1 Introduction
2 Materials and methods
2.1 Wood samples
2.2 Sample preparation
2.3 Analytical methods
2.4 Series of experiments
3 Results and discussion
3.1 Residual contents of propiconazole, tebuconazole and permethrin in aged wood samples
Sample | Analytical procedure | Solvent for calibration solutions | Propiconazole | Tebuconazole | Permethrin | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|
n | Mean | SD | n | Mean | SD | n | Mean | SD | |||
mg kg−1 | mg kg−1(%) | mg kg−1 | mg kg−1(%) | mg kg−1 | mg kg−1(%) | ||||||
A | HPLC–UV (Series 1) | Not specified | 8 | 125 | 28 (22) | 8 | 114 | 29 (25) | |||
B | Not specified | 8 | 128 | 32 (25) | 8 | 108 | 27 (25) | ||||
C | Not specified | 8 | 75 | 24 (32) | 8 | 67 | 26 (39) | 7 | 147 | 12 (8) | |
C | HPLC–UV (Series 2) | Methanol | 9 | 65 | 8 (12) | 6 | 58 | 7 (13) | 8 | 130 | 14 (11) |
Pine extract A | 5 | 66 | 8 (12) | 2 | 59 | 5 | 131 | 4 (3) | |||
Pine extract B | 8 | 71 | 11 (16) | 6 | 58 | 9 (15) | 8 | 130 | 5 (4) | ||
A | LC–MS (Series 1) | Methanol | 1 | 141 | 1 | 120 | |||||
B | Methanol | 1 | 140 | 1 | 117* | ||||||
C | Methanol | 1 | 86 | 1 | 69 |
Sample | Analytical procedure | Propiconazole | Tebuconazole | Permethrin | |||||
---|---|---|---|---|---|---|---|---|---|
n | Mean | SD | n | Mean | n | Mean | SD | ||
mg kg−1 | mg kg−1(%) | mg kg−1 | mg kg−1 | mg kg−1(%) | |||||
A | GC-ECD | 3 | 124 | 3 (2) | 1 | 132 | |||
B | 3 | 109* | 13 (12) | 1 | 108 | ||||
C | 3 | 69 | 5 (7) | 1 | 58 | 3 | 161 | 14 (9) | |
A | GC–MS | 2 | 142 | 2 | 142 | ||||
B | 2 | 133* | 2 | 119* | |||||
C | 2 | 78 | 2 | 74 | |||||
A | GC-FID | 1 | 115 | ||||||
B | 1 | 85* | |||||||
C | 1 | 64 |
3.2 Recovery rates of applied methods
Experiment | Sample | Method | Calculated original content | Analyzed content | ||||
---|---|---|---|---|---|---|---|---|
Propiconazole | Tebuconazole | Permethrin | Propiconazole | Tebuconazole | Permethrin | |||
mg kg−1 | mg kg−1 | mg kg−1 | mg kg−1 | mg kg−1 | mg kg−1 | |||
Series 1 | A | GC and HPLC | 160 | 160 | 124–142 | 114–142 | ||
B | GC and HPLC | 160 | 160 | 109–133 | 85–119 | |||
C | GC and HPLC | 80 | 80 | 140 | 69–86 | 58–74 | 147–167 | |
Series 2 | C | HPLC–UV | 65–71 | 58–59 | 130–131 | |||
RV 2001 | Doped spruce | GC and HPLC (n = 7) | 58 | 58 ± 11 | ||||
RV 2006 | Doped spruce | GC (n = 11) | 415 | 418 ± 17 | ||||
RA 2017 | GC-ECD | 371* | ||||||
GC–MS | 376* | |||||||
LC–MS | 357* | |||||||
RV 2004 | Doped pine | GC and HPLC (n = 13) | 196 | 188 ± 27 | ||||
RA 2017 | GC-FID | 113* | ||||||
GC–MS | 138* | |||||||
HPLC–UV | 134** | |||||||
LC–MS | 126* | |||||||
RV2005 | Doped spruce | HPLC–UV (n = 5) | 221 | 215 ± 12 | ||||
GC (n = 11) | 228 ± 27 | |||||||
RA 2017 | GC-ECD | 209* | ||||||
GC–MS | 221* | |||||||
HPLC–UV | 205* |