Ash property

Weathered ash

Fresh ash

Water content (g∙g⁻¹)

0.36 (<0.01)

<0.01 (<0.01)^***

Organic matter (%)

6.40 (0.02)

0.39 (<0.01)^***

Electrical conductivity (µS∙cm⁻¹)

810 (8.6)

1682 (5.4)^***

pH

11.2 (0.01)

11.6 (0.01)^***

Antimony (mg∙kg⁻¹)

<0.25^a

<0.25^a

Arsenic (mg∙kg⁻¹)

5.82 (0.1)

6.93 (0.3)

Barium (mg∙kg⁻¹)

209 (5.8)

405 (77)

Beryllium (mg∙kg⁻¹)

2.41 (<0.01)

2.66 (<0.01)^*

Cadmium (mg∙kg⁻¹)

1.02 (0.01)

0.88 (<0.01)^**

Chromium (mg∙kg⁻¹)

51.97 (0.5)

49.23 (0.1)^*

Lead (mg∙kg⁻¹)

26.30 (0.2)

23.97 (0.1)^**

Mercury (mg∙kg⁻¹)

0.01 (<0.01)

<0.01^a***

Nickel (mg∙kg⁻¹)

37.83 (0.4)

38.83 (0.3)

Selenium (mg∙kg⁻¹)

3.81 (0.1)

4.21 (0.1)

Selenite (mg∙kg⁻¹)

0.70 (0.01)

3.85 (0.3)^***

Selenate (mg∙kg⁻¹)

0.67 (0.01)

0.48 (0.01)^***

Silver (mg∙kg⁻¹)

<0.05^a

<0.05^a

Vanadium (mg∙kg⁻¹)

193.7 (1.9)

173.3 (1.2)^***

Silica (%)

32.04 (0.3)

34.92 (0.2)^**

Aluminum oxide (%)

21.55 (0.1)

21.69 (0.1)

Ferric oxide (%)

5.20 (0.05)

5.55 (0.03)^**

Sulfur trioxide (%)

1.53 (0.03)

1.39 (0.02)^*

Calcium oxide (%)

26.3 (0.2)

26.8 (0.2)

Magnesium oxide (%)

5.14 (0.05)

5.69 (0.03)^***

Sodium oxide (%)

1.73 (0.02)

1.87 (<0.01)^***

Potassium oxide (%)

0.39 (0.1)

0.41 (0.01)