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The Determination of Total Dissolved Inorganic Carbon in Aqueous Solutions

ENSR Consulting and Engineering, 35 Nagog Park, Acton, MA 01720;

David R. Bouldin

Dep. of Soil, Crop and Atmospheric Sciences, Cornell Univ., Ithaca, NY 14853.

^* Corresponding author.

ABSTRACT

Experimental results and theoretical considerations were utilized to develop a method for the precise and accurate determination of total dissolved inorganic carbon (TDIC) in aqueous solutions. A method of preparing standard solutions of Cs₂CO₃ from distilled deionized H₂O which was initially stripped of ambient inorganic carbon (IC) with N_2(g) at 6.90 x 10⁴ Pa for 20 min allowed a means of calibration without systematic error. For a 0.20-mL sample, a quadratic working range of analysis extended from the limit of detection, 1.05 x 10^–5M IC, to 3.44 x 10^–3 M IC. Results are accurate to three significant figures. The smallest R² observed over 4 yr was 0.997. For 0.05-, 0.10-, and 0.20-mL sample volumes, no significant effect of solution volume on detector response was observed. In order to expedite routine analysis, a means of preparing and storing secondary standard solutions of NaHCO₃ for up to 28 d was developed.