Table 3 Water leaching test results for solid samples from the Salt Lake Mahai (unit: µg/g).

Mud

(n = 13)

Average ± Std. dev

5.2 ± 3.55

30,923.55 ± 13,311.65

2,878.51 ± 696.42

5,534.42 ± 4,653.35

10,064.4 ± 16,676.51

Minimum

1.7

10,706

1,433

1,400.8

1,845.1

Maximum

14.4

61,640

4,167.1

15,865

57,145

Gypsum-bearing mud

(n = 3)

Average ± Std. dev

4.3 ± 0.96

30,593.37 ± 20,248.85

2,627.93 ± 119.85

4,672.03 ± 2,277.17

5,482.87 ± 5,574.85

Minimum

3.6

12,650.1

2,490

3,080.7

1,451.4

Maximum

5.4

52,547.5

2,706.6

7,280.5

11,844.8

Gypsum and

halite-bearing mud

(n = 2)

Average

10.8

25,914.7

2,544.35

11,385.6

48,656.25

Minimum

8.8

19,201.4

1,940

8,601.2

41,932.5

Maximum

12.8

32,628

3,148.7

14,170

55,380

Clay

(n = 2)

Average

4.9

41,322.5

3,601.95

5,259.85

14,536.55

Minimum

3.3

35,702.5

2,413.2

2,932.9

7,034.9

Maximum

6.5

46,942.5

4,790.7

7,586.8

22,038.2

Gypsum-bearing clay

(n = 14)

Average ± Std. dev

5.61 ± 1.88

46,229.65 ± 37,213.04

2,620.74 ± 1,025.89

7,291 ± 2,804.74

21,212.94 ± 18,070.77

Minimum

3

9,863.5

897.2

2,361.7

661

Maximum

9.2

156,912.5

4,305.6

12,790

57,920

Gypsum and

halite-bearing clay

(n = 3)

Average ± Std. dev

3.57 ± 1.72

66,413.33 ± 36,428.93

2,500.77 ± 901.39

3,811.63 ± 1,705.50

31,951.4 ± 20,588.78

Minimum

2.2

25,157.5

1,660

2,006.3

17,757.9

Maximum

5.5

94,150

3,452.5

5,395.7

55,565

Halite-bearing clay

(n = 6)

Average ± Std. dev

3.73 ± 1.34

52,336.05 ± 39,137.19

2,306.47 ± 453.37

5,729.15 ± 3,752.66

17,710.8 ± 12,735.73

Minimum

2.5

17,011.3

1,719.7

2,951

1,490.1

Maximum

5.7

121,515

2,846

11,421.2

39,937.5

Silt and

halite-bearing clay

(n = 5)

Average ± Std. dev

7.8 ± 4.72

91,589.38 ± 143,038.83

2,586.26 ± 922.81

11,219.82 ± 8,391.69

18,811.82 ± 14,201.01

Minimum

1.1

8,136.9

1,096.2

1,531.8

6,844.5

Maximum

12.6

344,445

3,605

22,057.5

40,312.5

Silty clay (n = 1)

–

6

39,492.5

2,782

8,860.6

28,182.5

Silt-bearing halite

(n = 21)

Average ± Std. dev

3.68 ± 3.76

307,868.69 ± 77,409.78

3,405.02 ± 5,526.73

4,803.35 ± 5,297.02

13,122.08 ± 10,375.29

Minimum

0.9

74,195

614.2

888.4

2,306.1

Maximum

17.4

376,932.5

23,347.5

24,387.5

34,482.5

Silty halite

(n = 5)

Average ± Std. dev

2.9 ± 2.41

270,810.5 ± 103,039.97

3,696.08 ± 4,171.28

2,324.18 ± 1,554.09

14,249.06 ± 8,111.85

Minimum

0.4

143,642.5

361.3

460.1

5,055

Maximum

6.2

365,260

8,462.4

4,670.1

25,462.5

Mud-bearing halite

(n = 1)

–

0.7

320,460

1,124.2

559.9

47,177.5

Halite-bearing

silt (n = 3)

Average ± Std. dev

10.67 ± 11.74

131,990 ± 83,808.46

1,518 ± 159.48

15,270.47 ± 15,127.14

19,266.57 ± 4,952.80

Minimum

3.2

73,605

1,341

3,642

13,638.9

Maximum

24.2

228,020

1,650.5

32,372.5

22,962

Halite-bearing

fine sand

(n = 2)

Average

11.2

87,768.75

3,317.95

14,584.1

22,597.05

Minimum

7.6

81,717.5

1,577.5

9,125.7

17,089.1

Maximum

14.8

93,820

5,058.4

20,042.5

28,105

Clay-bearing silt

(n = 5)

Average ± Std. dev

4.23 ± 2.87

147,243.13 ± 124,046.85

1,536.08 ± 1,254.11

4,479.65 ± 3,053.64

14,850.35 ± 7,194.29

Minimum

0.7

36,797.5

417

622.6

6,941.9

Maximum

8.4

348,132.5

2,783

6,879.1

23,075.9