MATERIAL SAFETY DATA SHEET
WEED-HOE Page 1 of 4 Issue Date: 01/06
SECTION 1. PRODUCT AND COMPANY IDENTIFICATION
Chemical Product
WEED-HOE
EPA Reg. No. 61483-15-17545
Common Name: Liquid herbicide.
Chemical Description: Monosodium Acid Methanearsonate (MSMA) solution.
TSCA/CAS No.: The primary CAS number is 2163-80-6
Manufactured For
Monterey AgResources
P. O. Box 35000
Fresno, CA 93745-5000
Emergency Phone Numbers
Emergency Telephone: DAYS: (559) 499-2100 EVES: (559) 994-9144
CHEMTREC (24-Hour Emergency Number): (800) 424-9300
EPA National Response Center: (800) 424-8802
SECTION 2. HAZARDOUS INGREDIENTS
CHEMICAL CAS NO. % TLV OR PEL RQ (lbs)
Monosodium acid methanearsonate 2163-80-6 48.3 0.01 mg/m3 (TWA) *N.P.
(Total arsenic, as elemental, 22.3% all in water soluble form.) ACGIH TLV (elemental and inorganic
As)
0.5 mg/m3 (TWA)
OSHA PEL (elemental and inorganic As)
* N.P. - Not pertinent.
SECTION 3. EMERGENCY/HAZARDS OVERVIEW
Light yellow liquid with no odor. Harmful if swallowed or absorbed through the skin. Noxious fumes
may be emitted under fire conditions. Not D.O.T. regulated.
HEALTH: 1 REACTIVITY: 0 FLAMMABILITY: 0 ENVIRONMENT: 1
(0=Insignificant 1=Slight 2=Moderate 3=High 4=Extreme)
SECTION 4. FIRST AID
Eyes: Check for and remove contact lenses. Immediately flush eyes with plenty of water for at
least 15 minutes. Hold the eyelids apart to ensure flushing of the entire eye surface. Seek
medical attention.
Skin: Wash with plenty of soap and water. Get medical attention if irritation persists.
Ingestion: Provided the patient is conscious, give 1 or 2 glasses of water to drink. Induce vomiting by
touching back of throat with finger. Keep airway clear. Never give anything by mouth to an
unconscious person. Obtain medical attention.
Note to Physician: If ingested, gastric lavage may be indicated. Chelation Therapy with BAL
or D-penicillamine has been recommended in the literature for symptomatic arsenic
poisoning. Persons allergic to penicillin may suffer reaction to D-penicillamine and,
therefore, should be treated with BAL only.
Inhalation: Remove victim to fresh air. Until adequate ventilation or other control measures are
restored, employ proper respiratory protection. If symptoms develop, seek medical
attention.
WEED-HOE Page 2 of 4 Issue Date: 01/06
SECTION 5. FIRE AND EXPLOSION HAZARDS
Flash Point: Nonflammable.
Test Method: Not pertinent.
LEL Flammable Limits: Not pertinent.
UEL Flammable Limits: Not pertinent.
Autoignition Temperature: Not pertinent.
Flammability Classification: Noncombustible.
Known Hazardous Products of Combustion: None known.
Properties that Initiate/Contribute to Intensity of Fire: None known.
Potential For Dust Explosion: None.
Reactions that Release Flammable Gases or Vapors: None known.
Potential For Release of Flammable Vapors: None.
Unusual Fire & Explosion Hazards: Noxious fumes may be emitted under fire
conditions.
Extinguishing Media: Dry chemical or carbon dioxide. Avoid use of
water or foam to prevent spread of
contamination.
Special Firefighting Procedures: Stay upwind of smoke. Wear positive pressure,
self-contained breathing apparatus and goggles.
Contain any liquid runoff.
SECTION 6. SPILLS AND LEAKS
Containment: Prevent product spillage from entering drinking water supplies or streams.
Clean Up: Collect liquid or absorb onto absorbent material and package for disposal according to
local, state, and federal regulations.
Evacuation: Not necessary but restrict entry.
SECTION 7. STORAGE AND HANDLING
Storage: Store in plastic or stainless steel container in a cool, well-ventilated, dry place
at temperatures above 40潞F. Do not store in contact with aluminum, copper,
tin, zinc or galvanized metals. Do not contaminate water, food, feeds, seeds,
fertilizers, insecticides or fungicides. Do not stack pallets more than two (2)
high.
Transfer Equipment: Transfer product using chemical-resistant plastic or stainless steel tanks,
pumps, valves, etc.
Work/Hygienic Practices: Harmful if swallowed or absorbed through the skin. Avoid contact with eyes,
skin, or clothing. Avoid breathing vapors or spray mist. Wash thoroughly
with soap and water after handling. Remove contaminated clothing and wash
before reuse. Keep children and domestic animals off treated areas until
spray has dried or material has been washed into the soil.
SECTION 8. PERSONAL PROTECTIVE EQUIPMENT
Eyes: Wear protective eyewear.
