Water & Air / Compounds / Cobalt(II) oxide (CoO)

Cobalt(II) oxide (CoO) in water and air: safety profile

Moderate risk

Not medical or professional safety advice, and not a substitute for a qualified clinician — consult one. Full disclaimer →

Low_to_moderate risk based on available hazard data.

What is cobalt(ii) oxide (coo)?

Also known as: Cobalt [II] oxide, Cobalt(II) oxide, Cobaltous oxide, Cobalt monoxide.

CAS number
1307-96-6
Molecular formula
CoO
Molecular weight
74.933 g/mol
SMILES
[Co+2].[O-2]

Risk for people

Moderate risk

Low_to_moderate risk based on available hazard data.

Regulatory consensus

No regulatory classifications on file for Cobalt(II) oxide (CoO) at this time.

No regulatory classifications on file for this compound.

Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.

Where you encounter cobalt(ii) oxide (coo)

  • Contaminated Water — Mining site runoff, Industrial discharge, Old infrastructure
  • Food Chain — Fish from contaminated waters, Crops in contaminated soil

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Cobalt(II) oxide (CoO):

  • Mineral-based or plant-derived pigments
    Trade-offs: Narrower color range. May fade faster than synthetic pigments.
    Relative cost: 2-5× conventional

Frequently asked questions

Is cobalt(ii) oxide (coo) safe for you?

Low_to_moderate risk based on available hazard data.

What products contain cobalt(ii) oxide (coo)?

Cobalt(II) oxide (CoO) appears in: Mining site runoff (Contaminated water); Industrial discharge (Contaminated water); Fish from contaminated waters (Food chain); Crops in contaminated soil (Food chain).

See Cobalt(II) oxide (CoO) in the water app

Look up products containing cobalt(ii) oxide (coo), compare to alternatives, and explore the full data record.

Open in water View raw API data

Sources (2)
  1. ATSDR Toxicological Profile — CAS 1308-06-1 — reference
  2. OEHHA Proposition 65 list — Cobalt [II] oxide (CAS 1307-96-6), cancer, 1992 — regulatory

Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for medical, legal, or regulatory advice. Why we built ALETHEIA →