Determination of Phosphoric Acid Mono- and Diesters in Municipal Wastewater by Solid-Phase Extraction and Ion-Pair Liquid Chromatography−Tandem Mass Spectrometry
The first analytical method for the determination of 13 phosphoric acid mono- and diesters from aqueous samples is presented. The method consists of solid-phase extraction (SPE) and ion-pair liquid chromatographic separation with tri-n-butylamine coupled to electrospray ionization tandem mass spectrometry in the negative ion mode. Due to a lack of pure standards, only 3 of the 13 esters could be quantified. SPE recoveries ranged from 71 to 112% for di-n-butyl phosphate, diphenyl phosphate, and di-(2-ethylhexyl) phosphate (DEHP) with limits of quantification from 7 to 14 ng/L for 100-mL samples. At analyte concentrations ≥1 μg/L, aqueous samples can be analyzed by direct injection without extraction. In municipal wastewater, six diesters and one monoester were unambiguously identified by comparison with synthesized reference material. DEHP showed highest concentrations of 60 and 5 μg/L in raw and treated wastewater, respectively. The detection of monoethylhexyl phosphate was confirmed by LC−Q-TOF-MS analysis, and it was found at a concentration level comparable to DEHP. Laboratory degradation tests show that phosphoric acid diesters can be formed as intermediates in the microbial degradation of trialkyl phosphates that are being used as flame retardants and plasticizers.
Phosphate esters of two butanol isomers were synthesized by esterification of n‐butanol and isobutanol with phosphorus pentoxide. The surface activity and penetrability of the esters were analyzed by way of surface chemistry and canvas disc wetting tests in different alkaline solutions. The surface tension of the butanol phosphate esters and their sodium salts was found to decrease with increasing
通过将正丁醇和异丁醇与五氧化二磷酯化来合成两种丁醇异构体的磷酸酯。通过在不同碱性溶液中的表面化学和帆布圆盘润湿测试,分析了酯的表面活性和渗透性。发现丁醇磷酸酯及其钠盐的表面张力随碱浓度增加至250 g / L NaOH而降低。此外,该产品即使在高碱性溶液中也表现出良好的表面活性和适当的渗透性。酯在浓碱液中的稳定表面活性可以归因于由于常见的离子效应而从溶液中吸附分子。
Nitta, Yoshihiro; Arakawa, Yasushi, Chemical and pharmaceutical bulletin, 1986, vol. 34, # 8, p. 3121 - 3129
作者:Nitta, Yoshihiro、Arakawa, Yasushi
DOI:——
日期:——
The Thermal Decomposition of Dialkyl Phosphates and O,O-Dialkyl Dithiophosphates<sup>1</sup>