Figure 1From: Time-dependent integrity during storage of natural surface water samples for the trace analysis of pharmaceutical products, feminizing hormones and pesticidesEffect of various storage periods on recovery (%) of pharmaceuticals, pesticides, hormones (synthetic and natural estrogens and progestogens) dissolved in surface water at 100 ng l-1 Level. The error bar lengths represent the relative standard deviations on mean recovery (recovery for three replicates). Bars with the same letters are not statistically different p > 0.05 level using a Tukey's-b post hoc test.Back to article page