Table 1 Recoveries of NO₂^- and NO₃^- in extracted KNO₂/KNO₃ standards (Mean ± SD, n = 8)

48 nM

90.7 ± 1.9

28.3 ± 3.4

97 nM

94.5 ± 6.2

54.8 ± 4.3

195 nM

94.7 ± 5.9

87.8 ± 5.1

390 nM

93.4 ± 4.0

80.2 ± 1.5

780 nM

93.6 ± 1.9

93.7 ± 4.5

1.56 μM

93.7 ± 2.9

87.9 ± 3.9

3.12 μM

91.8 ± 1.6

95.2 ± 2.9

6.25 μM

98.5 ± 2.4

98.5 ± 3.1

12.5 μM

97.1 ± 1.8

94.8 ± 1.9

25 μM

99 ± 5.4

100.5 ± 3.2

50 μM

100 ± 5.8

97.3 ± 2.9

100 μM

97.1 ± 2.4

99.2 ± 4.9