Time/min

Concentration of NaNO₂ (%)

0.6

1.0

1.4

1.8

30

0.27

0.32

0.51

0.85

60

0.37

0.89

1.06

1.66

120

1.09

1.41

2.35

3.58

180

1.33

2.22

3.43

5.30

300

2.75

4.40

6.80

8.19