Table 1 Selenium (Se) concentrations and proportions in Kohala soil water and NaOH extracts, and comparison between Se oxyanions proportion and Se species recovery obtained with anion exchange chromatography (AEC) and size exclusion chromatography (SEC) coupled to ICP-MS/MS

From: Understanding soil selenium accumulation and bioavailability through size resolved and elemental characterization of soil extracts

 

Water extracts

Sample (depth; horizon)

Se concentration (µg L−1)

Se proportionb (% soil Se)

Seoxyanions by AECc (% Sewater)

Unrecovered Se by AECc (% Sewater)

Seoxyanions by SECd (% Sewater)

Recovered Se by SECd (% Sewater)

S1 (0–10 cm; A)

1.0 ± 0.1

1.2 ± 0.1

26 ± 2

74 ± 8

24 ± 2

68 ± 6

S1 (10–20 cm; B)

2.1 ± 0.2

0.51 ± 0.08

60 ± 5

40 ± 10

70 ± 6

83 ± 8

S2 (0–10 cm; A)

1.3 ± 0.1

1.2 ± 0.2

23 ± 2

77 ± 8

19 ± 1

66 ± 4

S2 (10–20 cm; B)

2.3 ± 0.2

1.0 ± 0.1

30 ± 3

70 ± 9

35 ± 4

88 ± 9

S3 (0–10 cm; A)

5.8 ± 0.4

2.7 ± 0.2

14 ± 1

86 ± 9

15 ± 1

106 ± 12

S3 (10–20 cm; A)

3.2 ± 0.1

1.96 ± 0.08

23 ± 1

77 ± 5

15 ± 1

109 ± 4

S3 (20–30 cm; B)

1.9 ± 0.1

2.07 ± 0.08

19 ± 1

81 ± 4

13 ± 1

82 ± 3

S3 (30–40 cm; B)

1.4 ± 0.1

2.0 ± 0.5

35 ± 3

65 ± 9

35 ± 3

69 ± 5

S3 (40–50 cm; B)

0.8 ± 0.1

1.7 ± 0.5

33 ± 3

67 ± 12

34 ± 3

58 ± 5

S4 (0–10 cm; A)

3.8 ± 0.1

1.22 ± 0.04

3.9 ± 0.3

96 ± 5

12 ± 3

93 ± 6

S4 (10–20 cm; A)

3.0 ± 0.3

1.0 ± 0.1

5.5 ± 0.6

95 ± 14

13 ± 1

77 ± 8

S4 (20–30 cm; A)

2.5 ± 0.1

0.91 ± 0.06

6.7 ± 0.6

93 ± 6

8.5 ± 0.4

68 ± 3

S4 (30–40 cm; B)

1.6 ± 0.1

0.9 ± 0.1

10 ± 1

90 ± 11

14 ± 1

72 ± 6

S4 (40–50 cm; B)

1.59 ± 0.04

0.81 ± 0.04

14 ± 1

86 ± 4

27 ± 1

73 ± 2

S4 (50–60 cm; B)

0.83 ± 0.04

0.45 ± 0.03

17 ± 2

83 ± 7

42 ± 2

80 ± 4

S4 (60–70 cm; B)

0.9 ± 0.1

0.65 ± 0.08

25 ± 2

75 ± 8

35 ± 2

79 ± 5

S5 (0–10 cm; A)

8.3 ± 0.1

1.5 ± 0.2

<0.5

>99

Undetected

95 ± 3

S5 (10–20 cm; A)

6.5 ± 0.3

1.08 ± 0.07

<3

>99

Undetected

97 ± 4

S5 (20–30 cm; B)

2.34 ± 0.05

0.49 ± 0.04

<6

>97

Undetected

80 ± 2

S5 (30–40 cm; B)

2.54 ± 0.02

0.57 ± 0.04

<7

>97

Undetected

85 ± 1

S6 (10–20 cm; A)

12.1 ± 0.2

2.9 ± 0.1

<7

>99

Undetected

94 ± 3

S6 (20–30 cm; B)

1.9 ± 0.2

0.27 ± 0.02

<0.7

>97

Undetected

70 ± 6

S6 (30–40 cm; B)

0.9 ± 0.1

0.17 ± 0.03

<0.9

>94

Undetected

72 ± 7

S6 (40–50 cm; B)

0.9 ± 0.1

0.20 ± 0.03

<3

>93

Undetected

75 ± 7

S6 (50–60 cm; B)

0.8 ± 0.1

0.20 ± 0.02

<2

>93

Undetected

60 ± 6

 

NaOH extracts

Sample (depth; horizon)

Se concentration (µg L−1)

Se proportionb (% soil Se)

Seoxyanions by AECc (%SeNaOH)

Unrecovered Se by AECc (%SeNaOH)

Seoxyanions by SECd (%SeNaOH)

Recovered Se by SECd (%SeNaOH)

