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HPLC chromatograms of non-spiked river water extracted with (a) C18 cartridge and (b) MIP cartridge, (c) spiked river water at 10 μg L−1 concentration level extracted with MIP cartridge and (d) the corresponding standard solution. Peak identifications: 1, colistin B; 2, colistin A; 3 polymyxin B.
