Rapid Determination of Hexamethylenetetramine in River Water by Liquid Chromatograph-Tandem Mass Spectrometer

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We developed a simple and fast determination method of hexamethylenetetramine (HMT) by using liquid chromatography/tandem mass spectrometry to evaluate its concentration in river water. Well-defined peaks of HMT were obtained by using a hydrophilic interaction column. A calibration curve showed good linearity (R2 = 0.999). The instrumental detection limit and the instrumental quantification limit were 0.06 μg L−1 and 0.16 μg L−1, respectively. Only filtration was adopted for river-water sample pretreatment; the detection limit of HMT was calculated to be 0.12 μg L−1. The recoveries of HMT added to pure water and river water ranged from 102% to 106% and from 92% to 104%. HMT was detected from 6 of 13 grab samples taken from Tone River system between May 18th and May 20th; the maximum concentration was 150 μg L−1.