Table 2 SEC recoveries for selenium (Se), sulfur (S), copper (Cu), zinc (Zn), iron (Fe), arsenic (As), and lead (Pb) in NaOH extracts from Kohala topsoils (n = 6), and proportions of these elements in the <20 nm size fraction of ultrapure water and NaOH extracts from Kohala topsoils (n = 6)

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

Soil

Se

S

Cu

Zn

Fe

As

Pb

SEC recoveries in NaOH extracts (% of total extracted element)a

S1 (0–10 cm; A)

100 ± 11

109 ± 5

98 ± 2

89 ± 6

33 ± 1

85 ± 4

17 ± 2

S2 (0–10 cm; A)

102 ± 8

104 ± 4

109 ± 2

104 ± 18

60 ± 2

84 ± 5

56 ± 4

S3 (0–10 cm; A)

99 ± 16

108 ± 5

79 ± 1

88 ± 2

81 ± 1

85 ± 13

52 ± 2

S4 (0–10 cm; A)

102 ± 6

106 ± 7

108 ± 5

108 ± 3

75 ± 2

83 ± 6

55 ± 2

S5 (0–10 cm; A)

92 ± 9

105 ± 4

105 ± 1

94 ± 6

98 ± 11

81 ± 1

52 ± 1

S6 (0–10 cm; A)

91 ± 2

97 ± 2

102 ± 6

110 ± 5

81 ± 1

83 ± 6

54 ± 1

Proportions of elements found in the <20 nm size fraction of NaOH extracts (in % of total extracted element)b

S1 (0–10 cm; A)

100 ± 4

110 ± 4

98 ± 1

71 ± 3

2.09 ± 0.04

75 ± 2

22 ± 1

S2 (0–10 cm; A)

91 ± 4

110 ± 2

100 ± 1

103 ± 13

20.6 ± 0.3

88 ± 1

40 ± 1

S3 (0–10 cm; A)

101 ± 4

103 ± 2

99 ± 1

35 ± 3

24 ± 1

83 ± 5

26 ± 1

S4 (0–10 cm; A)

93 ± 3

109 ± 5

100 ± 1

44 ± 3

19.6 ± 0.1

76 ± 1

28 ± 1

S5 (0–10 cm; A)

96 ± 2

93 ± 1

83 ± 1

31 ± 1

5.2 ± 0.1

89 ± 1

4.6 ± 0.1

S6 (0–10 cm; A)

99 ± 1

102 ± 1

102 ± 3

98 ± 1

99 ± 2

93 ± 4

58 ± 1

Proportions of elements found in the <20 nm size fraction of water extracts (in % of total extracted element)b

S1 (0–10 cm; A)

69 ± 1

99 ± 3

47 ± 1

1.13 ± 0.02

0.08 ± 0.02

37 ± 2

1.3 ± 0.1

S2 (0–10 cm; A)

66 ± 4

97 ± 2

67 ± 1

3.3 ± 0.5

0.60 ± 0.01

53 ± 1

2.8 ± 0.1

S3 (0–10 cm; A)

95 ± 2

97 ± 1

82 ± 1

7.9 ± 0.3

1.47 ± 0.02

53 ± 3

2.0 ± 0.1

S4 (0–10 cm; A)

95 ± 1

95.3 ± 0.3

76 ± 1

12 ± 1

0.85 ± 0.01

34 ± 2

1.65 ± 0.04

S5 (0–10 cm; A)

99 ± 3

100 ± 6

98 ± 2

111 ± 1

19.4 ± 0.4

78 ± 6

9.6 ± 0.4

S6 (0–10 cm; A)

100 ± 2

94 ± 1

101 ± 2

114 ± 8

56 ± 1

88 ± 5

39 ± 1

  1. aThe SEC recoveries presented here were determined for each element by summing-up the concentrations measured by ICP-MS/MS in SEC fractions collected using an ISCO Foxy R R1 TELEDYNE fraction collector (with which maximal four fractions could be collected). For each element, the given standard deviation includes the standard deviations of the element concentration in each collected fractions and the standard deviation of the total element concentration in the extracts (with ICP-MS/MS acquisition being done in triplicate for all elements, fractions and soil extracts).
  2. bThe proportions of elements found in the size fraction <20 nm were determined after quantifying the elements in filtrates of NaOH and water extracts filtered at 20 nm, and are expressed in % of the element concentration in the NaOH and water extracts filtrated at 0.45 µm that are used for SEC-UV-ICP-MS/MS analysis. The standard deviations include the standard deviation obtained for the total elements concentrations in both the extracts filtered at 20  nm and at 0.45 µm (with ICP-MS/MS acquisition being done in triplicate for all elements and extract filtrates).
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