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Determination of Calcium with Ion‐Selective Electrode in Black Liquor from a Kraft Pulping Process
Author(s) -
Granholm Kim,
Ek Paul,
Sokalski Tomasz,
Harju Leo,
Bobacka Johan,
Ivaska Ari
Publication year - 2009
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200904633
Subject(s) - chemistry , black liquor , complexometric titration , calcium , inductively coupled plasma mass spectrometry , ion selective electrode , analytical chemistry (journal) , inductively coupled plasma , electrode , kraft paper , titration , inorganic chemistry , mass spectrometry , chromatography , selectivity , plasma , chemical engineering , biochemistry , physics , organic chemistry , quantum mechanics , lignin , catalysis , engineering
A solid‐contact Ca 2+ ‐selective electrode was used to study speciation of calcium in black liquor. During extended time of operation the standard potential was found to change, but the sensitivity of the electrode, and the selectivity coefficients remained unchanged. Laser ablation inductively coupled plasma mass spectrometry (LA‐ICP‐MS) measurements showed sodium sorption to the electrode membrane during the measurement in black liquor. Linearization of the complexometric titration curves were used to determine the concentrations of Ca 2+ , CaOH + as well as weak and strong calcium complexes. With inductively coupled plasma optical emission spectrometry (ICP‐OES), similar total calcium concentrations were obtained as by the EDTA titration.