## 3 Results and Discussion
### Method Validations
#### 3.3.2 Recovery Rates  
Analytical recovery is a test that measures an analysis error related to the analysis process within the preparation of a sample and extraction of an analyte from the sample before quantitation. The results of the GC-MS/MS and LC-MS/MS analyses of the soil are reported in Tables 5, S5, 6 and S6, and the recovery rates had values ranging from 70 to 120% and <20% RSD, which are effective recovery rates. In the recovery test in the soil using GC-MS/MS, all pesticides exceptametoctradin out of 123 pesticides had three repeated tests at the two spiked levels of 10 and 50 \(\upmu\) kg\({}^{-1}\), and all recovery rates for pesticides satisfied the effective recovery range of 70-120% (Tables 5 and S5). In addition, the coefficient of variation (% RSD) was confirmed to be less than 20% for all pesticides (Tables 5 and S5). \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**No.** & **Pesticides** & **Limit of Detection** & **Limit of Quantification** & **Linearity (\(r^{2}\))** \\ \hline
27 & Chlorsoulfuron & 3 & 10 & 0.9998 \\
28 & Chromafenozide & 3 & 10 & 0.9968 \\
29 & Clethodim & 3 & 10 & 0.9989 \\
30 & Clofentezine & 3 & 10 & 0.9961 \\
31 & Clomazone & 3 & 10 & 0.9941 \\
32 & Clothinidin & 3 & 10 & 0.9999 \\
33 & Cyazofamid & 3 & 10 & 0.9938 \\
34 & Cyclosulfamuron & 3 & 10 & 0.9959 \\
35 & Cyflufenamid & 3 & 10 & 0.9953 \\
36 & Cyhalofop-butyl & 3 & 10 & 0.9915 \\
37 & Cymoxanil & 3 & 10 & 0.9924 \\
38 & Cyprocanazole(I) & 3 & 10 & 0.9937 \\
39 & Cyprocanazole(II) & 3 & 10 & 0.9923 \\
40 & Daimuron & 3 & 10 & 0.9922 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: _Cont._ \begin{table}
\begin{tabular}{c c c c c c} \hline \hline  & & \multicolumn{4}{c}{**Soil**} \\ \cline{3-5}
**No.** & **Pesticides** & \multicolumn{2}{c}{**Low (10 \(\upmu\) kg\({}^{-1}\))**} & \multicolumn{2}{c}{**High (50 \(\upmu\) kg\({}^{-1}\))**} \\ \cline{3-5}  & & **Rec.** & **RSD** & **Rec.** & **RSD** \\ \hline
1 & Acrinathrin & 106.58 & 10.9 & 94.65 & 3.7 \\
2 & Alachlor & 113.99 & 9.8 & 96.30 & 1.9 \\
3 & Aldrin & 97.53 & 2.2 & 99.01 & 4.3 \\
4 & Ametoctradin & - & - & - & - \\
5 & Anilofos & 105.35 & 2.9 & 96.05 & 2.5 \\
6 & Azaconazole & 98.77 & 2.2 & 95.97 & 1.0 \\
7 & Benfuresate & 98.77 & 6.6 & 95.14 & 7.0 \\
8 & BHC(Lindane)-gamma & 89.30 & 9.2 & 99.92 & 5.6 \\
9 & BHC-alpha & 93.00 & 8.0 & 100.41 & 3.6 \\
10 & BHC-beta & 104.12 & 6.1 & 98.60 & 3.0 \\
11 & BHC-delta & 88.07 & 5.7 & 98.44 & 4.1 \\
12 & Bifenox & 110.70 & 3.4 & 89.14 & 0.7 \\
13 & Bifenthrin & 110.70 & 1.7 & 95.64 & 1.4 \\
14 & Bromobutide & 100.82 & 4.3 & 95.89 & 2.6 \\
15 & Bromopropypylate & 108.64 & 1.1 & 95.31 & 1.2 \\
16 & Butachlor & 104.94 & 7.3 & 100.49 & 5.9 \\
17 & Butafenacil & 111.11 & 2.2 & 95.72 & 1.4 \\
18 & Carbophenothion & 104.94 & 4.1 & 96.13 & 3.4 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Recoveries of the first 40 pesticides in the untreated soil using GC-MS/MS (\(n=3\)). Recoveries of the other 83 pesticides are listed in Table S5. In the recovery test of the soil using LC-MS/MS, all pesticides except for gibberellic acid out of 219 pesticides had three repeated tests at the two spiked levels of 10 and 50 \(\upmu\) kg\({}^{-1}\), and all recovery rates for pesticides satisfied the effective recovery range of 70-120% (Tables 6 and S6). In addition, the coefficient of variation (% RSD) was confirmed to be less than 20% for all pesticides (Tables 6 and S6).