Nitrilotriacetic acid

CAS Number
139-13-9
EC Number
205-355-7
Abbreviation
NTA

What is Nitrilotriacetic acid?

Nitrilotriacetic acid (CAS 139-13-9), commonly abbreviated as NTA, is a chelating agent that binds and sequesters metal ions in aqueous systems. Also known as triglycollamic acid and aminotriacetic acid.

Where is Nitrilotriacetic acid used?

  • Water treatment: prevents scale formation and controls heavy metal precipitation in industrial cooling and process water systems
  • Textile and paper: deactivates trace metals that interfere with bleaching, dyeing, and pulp processing
  • Leather processing: supports metal removal during preparatory stages
  • Personal care: sequestrant that stabilizes formulations against metal-induced degradation
  • It functions as a cost-effective alternative to EDTA across industrial processes where metal ion control is critical.

Good to know: Not to be confused with EDTA; NTA is a cost-effective alternative. Purity levels are typically confirmed by titration or HPLC methods to meet industrial application requirements.

Commercial specifications

  • Purity levels are typically confirmed by titration or HPLC methods to meet industrial application requirements.

Other Names (Synonyms)

Triglycollamic acid|N,N-Bis(carboxymethyl)glycine|Aminotriacetic acid|2-[bis(carboxymethyl)amino]acetic acid|Trilon A|Versene NTA acid|Hampshire NTA acid|Komplexon I|NTA

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What are the physical properties of Nitrilotriacetic acid?

Melting Point 242 °C (decomp)
Boiling Point 326.86°C (rough estimate)
Density >1 g/cm³ @ Temp: 20 °C
Flash Point 100 °C
Appearance Nitrilotriacetic acid is a crystalline compound.
Color White
Form Powder
Water Solubility Insoluble. <0.01 g/100 mL at 23 ºC
Vapor Pressure 0-0Pa at 20-25℃
Refractive Index 1.4860 (estimate)
pH 1.7-2.7 (23°C, 10g/L)
Log P -3.81 at 25℃

How is Nitrilotriacetic acid classified and handled safely? Learn More

Warning
GHS07· Irritant GHS08· Health Hazard GHS09· Environmental Hazard

Hazard Statements

H302 Harmful if swallowed
H315 Causes skin irritation
H319 Causes serious eye irritation
H320 Causes eye irritation

Precautionary Statements

P203 Obtain, consult and follow expert instructions for use.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.
P270 Do not eat, drink or smoke when using this product.

Which trade and regulatory codes apply to Nitrilotriacetic acid?

HS Code 29224995
Storage Class 11 - Combustible Solids
WGK (Germany) 2
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