mix the material
with a combustible solvent and burn in a chemical incinera-
tor equipped with an afterburner and scrubber. All federal,
state, and local environmental regulations must be
observed. In accordance with 40CFR165, follow recom-
mendations for the disposal of pesticides and pesticide containers. Must be disposed properly by following pack-
age label directions or by contacting your local or federal
environmental control agency, or by contacting your
regional EPA office.
Check Digit Verification of cas no
The CAS Registry Mumber 21725-46-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,7,2 and 5 respectively; the second part has 2 digits, 4 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 21725-46:
(7*2)+(6*1)+(5*7)+(4*2)+(3*5)+(2*4)+(1*6)=92
92 % 10 = 2
So 21725-46-2 is a valid CAS Registry Number.
InChI:InChI=1/C9H13ClN6/c1-4-12-7-13-6(10)14-8(15-7)16-9(2,3)5-11/h4H2,1-3H3,(H2,12,13,14,15,16)
21725-46-2Relevant articles and documents
Herbicidal compositions comprising diamino-1,3,5-triazine and chloroacetanilide herbicides and a surfactant system
-
, (2008/06/13)
Flowable herbicidal compositions which contain an active component combination of at least one triazine and at least one chloroacetanilide with a surfactant component. This surfactant component, which consists of an anionic compound based on a monosulfuric acid ester of alkyl or alkyphenol polyglycol ethers as well as at least one nonionic alkyl or alkylphenol polyglycol ether, gives stable dispersions of the concentrated composition and forms stable dispersions of dilutions of the compositions suitable for direct use.
Substituted pyridinesulfonamide compounds or their salts, process for preparing the same, and herbicides containing the same
-
, (2008/06/13)
A substituted pyridinesulfonamide compound or its salt represented by the following general formula (I): wherein R1 is an unsubstituted or substituted alkyl group; R2 is an unsubstituted or substituted alkyl group, or an unsubstituted or substituted alkoxy group; and X and Y are each independently a member selected from the group consisting of alkyl groups and alkoxy groups, is disclosed. This compound is useful as the effective ingredient of a herbicide showing a wide weed-control spectrum even if used in a small amount.
Esters of 1-hydroxy-1H-imidazo-(4,5-b)-pyridines as herbicides
-
, (2008/06/13)
Ethers and esters of 1-hydroxy-2-(1,1-difluoroalkyl)-1H-imidazo(4,5-b)pyridine compounds, useful as herbicides.
