{"query":{"parameter":"selenium","place":"MX","medium":null,"statistic":null,"kind":null},"searched":{"places":["MX"],"parameter_keys":["cas:7782-49-2","name:selenium, dissolved","cas:7783-00-8","name:selenium-75","name:selenium, fish egg or ovary tissue","name:selenium, fish muscle tissue","name:selenium, fish whole body tissue","cas:7446-34-6","name:selenium, total","name:selenium - total alert concentration","name:selenium - total guideline","name:selenium v","name:total selenium","name:total selenium [freshwater – for flowing (lotic) waters]","name:total selenium [freshwater – for still/standing (lentic) waters]"],"names_matched":[["selenium","cas:7782-49-2"],["dissolved selenium","name:selenium, dissolved"],["selenious acid as selenium","cas:7783-00-8"],["selenium 75","name:selenium-75"],["selenium dissolved","name:selenium, dissolved"],["selenium fish egg or ovary tissue","name:selenium, fish egg or ovary tissue"],["selenium fish muscle tissue","name:selenium, fish muscle tissue"],["selenium fish whole body tissue","name:selenium, fish whole body tissue"],["selenium monosulfide","cas:7446-34-6"],["selenium sulfide","cas:7446-34-6"],["selenium total","name:selenium, total"],["selenium total alert concentration","name:selenium - total alert concentration"],["selenium total guideline","name:selenium - total guideline"],["selenium v","name:selenium v"],["total selenium","name:selenium, total"],["total selenium","name:total selenium"],["total selenium freshwater for flowing lotic waters","name:total selenium [freshwater – for flowing (lotic) waters]"],["total selenium freshwater for still standing lentic waters","name:total selenium [freshwater – for still/standing (lentic) waters]"],["total selenium marine","name:total selenium"]],"match":"exact+contains","order":"The place's own instruments first, then each place above it, each in its register's order"},"total":4,"offset":0,"returned":4,"next_offset":null,"rows":[{"id":"8d91832735d00fd3","parameter":"Selenio","value":"0.04","value_num":0.04,"unit":"mg/L","direction":"max","kind":"limit","medium":"drinking_water","level":"national","parameter_key":"cas:7782-49-2","place":["MX"],"conditions":["NOTA 1 Los límites permisibles de metales y metaloides se refieren a su concentración total en el agua, la cual incluye los suspendidos y los disueltos."],"cite":{"instrument":"mx_nom127_ssa1_2021","title":"NOM-127-SSA1-2021 — Agua para uso y consumo humano. Límites permisibles de la calidad del agua: Tablas 1 to 14 and Apéndice A Normativo, Tablas A.1 to A.3","issuer":"Secretaría de Salud (Comisión Federal para la Protección contra Riesgos Sanitarios), Estados Unidos Mexicanos","edition":"DOF 02/05/2022 (in force 360 natural days from the day after publication — 10. 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Cuando el suelo que se presume contaminado tiene una superficie menor o igual a 1 000 m 2 , el responsable procederá a remediar a las concentraciones de referencia totales (CR T ) señaladas en la Tabla 1 o a seguir cualquiera de las metodologías descritas en la presente Norma."],"cite":{"instrument":"mx_nom147_semarnat_ssa1_2004","title":"NOM-147-SEMARNAT/SSA1-2004 — criterios para determinar las concentraciones de remediación de suelos contaminados por arsénico, bario, berilio, cadmio, cromo hexavalente, mercurio, níquel, plata, plomo, selenio, talio y/o vanadio: Tabla 1 (CR T) and Tabla 2 (CR S)","issuer":"Secretaría de Medio Ambiente y Recursos Naturales and Secretaría de Salud, Estados Unidos Mexicanos","edition":"DOF 02/03/2007 (in force sixty natural days after publication — Transitorio Primero)","source_url":"https://dof.gob.mx/nota_detalle_popup.php?codigo=4964569","source_sha256":"90f1db381695867d8327ffa7cf74160031e0caf291db592a01c495816b91373a","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-16","status":"unchanged"},"section":"NOM-147-SEMARNAT/SSA1-2004, Tabla 1 (concentraciones de referencia totales, CR T, por tipo de uso de suelo)","page":null,"quote":"Selenio 390 5 100"}},{"id":"2d16c376ad5a6336","parameter":"Selenio","value":"0,100","value_num":0.1,"unit":"mg/L","direction":"max","kind":"guideline","medium":"leachate","level":"national","parameter_key":"cas:7782-49-2","place":["MX"],"conditions":["4) Remediar hasta las concentraciones de referencia de la fracción soluble establecidas en la Tabla 2 más la fracción soluble de la muestra de fondo. 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