{"refrec":{"BRefID":286051,"RR":"<b>Loucaides, S.; Rèrolle, V.M.C.; Papadimitriou, S.; Kennedy, H.; Mowlem, M.C.; Dickson, A.G.; Gledhill, M.; Achterberg, E.P.</b> (2017). Characterization of <i>meta</i>-Cresol Purple for spectrophotometric pH measurements in saline and hypersaline media at sub-zero temperatures. <i>NPG Scientific Reports 7(1)</i>: 11 pp. <a href=\"https://dx.doi.org/10.1038/s41598-017-02624-0\" target=\"_blank\">https://dx.doi.org/10.1038/s41598-017-02624-0</a>","BEntID":278073,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>NPG Scientific Reports 7(1)</i>: 11 pp. <a href=\"https://dx.doi.org/10.1038/s41598-017-02624-0\" target=\"_blank\">https://dx.doi.org/10.1038/s41598-017-02624-0</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Loucaides, S.; Rèrolle, V.M.C.; Papadimitriou, S.; Kennedy, H.; Mowlem, M.C.; Dickson, A.G.; Gledhill, M.; Achterberg, E.P.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Loucaides, S. <i>et al.</i>","Englishabstract":"Accurate pH measurements in polar waters and sea ice brines require pH indicator dyes characterized at near-zero and below-zero temperatures and high salinities. We present experimentally determined physical and chemical characteristics of purified meta-Cresol Purple (mCP) pH indicator dye suitable for pH measurements in seawater and conservative seawater-derived brines at salinities (S) between 35 and 100 and temperatures (T) between their freezing point and 298.15 K (25 degrees C). Within this temperature and salinity range, using purified mCP and a novel thermostated spectrophotometric device, the pH on the total scale (pH(T)) can be calculated from direct measurements of the absorbance ratio R of the dye in natural samples as pH(T) = -log(k(2)(T)e(2)) + log(R - e(1)/1 - R-e3/(e2)) Based on the mCP characterization in these extended conditions, the temperature and salinity dependence of the molar absorptivity ratios and - log( k(2)(T)e(2)) of purified mCP is described by the following functions: e(1) = -0.004363 + 3.598 x 10(-5)T, e(3)/e(2) = -0.016224 + 2.42851 x 10(-4)T + 5.05663 x 10(-5)(S-35), and -log( k(2)(T)e(2)) = - 319.8369 + 0.688159 S -0.00018374 S-2 + ( 10508.724 - 32.9599 S + 0.059082S(2)) T-1 + ( 55.54253 - 0.101639 S) ln T -0.08112151T. This work takes the characterisation of mCP beyond the currently available ranges of 278.15 K <= T <= 308.15 K and 20 <= S <= 40 in natural seawater, thereby allowing high quality pHT measurements in polar systems.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Characterization of <i>meta</i>-Cresol Purple for spectrophotometric pH measurements in saline and hypersaline media at sub-zero temperatures","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-06 01:33:34.720308","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2017,"MonPub":null,"DateUpdate":"2018-02-13","DateCreate":"2017-06-07","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000402310700010","VABBcode":null,"OpenAcc":1,"DOI":"10.1038/s41598-017-02624-0"},"refs":null,"anarec":{"AnaID":286051,"PubliDate":2017,"Pagination":"11 pp","XtraPublOfAnaID":null,"ISBN":null,"Volume":"7","Issue":"1","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":208093,"SerRR":"Scientific Reports (Nature Publishing Group). 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