The Determination of Total Dissolved Inorganic Carbon in Aqueous Solutions
- Seth H. Frisbie * and
- David R. Bouldin
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 N2(g) at 6.90 × 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 × 10−5 M IC, to 3.44 × 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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