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This study evaluated a hybrid treatment process combining ultrasonication (US) and electrocoagulation (EC) for the batch removal of arsenic from complex natural water matrices using iron electrodes. Under the investigated conditions simultaneous US\/EC achieved arsenic removal efficiencies exceeding 99.5%, at current densities as low as 10\u2009A\u2009m\n                    <jats:sup>\u22122<\/jats:sup>\n                    . The process remained highly effective when applied to untreated natural waters from Atacama Desert, Chile, containing naturally occurring geogenic arsenic concentrations of 285\u20132965\u2009\u03bcg\u2009L\n                    <jats:sup>\u22121<\/jats:sup>\n                    . R\u00edo Puritama, Socaire, and Camar Alto reached residual arsenic concentrations below the 10\u2009\u03bcg\u2009L\n                    <jats:sup>\u22121<\/jats:sup>\n                    drinking\u2010water guideline within 10\u2009min, whereas Cruce Talabre, with the highest initial arsenic concentration (2965\u2009\u03bcg\u2009L\n                    <jats:sup>\u22121<\/jats:sup>\n                    ), required 60\u2009min to decrease arsenic to 2.33\u2009\u03bcg\u2009L\n                    <jats:sup>\u22121<\/jats:sup>\n                    . Kinetic analysis showed that the pseudo\u2010second\u2010order model provided a better empirical description of the Cruce Talabre data than the pseudo\u2010first\u2010order model; however, because more than 98% of the initial dissolved arsenic had already been removed by the first sampling point at 10\u2009min, the fitted parameters should be regarded as apparent rather than intrinsic kinetic constants. Energy analysis showed that ultrasonication dominated the estimated laboratory\u2010scale energy demand, primarily because the nominal 400\u2009W ultrasonic power was applied to a batch volume of only 0.8\u2009L. Overall, simultaneous US\/EC showed high arsenic removal performance in chemically distinct natural waters, whereas future scale\u2010up should prioritize optimization of ultrasonic energy input.\n                  <\/jats:p>","DOI":"10.1002\/wer.70592","type":"journal-article","created":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T18:05:54Z","timestamp":1790100354000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Arsenic Removal From San Pedro de Atacama's Natural Waters Using a Sono\u2010Electrocoagulation Technique"],"prefix":"10.1002","volume":"98","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7064-9564","authenticated-orcid":false,"given":"Pamela","family":"Lazo","sequence":"first","affiliation":[{"name":"Instituto de Qu\u00edmica, Facultad de Ciencias Universidad de Valpara\u00edso  Valpara\u00edso Chile"},{"name":"Centro de Observaci\u00f3n Marina para Estudios de Riesgos del Ambiente Costero (COSTA\u2010R) Universidad de Valpara\u00edso  Valpara\u00edso Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6123-9360","authenticated-orcid":false,"given":"Andrea","family":"Lazo","sequence":"additional","affiliation":[{"name":"Departamento de Ingenier\u00eda Qu\u00edmica y Ambiental Universidad T\u00e9cnica Federico Santa Mar\u00eda  Valpara\u00edso Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-8942-7783","authenticated-orcid":false,"given":"Alejandro","family":"Zambra","sequence":"additional","affiliation":[{"name":"Departamento de Ingenier\u00eda Qu\u00edmica y Ambiental Universidad T\u00e9cnica Federico Santa Mar\u00eda  Valpara\u00edso Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mar\u00eda Gabriela","family":"Lobos","sequence":"additional","affiliation":[{"name":"Instituto de Qu\u00edmica, Facultad de Ciencias Universidad de Valpara\u00edso  Valpara\u00edso Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pablo","family":"Carmona","sequence":"additional","affiliation":[{"name":"Laboratorio de Qu\u00edmica Anal\u00edtica y Ambiental Universidad de Valpara\u00edso  Valpara\u00edso Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-4295-369X","authenticated-orcid":false,"given":"Arnold","family":"Solano","sequence":"additional","affiliation":[{"name":"Departamento de Ingenier\u00eda Qu\u00edmica y Ambiental Universidad T\u00e9cnica Federico Santa Mar\u00eda  Valpara\u00edso Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-0656-0043","authenticated-orcid":false,"given":"Marcela E.","family":"Hansen","sequence":"additional","affiliation":[{"name":"Departamento de Ingenier\u00eda Qu\u00edmica y Ambiental Universidad T\u00e9cnica Federico Santa Mar\u00eda  Valpara\u00edso Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4761-8700","authenticated-orcid":false,"given":"Henrik K.","family":"Hansen","sequence":"additional","affiliation":[{"name":"Departamento de Ingenier\u00eda Qu\u00edmica y Ambiental Universidad T\u00e9cnica Federico Santa Mar\u00eda  Valpara\u00edso Chile"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,9,22]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/ajpa.23193"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.psep.2025.107536"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.psep.2016.09.023"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jwpe.2025.108637"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1051\/e3sconf\/202015801004"},{"key":"e_1_2_10_7_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.est.0c00012"},{"key":"e_1_2_10_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/aheh.200390025"},{"key":"e_1_2_10_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.seppur.2013.08.011"},{"key":"e_1_2_10_10_1","doi-asserted-by":"publisher","DOI":"10.3390\/w16121684"},{"key":"e_1_2_10_11_1","doi-asserted-by":"publisher","DOI":"10.1007\/s13201\u2010022\u201001660\u20100"},{"key":"e_1_2_10_12_1","doi-asserted-by":"publisher","DOI":"10.1021\/es030309t"},{"key":"e_1_2_10_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0001\u20108686(02)00067\u20102"},{"key":"e_1_2_10_14_1","volume-title":"Standard Methods for the Examination of Water and Wastewater","author":"Eaton A. 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