Establishment and Application of a Typical Cyclic Volatile Methylsiloxane(cVMSs)Detection Method in Domestic Wastewater
Cyclic volatile methylsiloxanes(cVMSs)are highly volatile,making their monitoring subject to high background interference,which affects data accuracy.By comprehensively optimizing factors such as injection septum,injection bottle insert,and sample preservation methods,the optimal pretreatment conditions were determined.An analytical method for detecting trace amounts of octamethylcyclotetrasiloxane(D4),decamethylcyclopentasiloxane(D5),and dodecamethylcyclohexasiloxane(D6)in water using gas chromatography-mass spectrometry(GC-MS)was established and applied to the detection of D4,D5,and D6 concentrations in actual domestic wastewater.The results showed that the method detection limits ranged from 1.43 to 3.14 ng/L,with average recoveries of 92.2％to 110.6％and 75.1％to 91.2％at spiked concentrations of 5 and 0.5 μg/L,respectively.The detection results for actual domestic wastewater indicated that the average concentrations of D5 and D6 in influent were 1 071 and 524 ng/L,respectively,with D4 not detected;D4,D5,and D6 were not detected in any effluent samples.The sample pretreatment and GC-MS detection method is simple and can significantly reduce background interference,providing a reference method for the detection and analysis of cVMSs in wastewater and supporting decision-making for environmental regulatory agencies.
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