Skip to Content
MilliporeSigma
All Photos(1)

Key Documents

View All Documentation

04114

Sigma-Aldrich

Phosphorous acid

≥98.5%

Synonym(s):

Phosphonic acid

Sign Into View Organizational & Contract Pricing
All Photos(1)

About This Item

Empirical Formula (Hill Notation):
H3O3P
CAS Number:
13598-36-2
Molecular Weight:
82.00
EC Number:
237-066-7
MDL number:
MFCD00137258
UNSPSC Code:
12352106
PubChem Substance ID:
329747882

assay

≥98.5%

impurities

≤0.002% heavy metals (as Pb)
≤1% phosphoric acid (H3PO4)

density

1.651 g/mL at 25 °C (lit.)

anion traces

chloride (Cl-): ≤50 mg/kg
sulfate (SO42-): ≤10 mg/kg

cation traces

Fe: ≤5 mg/kg

SMILES string

[H]P(O)(O)=O

InChI

1S/H3O3P/c1-4(2)3/h4H,(H2,1,2,3)

InChI key

ABLZXFCXXLZCGV-UHFFFAOYSA-N

Looking for similar products? Visit Product Comparison Guide

Application

Phosphorous acid (H3PO3) may be used for the synthesis of α-aminomethylphosphonic acids, via Mannich type reaction.[1]

pictograms

CorrosionExclamation mark
GHS05,GHS07

signalword

Danger

Hazard Classifications

Acute Tox. 4 Oral - Eye Dam. 1 - Met. Corr. 1 - Skin Corr. 1A

Storage Class

8A - Combustible corrosive hazardous materials

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Faceshields, Gloves, type P3 (EN 143) respirator cartridges

Choose from one of the most recent versions:

Certificates of Analysis (COA)

Lot/Batch Number
6255A
51170
40440
21340
10920

Don't see the Right Version?

If you require a particular version, you can look up a specific certificate by the Lot or Batch number.

Search for a COA

Already Own This Product?

Find documentation for the products that you have recently purchased in the Document Library.

Visit the Document Library

Anodic oxidation mechanism of hypophosphorous and phosphorous acid on palladium.
Trasatti S and Alberti A.
Journal of Electroanalytical Chemistry, 12(3), 236-249 (1966)
Rickard DA.
Journal of Plant Nutrition, 22(36), 3537-3540 (1981)
Alain Graillot et al.
Journal of hazardous materials, 244-245, 507-515 (2012-11-28)
In order to remove metal ions from wastewaters, thermosensitive copolymers bearing sorption properties toward metal cations were prepared by free radical copolymerization between the N-n-propylacrylamide (NnPAAm) and the (dimethoxyphosphoryl)methyl 2-methylacrylate (MAPC1), followed by a hydrolysis of the phosphonated esters into
Faizah Md Yasin et al.
Chemical communications (Cambridge, England), 48(81), 10102-10104 (2012-09-08)
Size selective growth of palladium nano-particles 2-7 nm in diameter on the surface of carbon nano-onions (CNOs) (derived from catalytic cracking of methane) in water involves pretreating the CNOs with p-phosphonic acid calix[8]arene then H(2)PdCl(4) followed by dynamic thin film
L Qi et al.
Langmuir : the ACS journal of surfaces and colloids, 28(31), 11448-11456 (2012-07-17)
In a recent publication, we have highlighted the potential of phosphonic acid terminated PEG oligomers to functionalize strong UV absorption cerium oxide nanoparticles, which yield suspensions that are stable in aqueous or organic solvents and are redispersible in different solvents
View All Related Papers

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service