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Table 3 Coefficient of variation (CV) of cell numbers at the end of the test (72 h) for in vitro and in vivo measurements (absolute values as well as the ratio of the in vivo and in vitro values)

From: Testing particles using the algal growth inhibition test (OECD 201): the suitability of in vivo chlorophyll fluorescence measurements

Material

Chlorophyll measurement

Control

0.1 mg/L

1 mg/L

10 mg/L

1000 mg/L

Fibers

Cu

CV in vitro

12.7

65.6

39.2

a

a

CV in vivo

2.7

46.1

4.6

a

a

Ratio in vitro/in vivo

4.7

1.4

8.5

a

a

TiO2_fibers

CV in vitro

6.4

18.3

34.8

1.2

3.3

CV in vivo

1.2

2.3

1.5

0.1

0.3

Ratio in vitro/in vivo

81.2

43.7

67.7

760.1

305.2

SiC_thin

CV in vitro

13.8

14.0

33.5

55.8

32.3

CV in vivo

3.4

18.9

13.9

34.6

5.7

Ratio in vitro/in vivo

4.1

0.7

2.4

1.6

5.7

Platelets

Ag-ES-4

CV in vitro

18.1

17.8

20.0

16.1

0.0

CV in vivo

14.9

17.3

15.5

4.0

0.0

Ratio in vitro/in vivo

1.2

1.0

1.3

4.0

0.0

Spheres / compact particles

PMMA

CV in vitro

36.6

n.d.b

15.4

7.0

31.2

CV in vivo

5.7

n.d.b

6.3

5.1

8.4

 

Ratio in vitro/in vivo

6.4

a

2.4

1.4

3.7

PE_broad distribution

CV in vitro

8.5

n.d.b

n.d.b

17.7

11.5

CV in vivo

2.7

n.d.b

n.d.b

5.3

3.9

Ratio in vitro/in vivo

3.1

a

a

3.3

2.9

PA-6

CV in vitro

4.4

n.d.b

n.d.b

12.1

10.2

CV in vivo

4.7

n.d.b

n.d.b

2.5

9.1

Ratio in vitro/in vivo

0.9

a

a

4.8

1.1

IN718

CV in vitro

30.3

51.1

3.2

42.2

33.8

CV in vivo

23.1

45.3

9.0

40.3

38.4

Ratio in vitro/in vivo

1.3

1.1

0.4

1.0

0.9

Ti64

CV in vitro

15.8

17.5

21.9

25.5

11.0

CV in vivo

5.3

17.8

13.2

18.2

6.9

Ratio in vitro/in vivo

3.0

1.0

1.7

1.4

1.6

IN-Y2O3

CV in vitro

18.4

n.d.b

6.9

10.2

7.0

CV in vivo

13.4

n.d.b

6.8

9.4

2.4

Ratio in vitro/in vivo

1.4

n.d.b

1.0

1.1

2.9

Ti64-SiC

CV in vitro

10.3

36.8

22.8

9.7

4.5

CV in vivo

4.1

4.2

4.2

4.3

3.0

Ratio in vitro/in vivo

2.5

8.8

5.4

2.3

1.5

  1. a100% toxicity; no calculation possible. bn.d. = not determined