Calidad del agua en estaciones seleccionadas del Río Lerma | ||||||||||||||||||||
Concepto | Unidades | 1990 | 1995 | 2000 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | |
Estación de medición | ||||||||||||||||||||
Nombre | Puente | Puente | Río Lerma en Maltaraña | |||||||||||||||||
Briseñas | Briseñas | |||||||||||||||||||
km | 22 | 22 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | ||
Número | 3 | 3 | 3 | 8 | 10 | 10 | 4 | 2 | 8 | 7 | 4 | 5 | 6 | 6 | 6 | 6 | 6 | 2 | ||
Parámetros (mediana anual) | ||||||||||||||||||||
Temperatura | °C | 22.0 | 24 | 20 | 23.8 | 24.15 | 24.95 | 25.2 | 25.75 | 27 | 25.5 | 22.5 | 22.9 | 24.15 | 24.7 | 24.35 | 23.3 | 24.45 | 24.6 | |
Acidez | pH | nd | nd | 6.6 | 7.585 | 7.325 | 7.305 | 7 | 6.5 | 7.56 | 8.06 | 7.77 | 7.775 | 8.65 | 7.8 | 8.05 | 8.3 | 8 | 7.895 | |
Oxígeno disuelto | mg O2 / l | 3.4 | 5.7 | 2.2 | 3.8 | 3 | 4.1 | 3.52 | 7.65 | 4.285 | 3.99 | 2.20 | 1.98 | 3.45 | 3.36 | 5.795 | 4.535 | 5.18 | 5.95 | |
Saturación de oxígeno | % | nd | nd | nd | nd | nd | nd | nd | nd | nd | nd | 68.88 | 35.25 | 54.1 | 49.3 | 85.1 | 56.9 | 72.3 | 86.45 | |
DBO (20°C 5d) | mg O2/ l | 17 | 9.08 | 30.0 | 5.7 | 5.2 | 5.25 | 17.05 | 8.06 | 7.835 | 4.87 | 5.91 | 9.985 | 11.45 | 6.62 | 4.025 | 2.885 | 5.565 | 18.35 | |
DQO (K2Cr2O7) | mg O2/ l | 75 | 50 | 63.5 | 47 | 71.5 | 45 | 75.5 | 53.97 | 46.69 | 29.97 | 27.105 | 43.31 | 56.835 | 37.895 | 43.64 | 44.505 | 36.055 | 31.025 | |
Sólidos suspendidos | mg/ l | 28 | 529 | 46 | 52 | 55 | 44 | 74.5 | 22.5 | 40.5 | 44 | 40 | 107.35715 | 69.8 | 223 | 156.665 | 117.535 | 23.5 | 65.12 | |
Sólidos disueltos | mg/ l | 1921 | 88 | 506 | 332 | 370 | 468 | 409.5 | 583.5 | 416.5 | 567 | 501 | 305.92 | 304.32 | 296.32 | 351.04 | 473.92 | 374.4 | 286.08 | |
Nitrógeno total | mg N/ l | nd | nd | nd | nd | nd | nd | nd | nd | 4.55 | 2.455 | 2.7 | 5.2247 | 2.3415 | 3.7960 | 2.7337 | 1.6184 | 1.8897 | 4.7221 | |
Nitratos | mg NO3/ l | 0.1 | 0.83 | 0.6 | 0.04 | 1.225 | 1.155 | 1.735 | <0.25 | 1.955 | 0.25 | 0.284 | 1.9666 | 0.4465 | 1.0505 | 0.3829 | 0.1251 | 0.2023 | 1.4866 | |
Amonio | mg NH4/ l | nd | nd | nd | 0.387 | 1.317 | 0.54 | 1.009 | 2.66 | 1.17 | 0.428 | 0.396 | 0.7296 | 0.2562 | 0.2407 | 0.2638 | 0.2807 | 0.2552 | 1.2320 | |
Fósforo total | mg P/ l | nd | nd | 2.850 | 0.865 | nd | nd | 0.733 | 0.712 | 1.1 | 0.99 | 0.75 | 1.0831 | 0.97 | 1.0733 | 1.0459 | 0.7797 | 0.7705 | 0.8982 | |
