Journal
PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS
Volume 195, Issue 4, Pages 263-279Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/10426507.2019.1686379
Keywords
Water-soluble phosphorus compounds; phosphine; formaldehyde; bis(chloromethyl)ether; oxidation; toxicity
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Tetrakis(hydroxymethyl)phosphonium chloride (THPC) and sulfate (THPS) are of importance in the textile industry as flame retardants, in the oil industry as scale-removers, as biocides for water systems, in the leather industry as tanning agents, in nanochemistry as reductants and stabilizers of nanoparticles, and as oxygen-scavengers in medical uses. In the majority of cases, THPC and THPS themselves are not chemically active and solely play a role of reservoirs for the more reactive species tris(hydroxymethyl)phosphine (THP) and/or formaldehyde. The contents of THPC/THPS solutions greatly depend on pH, which is now recognized as a key factor, for example, in metal hydrosol preparations, biocidal activity, and ecotoxicity. This review is intended to reveal and explain the complex behavior of THP and (HOCH2)(4)P+ salts in aqueous solutions, conditions that might lead to potential hazardous compounds such as formaldehyde, hydrogen gas, phosphine PH3, and bis(chloromethyl)ether. Literature data on their toxicities are reviewed.
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