Table 1.
Levels of 24 selected elements measured in bee pollen along with mean, standard deviations (SD), and relative standard deviation (%RSD) values, calculated for each year separately and all samples in total; 1, 2, 3—samples collected in 6 May, 23 June and 8 July 2018, respectively; 4, 5, 6—samples collected in 16 May, 2 June and 20 July 2019, respectively. Values of mean and SD are expressed in mg/kg.
| Element | 1 | 2 | 3 | Year 2018 | 4 | 5 | 6 | Year 2019 | Years 2018 and 2019 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| [mg/kg] | Mean + SD | %RSD | [mg/kg] | Mean + SD | %RSD | Mean + SD | %RSD | |||||
| Ag | 0.18 | 0.28 | 0.04 | 0.17 ± 0.12 | 72.33 | 0.05 | 0.09 | 0.05 | 0.06 ± 0.02 | 36.46 | 0.12 ± 0.10 | 83.54 |
| Al | 53.00 | 25.00 | 11.00 | 29.67 ± 21.39 | 72.09 | 7.20 | 9.60 | 51.00 | 22.60 ± 24.62 | 108.96 | 26.13 ± 20.99 | 80.31 |
| As | 0.03 | 0.03 | 0.01 | 0.02 ± 0.01 | 48.42 | 0.01 | 0.01 | 0.03 | 0.02 ± 0.01 | 79.52 | 0.03 ± 0.01 | 57.55 |
| Ba | 0.84 | 0.57 | 0.51 | 0.64 ± 0.18 | 27.47 | 0.25 | 0.65 | 1.00 | 0.63 ± 0.38 | 59.25 | 0.64 ± 0.26 | 41.17 |
| Ca | 1800.00 | 1500.00 | 450.00 | 1250.00 ± 708.87 | 56.71 | 1500.00 | 1500.00 | 680.00 | 1226.67 ± 473.47 | 38.59 | 1238.33 ± 539.27 | 43.55 |
| Cd | 0.02 | 0.11 | 0.03 | 0.05 ± 0.05 | 91.14 | 0.02 | 0.04 | 0.12 | 0.06 ± 0.06 | 96.25 | 0.06 ± 0.05 | 84.12 |
| Co | 0.03 | 0.05 | 0.02 | 0.03 ± 0.02 | 49.01 | 0.04 | 0.05 | 0.04 | 0.042 ± 0.003 | 7.16 | 0.038 ± 0.012 | 30.99 |
| Cr | 0.12 | 0.08 | 0.04 | 0.08 ± 0.04 | 50.00 | 0.04 | 0.03 | 0.11 | 0.06 ± 0.04 | 76.82 | 0.07 ± 0.04 | 57.54 |
| Cu | 5.30 | 5.30 | 2.40 | 4.33 ± 1.67 | 38.64 | 5.40 | 5.70 | 4.40 | 5.17 ± 0.68 | 13.17 | 4.75 ± 1.23 | 25.91 |
| Fe | 75.00 | 57.00 | 22.00 | 51.33 ± 26.95 | 52.50 | 24.00 | 49.00 | 68.00 | 47.00 ± 22.07 | 46.95 | 49.17 ± 22.16 | 45.07 |
| K | 4500.00 | 4100.00 | 4300.00 | 4300.00 ± 200.00 | 4.65 | 3500.00 | 4600.00 | 4400.00 | 4166.67 ± 585.95 | 14.06 | 4233.33 ± 398.33 | 9.41 |
| Mg | 1100.00 | 720.00 | 620.00 | 813.33 ± 253.25 | 31.15 | 980.00 | 1000.00 | 520.00 | 833.33 ± 271.54 | 32.58 | 823.33 ± 235.09 | 28.55 |
| Mn | 16.00 | 21.00 | 13.00 | 16.67 ± 4.04 | 24.25 | 22.00 | 62.00 | 16.00 | 33.33 ± 25.07 | 75.02 | 25.00 ± 18.44 | 73.76 |
| Mo | 0.31 | 0.29 | 0.16 | 0.25 ± 0.08 | 32.15 | 0.18 | 0.30 | 0.16 | 0.21 ± 0.08 | 35.49 | 0.23 ± 0.07 | 31.57 |
| Na | 25.00 | 32.00 | 14.00 | 23.67 ± 9.07 | 38.34 | 24.00 | 24.00 | 32.00 | 26.67 ± 4.62 | 17.32 | 25.17 ± 6.65 | 26.41 |
| Ni | 0.63 | 0.83 | 0.37 | 0.61 ± 0.23 | 37.81 | 0.66 | 0.74 | 0.67 | 0.69 ± 0.04 | 6.32 | 0.65 ± 0.15 | 23.81 |
| P | 4600.00 | 4100.00 | 3200.00 | 3966.67 ± 709.46 | 17.89 | 4300.00 | 4600.00 | 3500.00 | 4133.33 ± 568.62 | 13.76 | 4050.00 ± 582.24 | 14.38 |
| Pb | 0.17 | 0.19 | 0.12 | 0.16 ± 0.04 | 22.53 | 0.14 | 0.09 | 0.22 | 0.15 ± 0.07 | 45.35 | 0.15 ± 0.05 | 31.59 |
| S | 2700.00 | 2600.00 | 1,800.00 | 2366.67 ± 493.29 | 20.84 | 2600.00 | 2700.00 | 1900.00 | 2400.00 ± 435.89 | 18.16 | 2383.33 ± 416.73 | 17.49 |
| Sb | 0.007 | 0.013 | 0.005 | 0.008 ± 0.004 | 49.033 | 0.004 | 0.008 | 0.016 | 0.009 ± 0.006 | 64.58 | 0.009 ± 0.005 | 52.45 |
| Se | 0.04 | 0.06 | 0.04 | 0.05±0.01 | 32.46 | 0.02 | 0.03 | 0.09 | 0.05 ± 0.04 | 82.58 | 0.05 ± 0.03 | 56.12 |
| Si | 75.00 | 45.00 | 20.00 | 46.67 ± 27.54 | 59.01 | 8.50 | 22.00 | 71.00 | 33.83 ± 32.89 | 97.20 | 40.25 ± 28.02 | 69.63 |
| V | 0.11 | 0.05 | 0.03 | 0.06 ± 0.045 | 70.84 | 0.05 | 0.02 | 0.11 | 0.06 ± 0.05 | 76.48 | 0.06 ± 0.04 | 65.88 |
| Zn | 27.00 | 28.00 | 35.00 | 30.00 ± 4.36 | 14.53 | 26.00 | 31.00 | 41.00 | 32.67 ± 7.64 | 23.38 | 31.33 ± 5.75 | 18.35 |