{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,26]],"date-time":"2025-10-26T21:18:15Z","timestamp":1761513495612,"version":"build-2065373602"},"reference-count":42,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2014,7,21]],"date-time":"2014-07-21T00:00:00Z","timestamp":1405900800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"funder":[{"name":"High Impact Research Grant","award":["UM.C\/HIR\/MOHE\/ENG\/43."],"award-info":[{"award-number":["UM.C\/HIR\/MOHE\/ENG\/43."]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In this study, a potentiometric sensor composed of palm shell activated carbon modified with trioctylmethylammonium thiosalicylate (TOMATS) was used for the potentiometric determination of mercury ions in water samples. The proposed potentiometric sensor has good operating characteristics towards Hg (II), including a relatively high selectivity; a Nernstian response to Hg (II) ions in a concentration range of 1.0 \u00d7 10\u22129 to 1.0 \u00d7 10\u22122 M, with a detection limit of 1 \u00d7 10\u221210 M and a slope of  44.08 \u00b1 1.0 mV\/decade; and a fast response time (~5 s). No significant changes in electrode potential were observed when the pH was varied over the range of 3\u20139. Additionally, the proposed electrode was characterized by good selectivity towards Hg (II) and no significant interferences from other cationic or anionic species.<\/jats:p>","DOI":"10.3390\/s140713102","type":"journal-article","created":{"date-parts":[[2014,7,21]],"date-time":"2014-07-21T11:43:19Z","timestamp":1405942999000},"page":"13102-13113","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["A New Electrochemical Sensor Based on Task-Specific Ionic Liquids-Modified Palm Shell Activated Carbon for the Determination of Mercury in Water Samples"],"prefix":"10.3390","volume":"14","author":[{"given":"Ahmed","family":"Ismaiel","sequence":"first","affiliation":[{"name":"Chemical Engineering Department, University of Malaya, Kuala Lumpur 50603, Malaysia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mohamed","family":"Aroua","sequence":"additional","affiliation":[{"name":"Chemical Engineering Department, University of Malaya, Kuala Lumpur 50603, Malaysia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rozita","family":"Yusoff","sequence":"additional","affiliation":[{"name":"Chemical Engineering Department, University of Malaya, Kuala Lumpur 50603, Malaysia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2014,7,21]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"475","DOI":"10.1016\/j.jhazmat.2009.01.007","article-title":"Trace mercury determination in drinking and natural water samples by room temperature ionic liquid based-preconcentration and flow injection-cold vapor atomic absorption spectrometry","volume":"167","author":"Martinis","year":"2009","journal-title":"J. Hazard. Mater."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"935","DOI":"10.1134\/S106193481009008X","article-title":"Determination of Hg in water and wastewater samples by cv-aas following on-line preconcentration with silver trap","volume":"65","author":"Asghari","year":"2010","journal-title":"J. Anal. Chem."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"693","DOI":"10.1016\/j.jhazmat.2006.07.028","article-title":"On-line preconcentration and determination of mercury in biological and environmental samples by cold vapor-atomic absorption spectrometry","volume":"141","author":"Cerutti","year":"2007","journal-title":"J. Hazard. Mater."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"365","DOI":"10.1016\/S0584-8547(01)00393-7","article-title":"Sensitive determination of mercury in tap water by cloud point extraction pre-concentration and flow injection-cold vapor-inductively coupled plasma optical emission spectrometry","volume":"57","author":"Wuilloud","year":"2002","journal-title":"Spectrochim. Acta Part B At. Spectrosc."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"659","DOI":"10.1016\/j.sab.2004.12.009","article-title":"Evaluation of slurry preparation procedures for the determination of mercury by axial view inductively coupled plasma optical emission spectrometry using on-line cold vapor generation","volume":"60","author":"Herrmann","year":"2005","journal-title":"Spectrochimi. Acta Part B At. Spectrosc."