Table 1 Site and extracted DOM characteristics

From: Dissolved organic matter thiol concentrations determine methylmercury bioavailability across the terrestrial-marine aquatic continuum

Site characteristics

Extracted DOM characteristics

Site

US state

System type

Latitude (degrees)

Longitude (degrees)

Salinity (psu)

DOC (µM)

DOM-RSH in water (nM)

% C

% N

% S

C/S (mol ratio)

C/N (mol ratio)

RSH/DOC (μmol/mol)

Log K1

SR

DE

Marsh

39.58

-75.48

4.0

289

71.0

45.6

1.5

1.6

76

37

246 +/- 11

16.2

BC

NJ

Marsh

40.83

-74.08

4.7

590

215

52.5

2.1

2.0

69

29

364 +/- 23

16.8

BI

CT

Marsh

41.34

-71.88

28

258

108

53.4

2.5

4.4

32

25

418 +/- 31

16.5

SI

MA

Marsh

42.75

-70.84

33

553

187

52.6

1.9

2.0

70

32

338 +/- 18

16.3

OS

CT

River

41.31

-73.09

0.6

245

26.1

49.1

1.9

0.9

140

30

107 +/- 6

16.3

PAW

RI

River

41.37

-71.83

0.5

291

26.2

60.7

1.9

1.0

160

37

90 +/- 35

16.5

HC

CT

River

41.38

-72.35

2.2

282

36.2

49.1

1.5

0.9

148

38

128 +/- 4

16.1

OR

ME

River

44.69

-68.82

4.7

422

18.7

51.0

0.8

0.5

253

77

44 +/- 3

16.4

CM

DE

Estuary

38.94

-74.97

32

134

15.5

50.1

2.2

2.0

65

27

115 +/- 11

16.4

NB

NJ

Estuary

40.67

-74.13

22

236

23.0

47.2

2.1

2.4

52

26

97 +/- 9

16.7

CI

NY

Estuary

40.85

-73.78

28

177

13.1

54.9

2.7

2.0

74

23

74 +/- 5

16.7

ST

CT

Estuary

41.17

-73.11

18

206

34.8

39.4

1.5

1.2

88

30

169 +/- 7

17.0

CTR

CT

Estuary

41.29

-72.35

21

191

13.6

49.9

2.0

1.1

125

30

71 +/- 4

16.2

NBD

MA

Estuary

41.65

-70.91

32

194

14.3

N/A

N/A

1.4

N/A

N/A

74 +/- 28

N/A

PI

MA

Estuary

42.82

-70.82

30

150

28.5

48.8

2.0

2.6

50

29

190 +/- 20

N/A

CP

MA

Estuary

42.82

-70.88

9.7

233

11.4

55.6

2.1

1.3

113

31

49 +/- 3

17.4

MP

ME

Estuary

44.43

-68.94

32

158

14.6

54.2

1.5

1.3

108

43

92 +/- 10

N/A

M

ME

Estuary

44.59

-68.86

15

285

11.2

56.9

1.2

0.6

261

55

39 +/- 1

16.2

SB

CT

Shelf

39.84

-70.74

36

116

5.1

53.1

2.2

0.7

212

28

44 +/- 5

16.6

GOM

ME

Shelf

42.85

-70.48

32

117

8.9

50.2

1.9

1.4

96

31

76 +/- 8

16.6

  1. 1The specified Log K values (uncertainty ±0.19) corresponds to the reaction Eq. (2).
  2. Classification and location of the study sites and selected key parameters of the sites and extracted dissolved organic matter (DOM) samples. The site locations are within the United States and are shown in Fig. 1. System types were determined based on individual site features and local salinity, as defined in the text. The carbon (C), nitrogen (N), and sulfur (S) percentages were calculated by weight. Site specific thiol concentrations (DOM-RSH in water) were calculated by multiplying the thiol (RSH) to dissolved organic carbon (DOC) ratio (µmol/mol) by the in situ DOC concentration.
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