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Title: A low-cost method for determination of calcium carbonate in cement by membraneless vaporization with capacitively coupled contactless conductivity detection
Authors: Kamonthip Sereenonchai
Saowapak Teerasong
Sumonmarn Chan-Eam
Phoonthawee Saetear
Nathawut Choengchan
Kanchana Uraisin
Natchanon Amornthammarong
Shoji Motomizu
Duangjai Nacapricha
Mahidol University
King Mongkut's Institute of Technology Ladkrabang
National Oceanic and Atmospheric Administration
Okayama University
Keywords: Chemistry
Issue Date: 15-May-2010
Citation: Talanta. Vol.81, No.3 (2010), 1040-1044
Abstract: This work presents a flow analysis method for direct quantitation of calcium carbonate in cement without pretreatment of the sample. The method is based on online vaporization of CO2gas following acidification of the sample inside a small chamber that has a flow of acceptor solution passing around it. Solubilization of the CO2gas into the acceptor stream changes the conductivity of the acceptor solution causing an increase of signal at the capacitively coupled contactless conductivity detection (C4D) placed at the outlet of the vaporization chamber. This chamber is an adaption from previous work reported on 'membraneless vaporization' (MBL-VP). The method can be used in the quality control of production of mixed cement. These cement materials usually have calcium carbonate contents at high concentration range (e.g., 33-99% (w/w) CaCO3). Analysis of samples by this method is direct and convenient as it requires no sample pretreatment. The method is low-cost with satisfactory accuracy and acceptable precision. © 2010 Elsevier B.V.
ISSN: 00399140
Appears in Collections:Scopus 2006-2010

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