Ortofosfatos | mg P/ l | 2.22 | 0.34 | 2.83 | 0.825 | 0.73 | 0.845 | nd | nd | 0.87 | 0.68 | 0.73 | 0.7946 | 0.656 | 0.6444 | 0.6768 | 0.6338 | 0.6637 | 0.7459 | |
Coliformes fecales | NMP/100 ml | nd | 600 | 4600 | nd | nd | nd | nd | 2001.5 | 840 | 430 | 2365 | 20762.5 | 17000 | 11481.5 | 24196 | 20762.5 | 3612 | 70919.5 | |
Arsénico total | mg As/ l | nd | nd | nd | nd | nd | nd | nd | 0.0105 | <0.005 | 0.0086 | <0.00365 | <0.00139 | <0.00139 | <0.00139 | <0.00139 | 0.0085475 | <0.00139 | <0.00139 | |
Cadmio total | mg Cd/ l | nd | nd | nd | nd | nd | nd | nd | nd | <0.001 | <0.00058 | <0.0005 | <0.0002 | <0.0002 | <0.0002 | <0.0002 | <0.0002 | <0.0002 | <0.00023 | |
Cromo total | mg Cr/ l | nd | nd | nd | nd | nd | nd | nd | nd | <0.05 | <0.05 | <0.05 | 0.00855 | 0.00247 | 0.0161 | 0.0083 | 0.00267 | 0.0061 | 0.00935 | |
Cobre total | mg Cu/ l | nd | nd | nd | nd | nd | nd | nd | nd | <0.1 | nd | nd | nd | nd | nd | nd | nd | nd | nd | |
Plomo total | mg Pb/ l | nd | nd | nd | nd | nd | nd | nd | nd | <0.005 | <0.0025 | 0.0027 | <0.00154 | <0.00154 | <0.00154 | <0.00154 | <0.00154 | <0.00154 | <0.00154 | |
Mercurio total | mg Hg/ l | nd | nd | nd | nd | nd | nd | nd | nd | <0.001 | <0.00057 | 0.000339 | 0.0006 | 0.000155 | 0.0000975 | 0.0001075 | 0.000049 | <0.00009 | 0.0001555 | |
Níquel total | mg Ni/ l | nd | nd | nd | nd | nd | nd | nd | nd | <0.1 | <0.1 | <0.1 | 0.00685 | 0.00465 | 0.0119 | 0.00915 | 0.00225 | 0.00225 | 0.0094 | |
Zinc total | mg Zn/ l | nd | nd | nd | nd | nd | nd | nd | nd | nd | 0.0245 | 0.033 | nd | nd | nd | nd | nd | nd | nd | |
Cianuros | mg CN/ l | nd | nd | nd | nd | nd | nd | nd | nd | nd | nd | nd | 0.01 | 0.0025 | 0.0021275 | 0.001137 | <0.001 | <0.001 | 0.00275 | |
Notas: | ||||||||||||||||||||
La fuente reporta los datos con medianas en vez de promedios debido a la alta sensibilidad de los promedios a los valores extremos. | ||||||||||||||||||||
Ubicación geográfica de las estaciones de medición. Puente Briseñas: 20º 17´ 30" lat. N; 102º 32´ 00" long. W; La Palmita Maltaraña, Jalisco: 20° 13' 00'' lat. N; 102° 40' 60'' long. W (esta estación cambió de nombre a Río Lerma en Maltaraña, tal como se presenta al final de la serie). | ||||||||||||||||||||
nd. No disponible | ||||||||||||||||||||
Fuente: | ||||||||||||||||||||
Comisión Nacional del Agua, Gerencia de Calidad del Agua, Junio 2020 |