Description
Synonyms: 2,2′,2′′-Nitrilotriethanol, Tris(2-hydroxyethyl)amine, TEA
Linear Formula: (HOCH2CH2)3N
Molecular Weight: 149.19
General description
Triethanolamine (TEA) belongs to the family of ethanolamine. It includes the properties of both amines and alcohols. Addition of TEA to an acidic buffer facilitates the determination of fluoride in inorganic orthophosphates by using a fluoride-selective electrode.
Application
Triethanolamine (TEA) has been used:
- as a component of the acetylation working solution
- in the preparation of polyethylene glycol (PEG) hydrogels
- as a constituent of CO2/O2 specificity (SC/O) assay buffer
PROPERTIES
vapor density
5.14 (vs air)
Pack Size
500 mL
vapor pressure
0.01 mmHg ( 20 °C)
Assay
≥99.0% (GC)
form
liquid
viscous liquid
autoignition temp.
600 °F
expl. lim.
8.5 %
technique(s)
GC/GC: suitable
impurities
≤0.1% ethanolamine (GC)
≤0.2% water
≤0.3% diethanolamine (GC)
refractive index
n20/D 1.485 (lit.)
pH
10.5-11.5 (25 °C, 149 g/L)
useful pH range
7.3-8.3
pKa (25 °C)
7.8
bp
190-193 °C/5 mmHg (lit.)
mp
17.9-21 °C (lit.)
solubility
H2O: 1 M, clear, colorless
density
1.124 g/mL at 25 °C (lit.)
anion traces
chloride (Cl–): ≤5 mg/kg
sulfate (SO42-): ≤20 mg/kg
cation traces
Ca: ≤5 mg/kg
Cd: ≤1 mg/kg
Co: ≤1 mg/kg
Cr: ≤1 mg/kg
Cu: ≤1 mg/kg
Fe: ≤1 mg/kg
K: ≤20 mg/kg
Mg: ≤1 mg/kg
Mn: ≤1 mg/kg
Ni: ≤1 mg/kg
Pb: ≤1 mg/kg
Zn: ≤1 mg/kg
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