Initial Solution (mL)

Hydroxylammonium Chloride 10% (mL)

Sodium Acetate 2M (mL)

Ortho-Phenanthroline

0.25% (mL)

Final Concentration [Fe2+] (mole∙L−1)

1

10

1

8

4 × 10−7

2

10

2

8

8 × 10−7

3

10

3

8

1.2 × 10−6

4

10

4

8

1.6 × 10−6

5

10

5

8

2 × 10−6

6

10

6

8

2.4 × 10−6

7

10

7

8

2.8 × 10−6