Table 3.
Prevalence of the nitrite concentrations with accompanying nitrate concentrations in these samples.
| No. of Samples with NO2 above the LOQ | % | Samples with Nitrite Concentrations above the LOQ (1 mg kg−1) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| mg kg−1 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | |||
| Lettuce | 5 | 23.8 | nitrate nitrite |
764.0 | 262 | 747.7 | 1157.6 | 3184.2 | ||
| 98.9 | 55.9 | 378.1 | 28.4 | 21.1 | ||||||
| Swiss chard | 7 | 41.2 | nitrate | 2408.3 | 3055.9 | 242.4 | 233.4 | 2661.3 | 3558.4 | 1571.0 |
| nitrite | 30.4 | 57.6 | 167.0 | 6.1 | 80.4 | 5.8 | 4.1 | |||
| Rucola | 4 | 40.0 | nitrate | 4427.6 | 2046.6 | 2262.4 | 4526.3 | |||
| nitrite | 22.9 | 55.2 | 537.9 | 2.7 | ||||||
| Mixed salads | 6 | 54.5 | nitrate | 653.8 | 952.6 | 54.6 | 577.9 | 908.2 | 882.3 | |
| nitrite | 31.6 | 14.7 | 308.6 | 11.3 | 16.6 | 29.3 | ||||
| Lamb’s lettuce | 2 | 28.6 | nitrate | 1647.6 | 1382.9 | |||||
| nitrite | 3.3 | 32.5 | ||||||||
| Spinach | 3 | 37.5 | nitrate | 2350.9 | 489.8 | 1006.2 | ||||
| nitrite | 192.0 | 327.1 | 53.6 | |||||||
LOQ, limit of quantitation = 1 mg kg−1.