Table 1 Total IN concentration and decreased proportion of IN in crude rainwater under filtration treatment at −6 °C, −8 °C, and −10 °C.
Sample | Onset freezing temperature (°C) | Onset freezing temperature after filtration treatment (°C) | Decrease of onset freezing temperature by filtration treatment (°C) | IN mL−1 [total (% filtration -sensitive)] | ||
|---|---|---|---|---|---|---|
Temperature (°C) | ||||||
−6 | −8 | −10 | ||||
2011-08 | −3.2 | −5.8 | 2.6 | 11 (92) | 66 (43) | 202 (30) |
2012-05 | −5.0 | −5.4 | 0.4 | 26 (100) | 256 (85) | 385 (63) |
2012-06 | −5.2 | −5.8 | 0.6 | 5 (55) | 44 (50) | 147 (31) |
2012-07 | −3.6 | −6.2 | 2.6 | 18 (100) | 71 (85) | 161 (58) |
2012-08 | −5.0 | −7.0 | 2.0 | 16 (100) | 151 (95) | 436 (89) |
2013-05 | −3.6 | −3.8 | 0.2 | 32 (33) | 143 (33) | 237 (13) |
2013-06 | −4.2 | −4.8 | 0.6 | 13 (97) | 85 (85) | 190 (66) |
2013-07 | −3.6 | −4.4 | 0.8 | 26 (18) | 109 (7) | 184 (2) |
2013-08 | −2.8 | −3.4 | 0.6 | 52 (1) | 155 (18) | 252 (12) |
PS | −3 | −15.6 | 12.6 | 326 (100) | ||