Skin: Wear long-sleeved shirt and long pants, waterproof gloves, shoes plus socks, and
chemical-resistant apron when cleaning equipment, mixing or loading.
Respiratory: See label for required EPA required respirators.
Ventilation: Provide exhaust ventilation or other engineering controls to keep the airborne
concentrations of vapors below their respective threshold limit value.
Other: Eyewash station and safety shower in the work area.
WEED-HOE Page 3 of 4 Issue Date: 01/06
SECTION 9. PHYSICAL AND CHEMICAL DATA
Appearance: Light yellow liquid.
Odor: None.
pH: 5.7 to 6.7
Vapor Pressure: <7.5 x 10-8 Torr @ 25潞C (For MAA)
Vapor Density (Air=1): Not determined.
Boiling Point: 108潞C +/- 2潞C
Freezing Point: -32潞C. Do not allow product to freeze.
Water Solubility: Completely soluble.
Density: 12.6 lbs./gal. @ 20潞C
Evaporation Rate (butyl acetate = 1): Not determined.
Viscosity: Not available.
% Volatile: 60% (v/v).
Octanol/Water Partition Coefficient: Not available.
Saturated Vapor Concentration: Not available.
SECTION 10. STABILITY AND REACTIVITY
Stability: Stable under normal conditions.
Incompatibility / Conditions To Avoid: Contact with acids, nascent hydrogen and metals such as zinc,
aluminum, copper and tin.
Hazardous Decomposition Products: Arsenic, in the presence of acids and metals such as zinc,
aluminum, copper and tin can combine with nascent hydrogen
to form arsine gas, which is a highly poisonous, colorless,
non-irritating gas with a mild garlic odor.
Hazardous Polymerization: Will not occur.
SECTION 11. POTENTIAL HEALTH EFFECTS
Acute Effects:
Eyes: Although MSMA is non-irritating to the cornea, mild conjunctival irritation may
persist for several days in unwashed eyes. Washing eyes immediately following
exposure should prevent eye irritation.
Skin: Mild irritant, especially from repeated and/or prolonged exposure. May cause
redness. Not readily absorbed through intact skin. LD50: 4200 mg/kg (rabbit).
Ingestion: Slightly toxic. Probable lethal dose in man is between 1 ounce and 1 pint of
liquid. Acute oral LD50 Rat = 1580 mg/kg.
Inhalation: Prolonged exposure might induce mild irritation of the respiratory tract, but
recovery following exposure should be rapid. LC50 (4 Hour) Rat = >20 mg/L.
Overexposure Effects: Acute overexposure may result in mild irritation to tissue. Symptoms of arsenic
poisoning are headache, dizziness, stupor, vomiting, diarrhea, convulsions,
paralysis or death. Degree of irritation may increase with chronic exposure.
Poisoning effects can be salty taste in mouth, burning throat, and stomach and
intestinal pain
SECTION 12. ECOLOGICAL INFORMATION
Algal/Lemna Growth Inhibition: Acute toxicity; slight.
Toxicity to Fish and Invertebrates: Acute toxicity; slight.
Toxicity to Plants: Acutely toxic.
Toxicity in Birds: Acute toxicity; slight.
WEED-HOE Page 4 of 4 Issue Date: 01/06
SECTION 13. DISPOSAL
PESTICIDE DISPOSAL: Wastes resulting from the use of this product may be disposed of on site or at an
approved waste disposal facility. Do not contaminate waterways by cleaning of equipment or by
disposal of wastes.
CONTAINER DISPOSAL: Empty container retains product residue. Triple rinse (or equivalent) empty
container, return rinse water to dilution mixture, and dispose of dilution mixture as hazardous waste if
it cannot be disposed of by use according to label instructions. Do not reuse empty container. Offer it
for recycling or reconditioning, or puncture and dispose of in properly permitted landfill.
Also, chemical additions or other alterations of this product may invalidate any disposal information in
this MSDS. Therefore, consult local waste regulators for proper disposal.
SECTION 14. TRANSPORTATION
D.O.T. SHIPPING DESCRIPTION: Not D.O.T. regulated.
OTHER SHIPPING INFORMATION: Compounds, Tree or Weed Killing (Herbicide), Liquid.
NMFC Item 50320, LTL Class 60
SECTION 15. REGULATORY INFORMATION
CERCLA: None.
SARA TITLE III, Section 313 Toxic Chemicals: Arsenic compounds (22.3%).
PROPOSITION 65: None.
SECTION 16. OTHER
While the information contained herein is based on data considered accurate and was compiled to
comply with the Federal Hazard Communication Standard and the California Hazardous Substances
Information and Training Act, it is provided for guidance only. Monterey AgResources does not
guarantee its accuracy or completeness. Health and safety precautions in this data sheet may not be
adequate for all individuals and/or situations. It is the user鈥檚 obligation to evaluate and use this
product safely and to comply with all applicable laws and regulations; in so doing, user assumes all risk
in use of the material. The information contained herein is not to be taken as a warranty or
representation for which Monterey AgResources assumes legal responsibility.
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