## 3 Results and Discussion
### Metal Analysis  
Pseudo-total metal concentrations (Table 7) of Pb showed no statistically significant differences (\(p<0.05\)) between dry season and rainy season, both for soil and for sediment. However, a decrease in total Pb concentration in soils during the dry season compared to rainy season was observed. Additionally, there were variations in the pseudo-total concentration of Pb in sediments, with an increase in Pb concentration in sample S1 during the rainy season, probably due to the effect of runoff from mining activity; [PERSON] et al. observed a similar phenomenon in sediments from the area nearest to the mine [13]. Decreased Pb concentration were observed in sample S4 during the rainy season, attributable in part, to the dilution effect of the reservoir. Sample S22 also showed an increase in lead concentration during the rainy season, triple that of the concentration in dry season, it is important to note that this point is within the City of Aguascalientes; thus, the increase is possibly due to surface runoff that includes urban waste generated in the city. However, the Niagara reservoir (S24) showed little variation in concentration between seasons, explained in part by the negligible fluctuation in the volume of water between seasons. The Table 8 shows the pseudo-total concentration order of metal by substrate/season. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Site**} & \multirow{2}{*}{**Substrate**} & \multirow{2}{*}{**Season**} & \multicolumn{2}{c}{**PbTotal**} & \multicolumn{2}{c}{**Leading Test**} & \multicolumn{2}{c}{**SEP Tessier (\%)**} & \multicolumn{2}{c}{**MF**} \\ \cline{5-8}  & & & \multicolumn{1}{c}{\(\begin{bmatrix}\text{mg kg}^{-1}\end{bmatrix}\)} & \multicolumn{1}{c}{\(\begin{bmatrix}\text{mg kg}^{-1}\end{bmatrix}\)} & \multicolumn{1}{c}{\(\begin{bmatrix}\text{mg kg}^{-1}\end{bmatrix}\)} & \multicolumn{1}{c}{\(\begin{bmatrix}\text{mg kg}^{-1}\end{bmatrix}\)} & \multicolumn{1}{c}{\(\begin{bmatrix}\text{mg kg}^{-1}\end{bmatrix}\)} \\ \hline S1 & Soil & Dry & 527.2 & 3.87 & 0.73 & 8.74 & 46.1 \\  & & Rainy & 164.8 & 0.44 & 0.27 & 19.52 & 32.2 \\  & Sediment & Dry & 1892.8 & 5.55 & 0.29 & 20.90 & 395.6 \\  & & Rainy & 4273.3 & 20.24 & 0.46 & 55.75 & 2382.4 \\ \hline S2 & Soil & Dry & 441.6 & 1.24 & 0.28 & 9.89 & 43.7 \\  & & Rainy & 207.4 & 0.49 & 0.24 & 15.28 & 31.7 \\  & Sediment & Dry & 876.1 & 1.80 & 0.21 & 22.11 & 193.7 \\  & & Rainy & 958.0 & 15.18 & 1.58 & 21.24 & 203.5 \\ \hline S4 & Soil & Dry & 244.9 & 1.18 & 0.48 & 19.51 & 47.8 \\  & & Rainy & 106.9 & 0.62 & 0.58 & 33.28 & 35.6 \\  & & & 381.5 & 17.12 & 4.49 & 29.00 & 110.6 \\  & & Rainy & 39.3 & 0.07 & 0.18 & 27.63 & 10.9 \\ \hline S6 & Soil & Dry & 23.0 & 0.46 & 2.00 & 40.77 & 9.4 \\  & & Rainy & 18.7 & 0.50 & 2.67 & 37.71 & 7.1 \\  & & Sediment & Dry & 16.3 & 0.60 & 3.69 & 39.21 & 6.4 \\  & & Rainy & 45.1 & 0.07 & 0.15 & 25.44 & 11.5 \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Metal analyses of samples during dry and rainy seasons and mobility factor. The values obtained in this study were compared with guidelines adopted by Canada [47,48] due to the absence of local reference values. We compared our results with Soil Quality Guidelines (Agricultural = 70 mg kg\({}^{-1}\), Residential = 140 mg kg\({}^{-1}\), Commercial = 260 mg kg\({}^{-1}\) and Industrial = 600 mg kg\({}^{-1}\)) and found that the values of S1 and S4 were up to seven times higher than the Quality Guidelines (QG) for agricultural zone; S2 was three times greater than QG for residential zone; the rest of the sites are below the QG. Similarly, we used the Sediment Quality Guidelines, Threshold Effect Level (TEL) and