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Absolute spiking recoveries of target NPSs (n = 3) at (A) 50 or 100 ppb and (B) 2 or 4 ppb using HLB-N (pH ~ 7 sample using HLB), HLB-A (pH ~ 2 sample using HLB), MCX, and WCX cartridges. mCPP: 1-(3-chlorophenyl) piperazine; MMMP: 2-methyl-4′-(methylthio)-2-morpholinopropiophenone; 5IT: 5-(2-aminopropyl) Indole.
