UN 1607 — Ferric arsenite
Placard: Toxic. ERG Guide 151. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
Ferric arsenite is a highly toxic substance that can be fatal if inhaled, ingested, or absorbed through skin. It is a brown to reddish-brown powder or solid with no characteristic odor.
Hazard overview: Ferric arsenite is highly toxic and may be fatal if inhaled, ingested, or absorbed through skin. Avoid any skin contact.
Response guidance: Isolate the spill area and protect personnel from exposure. Use dry chemical, sand, or dry earth for spill response.
UN 1607 Quick Details
Common Hazards of UN 1607
- Highly toxic, may be fatal if inhaled, ingested or absorbed through skin.
- Avoid any skin contact.
- Fire may produce irritating, corrosive and/or toxic gases.
- Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental
- Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive
- Containers may explode when heated.
- Runoff may pollute waterways.
Chemical Identity & Physical Properties
Ferric arsenite is a brown to reddish-brown powder or solid with no characteristic odor. It exists as a solid at room temperature.
| Also known as | Iron arseniteFerric arsenite mixtureIron(III) arseniteArsenous acid iron(III) salt |
| CAS Number | 63989-69-5 |
| Appearance | Brown to reddish-brown powder or solid with no characteristic odor. Exists as a solid at room temperature. |
| Flash Point | Not applicable (non-flammable inorganic solid) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid, non-volatile) |
| Water Reactivity | Slightly soluble in water; may release toxic arsenic compounds upon prolonged contact with moisture |
Fireground Response Guidance — UN 1607
Extinguishing Media
PPE Requirements
Level A or B required; full-face SCBA, chemical-resistant suit, gloves, and boots mandatory due to extreme toxicity.
Isolation & Evacuation
First Actions for a UN 1607 Incident
- Keep unauthorized personnel away.
- Stay upwind, uphill and/or upstream.
- Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters
- For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.
- For non-highlighted materials: increase the immediate precautionary measure distance, in the downwind
📋 Copy & Share Field Card
UN 1607 — Ferric arseniteUse for: Quick radio or face-to-face size-up. Short, structured, field-ready.
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
Use for: Quick text to command or incoming units. Fits in a single SMS.