Calcium arsenate
- Tricalcium arsenate
- Pencal
- Tricalcium orthoarsenate
- Cucumber dust
Calcium arsenate | |
| |
| Formula | Ca3(AsO4)2 |
| Structure | |
| Description | White powder. |
| Uses | The material is used as an insecticide, molluscicide. |
| Registry Numbers and Inventories. | |
| CAS | 7778-44-1 |
| EC (EINECS/ELINCS) | 231-904-5 |
| RTECS | CG0830000 |
| RTECS class | Agricultural Chemical and Pesticide; Tumorigen |
| UN (DOT) | 1573 |
| Merck | 12,1686 |
| Beilstein/Gmelin | 69951 (G) |
| RCRA | D004 |
| EPA OPP | 13501 |
| Swiss Giftliste 1 | G-1346 |
| Canada DSL/NDSL | DSL |
| US TSCA | Listed |
| Japan ENCS (MITI) | Listed |
| Korea ECL | Listed |
| Properties. | |
| Formula | As2Ca3O8 |
| Formula mass | 398.07 |
| Melting point, °C | 1455.0 |
| Density | 3.62 g/cm3 |
| Solubility in water | Insoluble |
| Hazards and Protection. | |
| Storage | Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage. |
| Handling | All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood. |
| Protection | Wear appropriate protective gloves, clothing and goggles. |
| Respirators | Wear positive pressure self-contained breathing apparatus (SCBA). |
| Small spills/leaks | Keep material out of water sources and sewers. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. Cover solids with a plastic sheet to prevent dissolving in rain or fire fighting water. Water spill: Neutralize with agricultural lime (CaO), crushed limestone (CaCO3), or sodium bicarbonate (NaHCO3). Add ferric chloride (FeCl3). Adjust pH to neutral (pH=7). Use mechanical dredges or lifts to remove immobilized masses of pollutants and precipitates. |
| Stability | Moisture and carbon dioxide cause slow decomp to calcium carbonate and (phytotoxic) dicalcium hydrogen arsenate. In the presence of acids, water sol, strongly phytotoxic arsenic acid is produced. |
| Incompatibilities | When water soln of arsenicals are in contact with active metals such as arsenic, iron, aluminum, zinc, highly toxic fumes of arsenic including arsine are released. Arsenic compounds produces toxic fumes of arsenic when heated to decomposition. |
| Decomposition | Dangerous when heated to decomposition, emits toxic fumes of arsenic including arsine. |
| Fire. | ||||
| Fire fighting | Stay upwind; keep out of low areas. Wear self-contained (positive pressure if available) breathing apparatus and full protective clothing.Not flammable. For small fires, use dry chemical, water spray, or foam. For large fires, use water spray, fog, or foam. | |||
| Fire potential | Not combustible. | |||
| Hazards | When heated to decomposition, calcium arsenate produces toxic fumes of arsenic. Avoid heat. | |||
| Combustion products | Poisonous gases may be produced in fire. | |||
| NFPA | Health | 3 | ||
| Health. | |
| Exposure limit(s) | OSHA PEL: 1910.1018 TWA 0.010 mg/m3 NIOSH REL: Ca C 0.002 mg/m3 15-minute See Appendix A NIOSH IDLH: Potential occupational carcinogen 5 mg/m3 (as As) |
| Carcinogin | O, G-A1, I-1, N-1, CP65 |
| Poison_Class | 2 |
| Exposure effects | Patients may rapidly become hypotensive. Rapid heart rate may develop secondary to pain, hypovolemia, cardiac effects of arsenic or anxiety. Toxic delirium and encephalopathy are possible complications. Peripheral neuropathy is common. Seizures may occur. Calcium arsenate is teratogenic and fetotoxic in experimental animals and is likely to be fetotoxic in humans. However at permissible occupational exposure limits, arsenic is NOT likely to be a significant risk to human reproduction. Acute ingestion may cause neonatal death. Arsenic can cross the placenta. <br>Arsenic is excreted in the breast milk. <br>Systemic toxicity was present before any effects were noted on the testes. Fertility does not seem to be affected by arsenic exposure. |
| Ingestion | Early symptoms within hours following arsenic ingestion include abdominal pain, vomiting, profuse bloody or watery (rice-water-like) diarrhea, pain in the extremities and muscles, weakness, and flushing of the skin. |
| Inhalation | Acute respiratory failure was seen in a patient with severe arsenic poisoning. Pulmonary edema may occur and be life-threatening. Adult respiratory distress syndrome (ards) has been reported. |
| Skin | Avoid any skin contact. See Inhalation. |
| Eyes | Inflammation of the eye, photophobia, dimness of vision, diplopia, and tearing may occur. A garlic-like odor may be detected on the breath. |
First aid |
|
| Ingestion | Gastric decontamination - aggressive decontamination with gastric lavage is recommended. Activated charcoal: administer charcoal as a slurry (240 ml water/30 g charcoal). Usual dose: 25 to 100 g in adults/adolescents. |
| Inhalation | Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult. |
| Skin | Remove and isolate contaminated clothing and shoes. Remove material from skin immediately. Immediately flush with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin. |
| Eyes | Immediately flush with running water for at least 20 minutes. |
| Transport. | ||
| UN number | 1573 | |
| Response guide | 151 | |
| Hazard class | 6.1 | |
| Packing Group | II | |
| USCG CHRIS Code | CCA | |
| Std. Transport # | 4923218 | |