Istituto di Geoscienze e Georisorse     
Cioni R., Gambardella B., Marini L. Field determination of total dissolved inorganic carbon (TDIC) in natural waters using an IR analyzer - I. Preliminary laboratory tests. In: Geothermics, vol. 36 (1) pp. 47 - 62. Elsevier, 2007.
Preliminary laboratory tests carried out on 20 mineral waters indicate that the infrared (IR) method for the determination of total dissolved inorganic carbon (TDIC) is more accurate than the pH-alkalinity method, especially for high-TDIC, naturally sparkling waters and low-TDIC waters. The results of the two analytical methods are similar for mineral waters whose TDIC ranges from 100 to 500 mg/L as HCO3, suggesting a relative accuracy of 0.3-2.9%. The limit of detection (LOD) of the IR method is close to 10 mg HCO3/L and independent of pH. This value is comparable with the LOD of the pH-alkalinity method in the pH range 6.5-9 whereas the LOD of the latter increases strongly with decreasing pH below pH 6.5. The IR method is quick, since a run takes a few minutes and, on average, 10 analyses are carried out in an hour, including the time spent for clean up and preparation between samples. It constitutes a sound alternative to the pH-alkalinity technique for the field measurement of TDIC in geothermal and other natural waters.
URL: http://https://www.journals.elsevier.com/geothermics
Subject total dissolved inorganic carbon (TDIC)
natural waters
geothermal waters
infrared (IR) analyzer

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