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a) Analysis of imatinib in blood (10–4000 ng/mL) using paper spray ionization, capillary sampler coated with imatinib-d8. DC voltage (4.2 kV) was applied to the paper wetted with 35 μL spray solvent (acetonitrile/water, 90:10, v:v). Inset shows the low-concentration range. b) Analysis of atrazine in river water (10–500 ng/mL) using LTP. c) Analysis of cocaine in urine (30–1000 ng/mL) using DESI. TSQ used in MRM mode for paper spray, Exactive Orbitrap used in MS mode for LTP and DESI.