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"269","DOI":"10.1016\/0003-2670(93)85131-3","article-title":"Simultaneous determination of traces of iron, cobalt, nickel, copper, mercury and lead in water by energy-dispersive x-ray fluorescence spectrometry after preconcentration as their piperazino-1,4-bis(dithiocarbamate) complexes","volume":"280","author":"Lau","year":"1993","journal-title":"Anal. Chim. Acta"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"755","DOI":"10.1016\/j.sab.2004.03.009","article-title":"Gas chromatography\/plasma spectrometry\u2014A important analytical tool for elemental speciation studies","volume":"59","author":"Wuilloud","year":"2004","journal-title":"Spectrochimi. Acta Part B At. Spectrosc."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"147","DOI":"10.1016\/S0584-8547(01)00363-9","article-title":"Mechanistic studies on the trapping and desorption of volatile hydrides and mercury for their determination by electrothermal vaporization-inductively-coupled plasma mass spectrometry","volume":"57","author":"Matousek","year":"2002","journal-title":"Spectrochimi. Acta Part B At. Spectrosc."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1141","DOI":"10.1016\/S0039-9140(01)00546-X","article-title":"Determination of very low levels of dissolved mercury(ii) and methylmercury in river waters by continuous flow with on-line uv decomposition and cold-vapor atomic fluorescence spectrometry after pre-concentration on a silica gel-2-mercaptobenzimidazol sorbent","volume":"55","author":"Bagheri","year":"2001","journal-title":"Talanta"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"171","DOI":"10.1016\/j.sab.2010.01.003","article-title":"Determination of mercury by electrochemical cold vapor generation atomic fluorescence spectrometry using polyaniline modified graphite electrode as cathode","volume":"65","author":"Jiang","year":"2010","journal-title":"Spectrochimi. Acta Part B At. Spectrosc."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1029","DOI":"10.1016\/S1872-2040(08)60116-4","article-title":"Determination of trace inorganic mercury in mineral water by flow injection on-line sorption preconcentration-cold vapor atomic fluorescence spectrometry","volume":"37","author":"Zi","year":"2009","journal-title":"Chin. J. Anal. Chem."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"329","DOI":"10.1016\/S0003-2670(02)01520-9","article-title":"New triiodomercurate-modified carbon paste electrode for the potentiometric determination of mercury","volume":"478","author":"Abbas","year":"2003","journal-title":"Anal. Chim. Acta"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"602","DOI":"10.1016\/j.jhazmat.2009.01.018","article-title":"A mercury(ii) selective sensor based on n,n\u2032-bis(salicylaldehyde)-phenylenediamine as neutral carrier for potentiometric analysis in water samples","volume":"167","year":"2009","journal-title":"J. Hazard. Mater."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"139","DOI":"10.1016\/j.jelechem.2008.08.007","article-title":"An ion selective electrode for mercury (ii) based on mercury (ii) complex of poly(4-vinyl pyridine)","volume":"624","author":"Bakhtiarzadeh","year":"2008","journal-title":"J. Electroanal. Chem."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"347","DOI":"10.1016\/j.aca.2004.03.098","article-title":"Ion-selective carbon paste electrode based on tetraethyl thiuram disulfide for copper (ii) and mercury (ii)","volume":"524","author":"Gismera","year":"2004","journal-title":"Anal. Chim. Acta"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"575","DOI":"10.1016\/j.talanta.2004.11.028","article-title":"A highly selective mercury electrode based on a diamine donor ligand","volume":"66","author":"Gupta","year":"2005","journal-title":"Talanta"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"285","DOI":"10.1016\/S0039-9140(00)00445-8","article-title":"Novel mercury(ii) ion-selective polymeric membrane sensor based on ethyl-2-benzoyl-2-phenylcarbamoyl acetate","volume":"53","author":"Hassan","year":"2000","journal-title":"Talanta"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"10","DOI":"10.1016\/j.snb.2006.01.033","article-title":"Inamuddin. Applications of Hg (II) sensitive polyaniline Sn (iv) phosphate composite cation-exchange material in determination of Hg2+ from aqueous solutions and in making ion-selective membrane electrode","volume":"120","author":"Khan","year":"2006","journal-title":"Sens. Actuators B Chem."