Figure 2From: Time-dependent integrity during storage of natural surface water samples for the trace analysis of pharmaceutical products, feminizing hormones and pesticidesSPE-LC-ESI-MS/MS SRM chromatograms of pharmaceuticals and pesticides obtained after 21 days of storage at 4°C in surface water (pH = 2.8) spiked at 100 ng l-1 level and with 2.5% of MeOH added.Back to article page