试验号

A

B

C

D

去除率(%)

1

1 (硫酸锌)

1 (1/0.2)

1 (550)

1 (1)

49.21

2

1

2 (1/0.5)

2 (650)

2 (2)

43.87

3

1

3 (1/1)

3 (750)

3 (3)

46.22

4

2 (硫酸铝)

1

2

3

44.51

5

2

2

3

1

44.08

6

2

3

1

2

47.93

7

3 (硫酸镁)

1

3

2

41.73

8

3

2

1

3

58.31

9

3

3

2

1

51.26

k₁

46.43

45.15

51.82

48.18

k₂

45.51

48.77

46.55

44.51

k₃

50.43

48.47

44.01

49.68

极差R

4.92

3.62

7.81

5.17