☣️ UN 1683 • CLASS 6
Silver arsenite
Placard: Toxic. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
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⚠️ This page is a quick-reference aid. For real incidents: stage upwind, isolate, deny entry, request Hazmat early, and consult the current ERG + SOP/SOG.
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Quick details
UN 1683
Class: 6
Placard type: Toxic
ERG: Guide 151 (check current ERG)
Isolation: ERG 151: Isolate spill area minimum 25m all directions; if large spill, isolate 50m and evacuate downwind; highly toxic by all routes
Chemical & Response Details
| Also known as | Arsenous acid silver saltSilver metaarseniteArgentous arseniteSilver(I) arsenite |
| CAS Number | 7784-08-9 |
| Appearance | Yellow to yellowish-gray crystalline powder or solid. Odorless. Stable at room temperature but decomposes when heated. |
| Flash Point | Not applicable (inorganic solid, non-combustible) |
| Boiling Point | Not applicable (decomposes before boiling) |
| Vapor Density | Not applicable (solid) |
| Water Reactivity | Slight solubility in water; no violent reaction but may release toxic arsenic compounds in acidic conditions |
| Extinguishing | Water spray, dry chemical, CO2 suitable for surrounding fires; avoid dispersing material |
| PPE | ⚠️ Level A or B minimum; full-face SCBA required; chemical-resistant suit, gloves, and boots mandatory to prevent any skin contact |
| Isolation | ERG 151: Isolate spill area minimum 25m all directions; if large spill, isolate 50m and evacuate downwind; highly toxic by all routes |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Common hazards (high level)
- 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.
First actions (field-minded)
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
- 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
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UN 1683 — Silver arsenite HAZMAT RADIO NOTE — UN 1683
Product: Silver arsenite
Class 6 / Toxic / ERG 151
PPE: Level A or B minimum; full-face SCBA required; chemical-resistant suit, gloves, and boots mandatory to prevent any skin contact
ISOLATION: ERG 151: Isolate spill area minimum 25m all directions; if large spill, isolate 50m and evacuate downwind; highly toxic by all routes
ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO
Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
=== IC HAZMAT BRIEFING ===
UN 1683 — Silver arsenite
Class: 6 | Placard: Toxic | ERG Guide: 151
Appearance: Yellow to yellowish-gray crystalline powder or solid. Odorless. Stable at room temperature but decomposes when heated.
Water Reactivity: Slight solubility in water; no violent reaction but may release toxic arsenic compounds in acidic conditions
Extinguishing: Water spray, dry chemical, CO2 suitable for surrounding fires; avoid dispersing material
PPE: Level A or B minimum; full-face SCBA required; chemical-resistant suit, gloves, and boots mandatory to prevent any skin contact
Isolation: ERG 151: Isolate spill area minimum 25m all directions; if large spill, isolate 50m and evacuate downwind; highly toxic by all routes
— Key Hazards —
• 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.
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper
• 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
SOURCE: allfirefighter.com/hazmat/un/1683 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief. Full chemical + response details.
UN1683 Silver arsenite Cls6 ERG151 | ERG 151: Isolate spill area minimum 25m all directions; if large spill, isolate | allfirefighter.com/hazmat/un/1683SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS. Includes link to full page.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions. Page: https://allfirefighter.com/hazmat/un/1683
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FAQ
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.
CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper Keep unauthorized personnel away. Stay upwind, uphill and/or upstream.
Level A or B minimum; full-face SCBA required; chemical-resistant suit, gloves, and boots mandatory to prevent any skin contact
No. This is a training/quick-reference aid only. Always consult the current ERG Guide 151 and your department SOP/SOG for incident-specific protective actions.
Sources (high level): DOT/PHMSA marking & class concepts + ERG usage principles. This page does not reproduce ERG guide text—always consult the current ERG for incident-specific protective actions.