Definition: Inorganic or organic compounds derived from phosphine (PH3) by the replacement of H atoms. (From Grant & Hackh's Chemical Dictionary, 5th ed)
tris(2-carboxyethyl)phosphine [ TCEP ] water-soluble reagent which irreversibly reduces disulfides to thiols at room temperature & is active below neutral pH; used for quantitation of iodine and iodate