Table 3 Distribution of compounds identified from the HPLC relative area (DAD, 290 nm): the effects of storage period and drying temperature.
From: Spontaneous degradation of methylene blue adsorbed on magnetic biochars
Retention time [min] | 4.9 | 6.1 | 7.0 | 7.3 | 7.6 | 7.8 | 7.9 |
|---|---|---|---|---|---|---|---|
Monoisotopic mass (m/z ion) | no MS | 228.059 | 229.044 | 243.060 | 256.090 | 257.075 | 284.122 |
signal | 242.075 | 256.091 | 270.106 | ||||
Distribution [%] | |||||||
MWchar-Mag | |||||||
Effect of storage period (drying at 80 °C) | |||||||
1 day storage | 0.0 | 2.3 | 3.2 | 7.8 | 4.5 | 29.7 | 52.5 |
7 days storage | 0.4 | 4.0 | 5.2 | 10.5 | 7.3 | 33.3 | 39.4 |
1 month storage | 0.9 | 7.7 | 13.6 | 19.2 | 15.4 | 27.3 | 15.9 |
6 months storage | 3.5 | 28.3 | 29.1 | 13.1 | 13.1 | 11.1 | 1.8 |
Effect of drying temperature (1 day storage) | |||||||
RT | 0.3 | 2.3 | 1.8 | 4.7 | 1.3 | 15.5 | 74.1 |
50 °C | 0.3 | 3.1 | 2.4 | 6.1 | 2.4 | 19.5 | 66.3 |
60 °C | 0.0 | 2.2 | 2.8 | 5.6 | 3.9 | 24.1 | 61.5 |
70 °C | 0.5 | 3.7 | 2.9 | 6.8 | 2.7 | 20.9 | 62.6 |
80 °C | 0.0 | 2.3 | 3.2 | 7.8 | 4.5 | 29.7 | 52.5 |
100 °C | 0.0 | 3.8 | 7.1 | 13.9 | 9.7 | 35.7 | 29.8 |
Effect of drying temperature (7 days storage) | |||||||
RT | 0.7 | 2.6 | 2.6 | 6.2 | 3.4 | 25.3 | 59.3 |
50 °C | 0.6 | 4.1 | 3.9 | 8.0 | 4.9 | 27.5 | 51.1 |
60 °C | 0.3 | 3.0 | 3.8 | 7.4 | 5.8 | 30.9 | 48.7 |
70 °C | 1.1 | 4.6 | 4.3 | 8.5 | 4.8 | 28.2 | 48.5 |
80 °C | 0.4 | 4.0 | 5.2 | 10.5 | 7.3 | 33.3 | 39.4 |
100 °C | 0.3 | 5.0 | 8.7 | 14.7 | 11.1 | 34.9 | 25.2 |
Effect of drying temperature (1 month storage) | |||||||
50 °C | 1.0 | 3.2 | 7.5 | 14.0 | 14.0 | 33.8 | 26.4 |
60 °C | 0.8 | 3.7 | 9.1 | 15.4 | 15.2 | 32.4 | 23.4 |
70 °C | 0.7 | 4.0 | 10.9 | 16.8 | 16.0 | 31.3 | 20.4 |
80 °C | 0.9 | 7.7 | 13.6 | 19.2 | 15.4 | 27.3 | 15.9 |
100 °C | 0.8 | 9.1 | 21.9 | 23.3 | 16.1 | 20.1 | 8.6 |
MWchar | |||||||
Effect of drying temperature (1 day storage) | |||||||
RT | 0.0 | 0.4 | 1.2 | 3.0 | 2.1 | 22.2 | 71.1 |
50 °C | 0.0 | 0.3 | 1.1 | 2.6 | 2.2 | 24.0 | 69.8 |
60 °C | 0.0 | 0.7 | 2.1 | 4.3 | 3.3 | 28.5 | 61.1 |
70 °C | 0.0 | 0.7 | 2.4 | 6.0 | 4.4 | 32.3 | 54.3 |
80 °C | 0.0 | 1.0 | 3.6 | 9.1 | 6.0 | 37.1 | 43.2 |
100 °C | 0.0 | 1.0 | 3.9 | 8.2 | 7.1 | 38.9 | 41.0 |
Effect of drying temperature (7 days storage) | |||||||
RT | 0.0 | 0.7 | 2.4 | 5.7 | 4.1 | 31.0 | 56.3 |
50 °C | 0.0 | 0.9 | 2.8 | 5.3 | 5.6 | 33.6 | 51.9 |
60 °C | 0.4 | 1.4 | 3.9 | 7.6 | 6.2 | 34.5 | 46.0 |
70 °C | 0.4 | 1.6 | 4.5 | 8.9 | 6.3 | 35.6 | 42.8 |
80 °C | 0.0 | 2.8 | 5.7 | 11.7 | 7.4 | 35.8 | 36.7 |
100 °C | 0.0 | 3.0 | 5.8 | 9.6 | 8.0 | 37.6 | 36.1 |
Zeolite | |||||||
Effect of drying temperature (1 day storage) | |||||||
RT | 0.0 | 0.0 | 0.1 | 0.5 | 1.1 | 14.0 | 84.3 |
50 °C | 0.0 | 0.0 | 0.2 | 0.5 | 1.3 | 14.8 | 83.3 |
80 °C | 0.0 | 0.0 | 0.2 | 1.2 | 1.6 | 18.5 | 78.6 |
Effect of drying temperature (7 days storage) | |||||||
RT | 0.0 | 0.0 | 0.1 | 0.5 | 1.0 | 15.4 | 83.0 |
50 °C | 0.0 | 0.0 | 0.2 | 0.8 | 1.4 | 18.5 | 79.2 |
80 °C | 0.0 | 0.0 | 0.4 | 1.5 | 2.0 | 20.6 | 75.5 |
