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Recovery [%] of spiked total VFAs (calculated from the sum of masses of formate, acetate, propionate, and butyrate) after addition of preservation agents or deep freezing
| day | CuCl2‐3Cu(OH)2 | Commercial kit | CuCl2 | −20°C |
|---|---|---|---|---|
| 1 | 101 | 60.8 | 95.1 | nd |
| 3 | 102 | 7.51 | 95.5 | nd |
| 5 | 69.7 | nd | 95.8 | 92.7 |
nd: not determined.
