Physicochemical parameters | Day 6 | Day 12 | Day 21 | Day 30 | ||||
---|---|---|---|---|---|---|---|---|
r | p | r | p | r | p | r | p | |
pH | 0.492 | 0.028 | − 0.180 | 0.449 | − 0.616 | 0.004 | − 0.814 | 0.000 |
ORP | − 0.003 | 0.989 | − 0.075 | 0.755 | 0.274 | 0.242 | 0.410 | 0.073 |
Fe2+ | 0.455 | 0.044 | − 0.035 | 0.883 | − 0.250 | 0.287 | − 0.216 | 0.360 |
Fe3+ | − 0.059 | 0.804 | 0.208 | 0.380 | 0.543 | 0.014 | 0.744 | 0.000 |
SO4 2− | 0.407 | 0.075 | 0.592 | 0.006 | 0.745 | 0.000 | 0.786 | 0.000 |
Zn2+ | 0.397 | 0.083 | 0.293 | 0.211 | 0.145 | 0.541 | 0.068 | 0.777 |
Cu2+ | − 0.130 | 0.586 | − 0.122 | 0.610 | − 0.094 | 0.694 | − 0.088 | 0.712 |