水样500 ml，取50 ml上清液中的一滴2.5 μL，单位：长 × 宽/μm²

采样点1

2 × 1.5

2 × 0.5

1 × 1

0.5 × 0.5

0.3 × 0.3

1 × 0.2

1.5 × 1

1.5 × 1

1 × 1

2 × 1.5

1 × 1

0.5 × 0.5

3 × 2.5

1 × 1

1.5 × 2

0.5 × 0.5

2 × 1

2 × 2

1 × 0.5

3 × 4

1 × 1

1 × 0.7

4 × 2

0.5 × 0.5

1.5 × 1.5

4 × 2

3 × 7

1.5 × 1.5

4 × 4

1 × 1

采样点2

1.5 × 1.5

2 × 0.5

4 × 1.5

2 × 2

1 × 0.5

2 × 2

4 × 3

8 × 3

1 × 1

0.5 × 1

8 × 8

0.5 × 0.5

4 × 2

5 × 4

8 × 4

4 × 2

4 × 2

3 × 1

4 × 1.5

0.7 × 0.7

3 × 4

1 × 3

7 × 6

2 × 1.5

6 × 3

4 × 2

3 × 3

4 × 2

采样点3

1 × 1

2 × 1

1.5 × 2

1 × 0.5

1 × 0.7

1 × 1.5

2 × 0.5

0.5 × 0.5

0.7 × 0.7

1 × 1

1 × 0.5

1 × 0.2

3 × 3

3 × 2

4 × 4

2 × 1.5

1 × 1

6 × 4

4 × 2

4 × 2

1 × 1

0.7 × 0.7

4 × 2

2 × 2

1 × 1

3 × 4

2 × 3

1 × 1

1 × 1

2 × 0.7

4 × 4

6 × 3