S1 (0–10 cm; A)

3.8 ± 0.4

32 ± 4

42 ± 4

58 ± 6

40 ± 2

102 ± 9

S1 (10–20 cm; B)

31.2 ± 0.6

53 ± 7

63 ± 5

37 ± 3

56.1 ± 0.7

108 ± 3

S2 (0–10 cm; A)

6.7 ± 0.2

39 ± 5

36.1 ± 0.9

64 ± 2

34.1 ± 0.9

102 ± 6

S2 (10–20 cm; B)

23 ± 1

66 ± 7

52 ± 2

48 ± 2

44.2 ± 0.5

102 ± 3

S3 (0–10 cm; A)

20 ± 1

59 ± 3

23 ± 1

77 ± 4

30.8 ± 0.4

101 ± 4

S3 (10–20 cm; A)

15.7 ± 0.2

61 ± 3

36 ± 2

64 ± 3

35.1 ± 0.6

97 ± 2

S3 (20–30 cm; B)

9 ± 1

67 ± 4

37 ± 2

63 ± 4

39.4 ± 0.8

95 ± 6

S3 (30–40 cm; B)

6.2 ± 0.6

57 ± 15

42 ± 12

58 ± 17

38.0 ± 0.8

95 ± 5

S3 (40–50 cm; B)

4.3 ± 0.4

56 ± 17

47 ± 7

53 ± 7

51 ± 4

99 ± 6

S4 (0–10 cm; A)

27 ± 1

60 ± 1

18.4 ± 0.4

82 ± 2

25.1 ± 0.4

96 ± 5

S4 (10–20 cm; A)

29.7 ± 0.6

66 ± 3

29 ± 1

71 ± 3

32.8 ± 0.5

100 ± 1

S4 (20–30 cm; A)

28.4 ± 0.4

70 ± 4

34 ± 1

66 ± 2

31.3 ± 0.4

103 ± 5

S4 (30–40 cm; B)

19 ± 1

68 ± 9

19 ± 1

81 ± 5

19.3 ± 0.3

101 ± 5

S4 (40–50 cm; B)

21.6 ± 0.6

69 ± 7

22 ± 2

78 ± 7

20.1 ± 0.3

105 ± 3

S4 (50–60 cm; B)

17.0 ± 0.8

62 ± 5

25 ± 2

75 ± 6

23.9 ± 0.4

108 ± 11

S4 (60–70 cm; B)

14.9 ± 0.6

69 ± 8

26 ± 1

74 ± 3

24.8 ± 0.4

112 ± 8

S5 (0–10 cm; A)

68 ± 3

76 ± 12

12 ± 1

88 ± 6

11.0 ± 0.2

99 ± 3

S5 (10–20 cm; A)

79 ± 7

86 ± 7

29 ± 3

71 ± 6

27.1 ± 0.4

97 ± 2

S5 (20–30 cm; B)

55 ± 4

72 ± 5

33 ± 2

67 ± 4

30.2 ± 0.6

99 ± 2

S5 (30–40 cm; B)

55 ± 5

79 ± 9

27 ± 2

73 ± 6

27.5 ± 0.5

96 ± 2

S6 (10–20 cm; A)

50 ± 4

77 ± 7

10 ± 2

90 ± 17

10.6 ± 0.2

102 ± 5

S6 (20–30 cm; B)

77 ± 3

70 ± 4

17 ± 1

83 ± 4

14.6 ± 0.2

101 ± 5

S6 (30–40 cm; B)

62 ± 1

70 ± 9

16 ± 1

84 ± 3

13.4 ± 0.2

99 ± 6

S6 (40–50 cm; B)

53 ± 1

76 ± 12

15 ± 1

85 ± 6

11.5 ± 0.3

97 ± 5

S6 (50–60 cm; B)

45 ± 2

72 ± 4

15 ± 1

85 ± 5

± 0.2

97 ± 7

  1. aThe standard deviations provided for the concentrations of Se in the extracts result from the ICP-MS/MS acquisition performed in triplicate.
  2. bThe standard deviations provided for the proportions of Se in the extracts include the standard deviation obtained for the concentrations of Se in the extract (see a) and the one obtained for soil Se concentrations (soils were digested in triplicate).
  3. cThe standard deviations provided for the proportions of Se oxyanions and the Se recovery determined by AEC-ICP-MS/MS include the standard deviation resulting from the analysis by AEC-ICP-MS/MS of each extract in duplicate and the one obtained the Se concentrations in the extracts (see a).
  4. dThe standard deviations provided for the proportions of Se oxyanions and the Se recovery determined by SEC-UV-ICP-MS/MS include the standard deviation resulting from the deconvolution of SEC Se peaks (using the peak analyzer function “Fit peak-pro” of Origin2018 software) and the standard deviation obtained for the Se concentrations in the extracts (see a).
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