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Direct determination of δ 44/42 Ca isotope ratio by ion chromatography/low‐resolution multicollector ICPMS
Author(s) -
Karasinski Jakub,
Bulska Ewa,
Halicz Ludwik,
Wojciechowski Marcin,
Krata Agnieszka Anna
Publication year - 2018
Publication title -
journal of mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 1076-5174
DOI - 10.1002/jms.4039
Subject(s) - chemistry , inductively coupled plasma mass spectrometry , chromatography , analytical chemistry (journal) , mass spectrometry , isotope , resolution (logic) , reproducibility , matrix (chemical analysis) , isotopes of calcium , sample preparation , ion chromatography , stable isotope ratio , calcium , physics , organic chemistry , quantum mechanics , artificial intelligence , computer science
High‐precision on‐line procedure for measurement of calcium isotopic ratio by coupling ion chromatography to multicollector inductively coupled plasma mass spectrometry was developed. Calcium separation from the sample matrix was achieved on an ion chromatography column—IonPac CS16—ID 3 mm connected with CERS 500 2 mm suppressor and followed by multicollector inductively coupled plasma mass spectrometry calcium isotopic ratio determination. Dry plasma mode was used with Aridus II desolvation system. To sustained samples with high level of total dissolved salts as well as account capacity of applied analytical column, the method has been optimized regarding calcium isotope ratio measurements with low‐resolution mass spectrometry. Mass discrimination and instrument drift were corrected by sample‐standard bracketing method using the 44 Ca/ 42 Ca isotope ratio of SRM 915a as a standard. Good accuracy and reasonable precision of calcium isotope ratio (generally 0.20‰ [2SD]) were achieved, which are comparable to off‐line Ca separation and continuous measurement. The reproducibility of the proposed analytical procedure was verified by measuring the SRM 915a standard as a sample randomly over 3 months (n = 56). Applicability of the protocol was demonstrated for matrix‐rich natural water samples, coral samples, and bone standard reference materials.