{"query":{"parameter":"ph","place":"MX","medium":null,"statistic":null,"kind":null},"searched":{"places":["MX"],"parameter_keys":["name:ph","cas:68953-84-4","cas:7429-90-5","cas:7439-97-6","cas:56-38-2","name:ph change","name:ph-wert","cas:68951-93-9","cas:68952-93-2","cas:68957-04-0","cas:68037-81-0","cas:63148-58-3"],"names_matched":[["ph","name:ph"],["1 4 benzenediamine n n mixed ph and tolyl derivs","cas:68953-84-4"],["aluminum dissolved ph 6 5 9 0 only","cas:7429-90-5"],["aluminum dissolved ph 6 5 to 9 0 only","cas:7429-90-5"],["mercury ph 4 9","cas:7439-97-6"],["mercury ph 6 8","cas:7439-97-6"],["parathion pentachlorophenol e 1 005 ph 4 869","cas:56-38-2"],["ph change","name:ph change"],["ph change ph","name:ph change"],["ph wert","name:ph-wert"],["polysiloxanes di me di ph hydroxy terminated","cas:68951-93-9"],["siloxanes and silicones di me di ph hydroxy terminated","cas:68951-93-9"],["siloxanes and silicones di me me methoxy methoxy ph polymers with me ph silsesquioxanes","cas:68952-93-2"],["siloxanes and silicones di me methoxy ph polymers with ph silsesquioxanes methoxy terminated","cas:68957-04-0"],["siloxanes and silicones di me methoxy ph polymers with ph silsesquioxanes methoxy terminateda","cas:68957-04-0"],["siloxanes and silicones di ph me ph polymers with me ph silsesquioxanes","cas:68037-81-0"],["siloxanes and silicones me ph","cas:63148-58-3"]],"match":"exact+contains","order":"The place's own instruments first, then each place above it, each in its register's order","not_sent":{"rows":22,"names":["Mercurio","Aluminio"],"says":"22 rows share a parameter key with a longer name holding \"ph\" but are printed under names without these words (that key is wider than the name), or keyed to a CAS number \"ph\" does not name (another substance, whatever words its name holds): not sent. Ask for one by its name or CAS number."}},"total":2,"offset":0,"returned":2,"next_offset":null,"rows":[{"id":"6cc7d7c0bf284e21","parameter":"pH (UpH)","value":"6-9","range":[6,9],"unit":"UpH","direction":"range","kind":"limit","medium":"water_discharge","level":"national","route":"direct","parameter_key":"name:ph","place":["MX"],"conditions":["route is direct"],"cite":{"instrument":"mx_nom001_semarnat_2021","title":"NOM-001-SEMARNAT-2021 — límites permisibles de contaminantes en las descargas de aguas residuales en cuerpos receptores propiedad de la nación: Tabla 1 (contaminantes básicos) and Tabla 2 (metales y cianuros)","issuer":"Secretaría de Medio Ambiente y Recursos Naturales (SEMARNAT), Estados Unidos Mexicanos","edition":"DOF 11/03/2022 (in force 365 days after publication; Tablas 1 and 2 from 3 April 2023; true colour and acute toxicity from the fourth year after publication — Transitorios Primero to Tercero)","source_url":"https://dof.gob.mx/nota_detalle.php?codigo=5645374&fecha=11/03/2022","source_sha256":"0e4017b05758d4a0a24cb7376ac9abee09f0ab5d67974a4bb3b47c37c022807f","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-20","status":"changed","changed_on":"2026-10-17","says":"Source changed on or before 2026-10-17, not yet re-read: these rows are as read from DOF 11/03/2022 (in force 365 days after publication; Tablas 1 and 2 from 3 April 2023; true colour and acute toxicity from the fourth year after publication — Transitorios Primero to Tercero)."},"section":"NOM-001-SEMARNAT-2021, Tabla 1 (límites permisibles de contaminantes básicos)","page":null,"quote":"pH (UpH) 6-9"}},{"id":"5181439b8e9035aa","parameter":"pH","value":"6.5 a 8.5","range":[6.5,8.5],"unit":"Unidades de pH","direction":"range","kind":"limit","medium":"drinking_water","level":"national","parameter_key":"name:ph","place":["MX"],"conditions":[],"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. Vigencia; turbidity 3.0 UNT from the second year after entry into force — Tabla 1 note a; fluoride 1.0 mg/L, arsenic 0.01 mg/L and cadmium 0.003 mg/L one, three or six years after entry into force by locality size — Tablas 3 and 5; repeals the 2000 modification of NOM-127-SSA1-1994 — Transitorio Único)","source_url":"https://dof.gob.mx/nota_detalle.php?codigo=5650705&fecha=02/05/2022","source_sha256":"ccafe3317244274e237d8bfc92051f8396f8d3342782d37d7b4e954099889b46","fetched_at":"2026-10-15","source_status":{"checked":"2026-10-16","status":"not verified"},"section":"NOM-127-SSA1-2021, Tabla 1 (especificaciones sanitarias físicas)","page":null,"quote":"pH 6.5 a 8.5 Unidades de pH"}}],"next":[{"tool":"check_values","says":"Has your user measured this? check_values sets each of their results beside every row held here, with a verdict and the row's cite.","arguments":{"place":"MX"},"needs":{"rows":"Your user's measured results, as their table prints them: [{parameter: \"ph\", value, unit}, ...], any other parameters too."},"post":"/api/v1/check","url":"https://passage-data.com/api/v1/check","page":"https://passage-data.com/limits/MX/ph#check"},{"tool":"read_certificate","says":"Has your user a laboratory certificate? read_certificate reads every row it prints, each with its page, and checks them against these limits.","arguments":{"place":"MX"},"needs":{"content_base64":"The laboratory's certificate (PDF) or its XLSX, XLS or CSV export, as base64; or file_url, a public https address of it."},"post":"/api/v1/certificate","url":"https://passage-data.com/api/v1/certificate","page":"https://passage-data.com/limits/MX/ph#check"}]}