Sample

Amount of NO− 3 (mg∙L−1)

Recovery (%)

Added

Found

Lettuce

0.0

-

5.0

5.4

108.0

10.0

11.5

115.0

Cauliflower

0.0

-

5.0

5.8

116.0

10.0

11.3

113.0

Spinach

0.0

-

5.0

4.7

94.0

10.0

9.4

94.0

Arugula

0.0

-

5.0

5.7

114.0

10.0

10.8

108.0