Table 1 System analytical performance parameters for the developed method.

From: Simultaneous determination of nineteen azo dyes in water samples by gas chromatography-mass spectrometry after Fe3O4@COF based dispersive solid phase extraction

Analyte

LOD, μg/kg

LOQ, μg/kg

LR, μg/kg

R2

%RSD

4-aminobiphenyl

10.2

33.9

27-1947.2

0.9966

10.3

Benzidine

17.9

59.5

52.3–507

1.000

12.2

4-chloro-2-methylaniline

8.0

26.5

27–507

0.9999

9.7

2-naphthylamine

12.2

40.7

52.3–507

0.9974

11.9

o-aminoazotoluene

15.0

49.9

52.3-1947.2

0.9985

12.3

2-amino-4-nitrotoluene

32.3

107.7

102.7-1947.2

0.9991

8.0

4-chloroaniline

18.5

61.8

52.3–507

0.9985

9.9

4,4’-methylenedianiline

28.5

94.8

102.7–507

1.000

6.2

3.3’-dichlorobenzidine

6.2

20.8

27–507

0.9988

12.0

3,3’-dimethylbenzidine

3.7

12.2

13.1-253.4

0.9994

12.8

4,4’-diamino-3,3’-dimethyldiphenylmethane

2.8

9.5

13.1-253.4

0.9992

10.6

4,4’-oxydianiline

27.3

91.1

102.7–507

0.9997

9.9

4,4’-thiodianaline

70.7

235.7

253.4-1947.2

0.9998

7.4

2,4,5-trimethylaniline

5.4

18.0

27-253.4

0.9991

7.9

o-anisidine

8.3

27.6

27-253.4

0.9987

10.3

3,3’-dimethoxybenzidine

6.1

20.4

27-253.4

1.000

12.3

p-cresidine

7.5

25.1

27-253.4

0.9991

10.7

4,4’-dimethylene bis (2-chloroaniline)

5.4

18.0

27–507

0.9996

12.2

2,4-dimethylaniline

8.7

28.9

27-253.4

0.9988

8.6