Development of Method Determining Tetramethylammonium Hydroxide and Tetramethylammonium Salts in Industrial Wastewater by LC-MS/MS

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  • LC-MS/MSによる事業場排水中の水酸化テトラメチルアンモニウムとテトラメチルアンモニウム塩類の測定法開発

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<p>In this study, we developed a method of determining tetramethylammonium hydroxide and tetramethylammonium salts, present in industrial wastewater as tetramethylammonium ions (TMA) , by liquid chromatography-tandem mass spectrometry (LC-MS/MS) . Tetramethylammonium hydroxide was used as a standard solution. The lower limit of quantification for TMA analysis by solid-phase extraction (SPE) using a weak cation exchange resin (Oasis WCX) was 0.00034 mg L-1, and the recovery of surrogate standards ranged from 50 to 120%. We investigated 30 industrial wastewater samples from Fukuoka Prefecture by the developed TMA analysis method. TMA was detected in two samples, H and X, with concentrations of 0.0014 and 2.5 mg L-1, respectively. In sample X, the immobilization of Daphnia magna was observed even at 50% dilution, and the 48 h-EC50 was 62%. The toxicity removal test indicated reduced toxicity for sample X after SPE-WCX.</p>

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