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Ammonium iron(3+) sulfate (1:1:2)

CAS 10138-04-2

Sulfuric acid, ammonium iron(3+) salt (2:1:1)

Molecular structure of 10138-04-2
1 Fe³⁺ · 1 NH₄⁺
US productionNot reported
Import value, 2024$7M
Top sourceMexico 84%

This chemical is listed as active in US commerce, but no company reported it to EPA’s survey for 2019 or 2023. Sites may have made or imported less than the threshold amount, or none.

Why supply is unknown

Production is reported production, not a complete census of factories. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 283330 · basket

These shares come from HS customs code 283330, which covers 7 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
MX 84%MexicoIT 7%ItalyIN 4%IndiaDE 4%GermanyES 1%Spain

Why It Matters

No EPA sector or FDA product records name a use for this chemical.

Chemical Identity

CAS10138-04-2
PubChem CIDNot recorded
DTXSIDDTXSID8051417
FormulaFeH5NO8S2
Mol. Weight267 g/mol
SMILES[NH4+].[Fe+3].OS([O-])(=O)=O.[O-]S([O-])(=O)=O

Data Sources

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Brief citations

Ammonium iron(3+) sulfate (1:1:2) (CAS 10138-04-2) https://chemicalindependence.com/chemical/10138-04-2/ EPA TSCA Inventory: CAS 10138-04-2. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 283330 for CAS 10138-04-2. Reporting year: 2024. https://usatrade.census.gov/