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"402","DOI":"10.1016\/j.jhazmat.2010.07.039","article-title":"Multi-walled carbon nanotubes-ionic liquid-carbon paste electrode as a super selectivity sensor: Application to potentiometric monitoring of mercury ion(ii)","volume":"183","author":"Khani","year":"2010","journal-title":"J. Hazard. Mater."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"111","DOI":"10.1016\/S0022-0728(02)01298-6","article-title":"A mercury ion-selective electrode based on a calixarene derivative containing the thiazole azo group","volume":"540","author":"Lu","year":"2003","journal-title":"J. Electroanal. Chem."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"101","DOI":"10.1016\/S0039-9140(02)00473-3","article-title":"A mercury (ii) ion-selective electrode based on neutral salicylaldehyde thiosemicarbazone","volume":"59","author":"Mahajan","year":"2003","journal-title":"Talanta"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"237","DOI":"10.1016\/j.jhazmat.2008.12.107","article-title":"Highly selective potentiometric determination of mercury(ii) ions using 1-furan-2-yl-4-(4-nitrophenyl)-2-phenyl-5h-imidazole-3-oxide based membrane electrodes","volume":"167","author":"Mahajan","year":"2009","journal-title":"J. Hazard. Mater."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"73","DOI":"10.1016\/S0039-9140(03)00036-5","article-title":"Mercury (ii) ion-selective polymeric membrane sensor based on a recently synthesized schiff base","volume":"60","author":"Mashhadizadeh","year":"2003","journal-title":"Talanta"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"80","DOI":"10.1016\/S0925-4005(00)00300-2","article-title":"Mercury selective membrane electrodes using 2-mercaptobenzimidazole, 2-mercaptobenzothiazole, and hexathiacyclooctadecane carriers","volume":"63","author":"Mazloum","year":"2000","journal-title":"Sens. Actuators B Chem."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"2154","DOI":"10.1016\/j.msec.2009.04.017","article-title":"Mercury (ii) selective membrane electrode based on 1,3-bis(2-methoxybenzene)triazene","volume":"29","author":"Rofouei","year":"2009","journal-title":"Mater. Sci. Eng. C"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"36","DOI":"10.1016\/j.snb.2003.09.004","article-title":"Mercury(ii)-selective membrane electrode using tetrathia-diazacyclotetradeca-2,9-diene as neutral carrier","volume":"99","author":"Singh","year":"2004","journal-title":"Sens. Actuators B Chem."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"467","DOI":"10.1016\/j.snb.2009.02.011","article-title":"Highly selective sensing of mercury (ii) by development and characterization of a pvc-based optical sensor","volume":"138","author":"Yari","year":"2009","journal-title":"Sens. Actuators B Chem."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"352","DOI":"10.1016\/j.snb.2006.08.041","article-title":"Mercury(ii)-selective polymeric membrane electrode based on the 3-[4-(dimethylamino)phenyl]-5-mercapto-1,5-diphenylpentanone","volume":"123","author":"Yu","year":"2007","journal-title":"Sens. Actuators B Chem."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"14968","DOI":"10.3390\/s121114968","article-title":"Flow injection analysis of mercury using 4-(dimethylamino) benzaldehyde-4-ethylthiosemicarbazone as the ionophore of a coated wire electrode","volume":"12","author":"Tahir","year":"2012","journal-title":"Sensors"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"306","DOI":"10.1016\/j.cej.2013.03.082","article-title":"Palm shell activated carbon impregnated with task-specific ionic-liquids as a novel adsorbent for the removal of mercury from contaminated water","volume":"225","author":"Ismaiel","year":"2013","journal-title":"Chem. Eng. J."