CHEMICAL AND PHYSICAL PROPERTIES
| Physical Description | Methamidophos is a crystalline solid, technical product is off-white with a pungent odor. Used as an insecticide on a number of vegetables and on cotton. (EPA, 1998) |
|---|---|
| Color/Form | Colorless crystals |
| Odor | Mercaptan-like odor |
| Boiling Point | Decomposes (EPA, 1998) |
| Melting Point | 112 °F (EPA, 1998) |
| Solubility | Soluble in aliphatic chlorinated hydrocarbons, alcohols; slightly soluble in ether. |
| Density | 1.31 at 112.1 °F (EPA, 1998) - Denser than water; will sink |
| Vapor Pressure | 0.0003 mmHg at 86 °F (EPA, 1998) |
| LogP | log Kow = -0.8 @ 20 °C |
| Stability/Shelf Life | STABLE AT AMBIENT TEMP... . |
| Decomposition | When heated to decomposition it emits very toxic fumes of /nitrogen, phosphorous and sulfur oxides/. |
| Corrosivity | Slightly corrosive to mild steel and copper-containing alloys. |
| Ionization Efficiency | Positive |
| Refractive Index | Index of refraction: 1.5092 @ 40 °C/D |
| Collision Cross Section | 123.2 Ų [M+H]+ [CCS Type: DT, Method: single field calibrated] |
| Kovats Retention Index | 1211 1228 1204 1225.9 1235 |
| Other Experimental Properties | CORROSIVE TO MILD STEEL AND COPPER CONTAINING ALLOYS /TECHNICAL GRADE/ |
| Chemical Classes | Pesticides -> Organophosphate Insecticides |
COMPUTED DESCRIPTORS
| Molecular Weight | 141.13 g/mol |
|---|---|
| XLogP3 | -0.9 |
| Hydrogen Bond Donor Count | 1 |
| Hydrogen Bond Acceptor Count | 4 |
| Rotatable Bond Count | 2 |
| Exact Mass | 141.00133667 g/mol |
| Monoisotopic Mass | 141.00133667 g/mol |
| Topological Polar Surface Area | 77.6 Ų |
| Heavy Atom Count | 7 |
| Formal Charge | 0 |
| Complexity | 95.7 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 0 |
| Undefined Atom Stereocenter Count | 1 |
| Defined Bond Stereocenter Count | 0 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 1 |
| Compound Is Canonicalized | Yes |
PRODUCT INTRODUCTION
description
Methamidophos is a crystalline solid, technical product is off-white with a pungent odor. Used as an insecticide on a number of vegetables and on cotton. (EPA, 1998)