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         Trialkyl phosphine oxide ( TRPO )extractant is liquid phosphine oxide,its potential use is extraction of organic and inorganic solutes from water.
         Compared with TOPO,its advantageous are: even in low temperature,can be completely miscible with common hydrocarbon diluent.
Chemical structure formula
Trialkyl phosphine oxide ( TRPO )Extractant is the mixer of the following four trialkyl phosphine oxide:
R₃P(O)     R₂R'P(O)     RR '₂P(O)     R₃'P(O)
Here R=[CH₃(CH₂)₇n-octyl ]
R ' =[CH₃(CH₂)₅n-octyl ]
average molecular weight is about 348.
Typical property

Trialkyl phosphine oxide :	93%
Appearance:	Colorless liquid
Proportion( 25 °C):	0.88
Freezing point:	-5~0 °C
Viscosity ( 25 °C):	40.0 Cps
( 50 °C):	13.7 Cps
Flash point:	182 °C
Autogenous ignition temperature:	218 °C
Vapour pressure * ( 31 °C):	0.09mmHg
Boiling point( 50 mmHg ):	310 °C
Solubility:	10mg/L
Solubility of water in TRPO extractant:	8w/o