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"234","DOI":"10.1016\/j.electacta.2009.08.044","article-title":"Multi-walled carbon nanotubes (mwcnts) and room temperature ionic liquids (rtils) carbon paste er (iii) sensor based on a new derivative of dansyl chloride","volume":"55","author":"Faridbod","year":"2009","journal-title":"Electrochim. Acta"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"308","DOI":"10.1016\/j.snb.2008.02.027","article-title":"Potentiometric response of ion-selective membranes with ionic liquids as ion-exchanger and plasticizer","volume":"133","author":"Peng","year":"2008","journal-title":"Sens. Actuators B Chem."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"126","DOI":"10.1016\/j.aca.2007.12.011","article-title":"Applications of ionic liquids in electrochemical sensors","volume":"607","author":"Wei","year":"2008","journal-title":"Anal. Chim. Acta"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"279","DOI":"10.1016\/S0003-2670(00)85640-8","article-title":"Determination of selectivity coefficients of ion-selective electrodes by a matched-potential method","volume":"164","author":"Gadzekpo","year":"1984","journal-title":"Anal. Chim. Acta"},{"unstructured":"Roland St. Kalb, M.J.K. Task-specific ionic liquids. Available online: http:\/\/www.sigmaaldrich.com\/technical-documents\/articles\/chemfiles\/task-specific-ionic0.html.","key":"ref_35"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"2527","DOI":"10.1351\/pac199466122527","article-title":"Recommendations for nomenclature of ion selective electrodes","volume":"66","author":"Buck","year":"1994","journal-title":"Pure Appl. Chem."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"2174","DOI":"10.1002\/elan.200603643","article-title":"A novel modified carbon paste electrode for potentiometric determination of mercury (ii) ion","volume":"18","author":"Mashhadizadeh","year":"2006","journal-title":"Electroanalysis"},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"789","DOI":"10.2116\/analsci.25.789","article-title":"Potentiometric detection of mercury (ii) ions using a carbon paste electrode modified with substituted thiourea-functionalized highly ordered nanoporous silica","volume":"25","author":"Mehran","year":"2009","journal-title":"Anal. Sci."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"694","DOI":"10.1002\/elan.200403099","article-title":"Electrochemical characterization and determination of mercury using carbon paste electrodes modified with cyclodextrins","volume":"17","author":"Galicia","year":"2005","journal-title":"Electroanalysis"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"579","DOI":"10.2116\/analsci.22.579","article-title":"A mercury (ii) ion-selective electrode based on n,n-dimethyl-formamide-salicylacylhydrazone as a neutral carrier","volume":"22","author":"Ye","year":"2006","journal-title":"Anal. Sci."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"133","DOI":"10.1016\/j.snb.2014.03.086","article-title":"On the potentiometric response of mercury(ii) membrane sensors based on symmetrical thiourea derivatives\u2014experimental and theoretical approaches","volume":"199","author":"Fayazi","year":"2014","journal-title":"Sens. Actuators B Chem."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"114","DOI":"10.1016\/j.molliq.2012.10.008","article-title":"Mercury selective potentiometric sensor based on low rim functionalized thiacalix [4]-arene as a cationic receptor","volume":"177","author":"Gupta","year":"2013","journal-title":"J. Mol. Liq."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/14\/7\/13102\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T21:13:51Z","timestamp":1760217231000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/14\/7\/13102"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2014,7,21]]},"references-count":42,"journal-issue":{"issue":"7","published-online":{"date-parts":[[2014,7]]}},"alternative-id":["s140713102"],"URL":"https:\/\/doi.org\/10.3390\/s140713102","relation":{},"ISSN":["1424-8220"],"issn-type":[{"type":"electronic","value":"1424-8220"}],"subject":[],"published":{"date-parts":[[2014,7,21]]}}}