| Amount of NO− 3 (mg∙L−1) | |||
Sample | Lettuce | Cauliflower | Spinach | Arugula |
VC1 | 3.48 ± 0.83 | 2.87 ± 0.23 | 17.20 ± 0.72 | 8.61 ± 0.64 |
VC2 | 3.83 ± 0.52 | 3.41 ± 0.31 | 20.34 ± 0.98 | 9.52 ± 0.33 |
VC3 | 4.02 ± 0.96 | 2.96 ± 0.19 | 18.48 ± 0.67 | 9.26 ± 0.54 |
JQ1 | 1.63 ± 0.40 | 1.86 ± 0.12 | 11.23 ± 0.35 | 2.61 ± 0.22 |
JQ2 | 1.54 ± 0.34 | 1.65 ± 0.48 | 12.63 ± 0.85 | 3.04 ± 0.31 |
JQ3 | 1.59 ± 0.52 | 2.15 ± 0.63 | 12.15 ± 0.76 | 2.96 ± 0.54 |
PO1 | 1.19 ± 0.89 | 1.55 ± 0.72 | 16.38 ± 0.65 | 6.73 ± 0.62 |
PO2 | 1.36 ± 0.12 | 1.46 ±0.65 | 14.25 ± 0.86 | 5.96 ± 0.71 |
PO3 | 2.05 ± 0.19 | 1.32 ±0.48 | 16.43 ± 1.22 | 6.23 ±0.25 |