Search Articles

View query in Help articles search

Search Results (1 to 2 of 2 Results)

Download search results: CSV END BibTex RIS


Analysis of Wastewater Samples to Explore Community Substance Use in the United States: Pilot Correlative and Machine Learning Study

Analysis of Wastewater Samples to Explore Community Substance Use in the United States: Pilot Correlative and Machine Learning Study

Gradient separation was carried out using a Hypurity C18 reverse phase HPLC column (250 mm × 2.1 mm × 5 µm particle size) at a temperature of 50 °C and a flow rate of 0.2 m L/minute. Electrospray ionization was carried out in a positive mode. MS capillary voltage was 4000 V, the gas flow was 12 L/minute, and nebulizer pressure was 40 psi. Mass transitions, fragmentor voltages, collision energies, and instrument detection limits of each compound are given in Table 1.

Marie A Severson, Sathaporn Onanong, Alexandra Dolezal, Shannon L Bartelt-Hunt, Daniel D Snow, Lisa M McFadden

JMIR Form Res 2023;7:e45353

Population Health Metrics During the Early Stages of the COVID-19 Pandemic: Correlative Pilot Study

Population Health Metrics During the Early Stages of the COVID-19 Pandemic: Correlative Pilot Study

Sulfate (Et S) and glucuronide (Et G) metabolites of ethanol were analyzed by isotope dilution using a Xevo TQ-S micro triple quadrupole mass analyzer interfaced with an Acquity UHPLC and Uni Spray TM ionization source in a negative-ion-detection-mode spectrometer (Waters Corporation, Milford, MA). An Acquity BEH C18 column (2.1 mm × 50 mm, 1.7 µm) was used for separation at a flow rate of 0.6 m L/minute and a temperature of 40 °C.

Marie A Severson, David A Cassada, Victor C Huber, Daniel D Snow, Lisa M McFadden

JMIR Form Res 2022;6(10):e40215