Table 3 Chemical analytics of sediments from the main sampling sites concerning PAH, PCB and (heavy) metal contents, as well as the proportion of total organic carbon (TOC) exemplarily shown for the sampling event in winter/spring 2016

Benz[a]anthracen (mg/kg)

0.150

0.104

0.163

0.170

0.065

0.175

0.026

0.106

0.061

0.043

0.315

0.174

0.222

< LOQ

Benzo[a]pyrene (mg/kg)

0.088

0.086

0.166

0.155

0.074

0.186

0.034

0.117

0.079

0.055

n.a

0.208

0.219

0.008

Fluoranthene (mg/kg)

0.370

0.232

0.369

n.a

n.a

n.a

0.084

0.263

0.119

0.087

0.712

0.431

0.749

0.009

Fluorene (mg/kg)

0.011

0.016

0.024

n.a

0.013

0.024

0.005

0.013

0.007

0.006

0.014

0.009

0.023

0.002

Phenanthrene (mg/kg)

0.134

0.111

0.222

n.a

0.099

0.289

0.062

0.142

0.067

0.042

0.188

0.122

0.349

0.009

Pyrene (mg/kg)

0.245

0.152

0.252

0.212

0.090

n.a

0.059

0.200

0.091

0.063

0.453

0.281

0.462

0.005

PCB 28 (µg/kg)

0.014

0.110

0.266

0.420

0.193

0.410

0.020

0.030

0.125

0.137

0.072

0.076

0.052

0.103

PCB 52 (µg/kg)

0.029

0.464

0.486

1.219

0.359

0.586

0.028

0.286

1.390

0.194

0.099

0.272

0.280

0.169

PCB 101 (µg/kg)

0.262

3.932

1.594

2.824

0.946

2.835

0.081

2.043

3.486

0.703

0.436

1.008

1.223

1.006

PCB 138 (µg/kg)

0.498

9.366

5.504

5.646

2.785

6.763

0.169

3.618

4.430

2.479

1.093

3.116

1.966

1.869

PCB 153 (µg/kg)

0.645

11.98

6.248

6.365

3.435

8.561

0.268

4.321

4.142

2.894

1.469

3.437

2.175

2.714

PCB 180 (µg/kg)

0.456

10.34

5.425

4.089

2.583

5.611

< LOQ

2.597

2.252

2.009

0.860

1.920

1.317

1.632

Arsenic (mg/kg)

< LOQ

7.626

< LOQ

< LOQ

5.815

10.83

< LOQ

5.935

< LOQ

< LOQ

12.25

10.87

18.81

60.64

Cadmium (mg/kg)

0.315

0.527

0.252

0.296

0.388

0.572

0.220

0.344

0.320

0.425

0.385

0.263

0.719

1.205

Chromium (mg/kg)

173.8

199.4

113.9

103.6

123.9

101.7

136.9

113.9

114.5

128.1

62.42

66.18

84.61

86.88

Copper (mg/kg)

31.80

52.65

26.01

20.80

29.68

32.64

18.21

22.42

21.52

29.35

26.94

26.94

56.69

52.12

Lead (mg/kg)

27.96

45.52

30.83

24.29

29.50

44.02

20.15

21.29

20.38

25.13

38.39

62.23

121.3

137.0

Mercury (mg/kg)

0.083

0.096

0.180

0.107

0.152

0.156

0.052

0.043

0.067

0.140

0.065

0.083

0.115

0.248

Nickel (mg/kg)

112.9

171.8

84.53

72.73

87.15

71.51

116.9

110.3

86.95

102.8

52.81

52.42

82.89

71.47

Zinc (mg/kg)

142.7

224.9

155.9

132.0

219.5

529.5

103.6

120.1

151.7

202.0

133.9

222.8

426.3

1287

TOC (%)

0.540

0.552

4.409

3.113

2.136

3.281

2.191

1.515

3.907

3.922

0.816

5.253

0.454

0.663