Limnology and Oceanography
A previously described flow injection method for the analysis of ΣCO2 included the addition of ZnCl2 to some samples before analysis in order to precipitate dissolved sulfide (which interferes with the method) as ZnS. However, the use of Zn2+ in samples with high concentrations of dissolved sulfide causes the coprecipitation of ZnCO3, and in our experience with this technique, ZnCO3 also precipitates even in the absence of dissolved sulfide. The addition of molybdate effectively complexes dissolved sulfide without interfering with the determination of ΣCO2 by this technique.
Original Publication Citation
Lustwerk, R.L., & Burdige, D.J. (1995). Elimination of dissolved sulfide interference in the flow-injection determination of ΣCO2 by addition of molybdate. Limnology and Oceanography, 40(5), 1011-1012. doi: 10.4319/lo.1922.214.171.1241
Lustwerk, Rigel L. and Burdige, David J., "Elimination of Dissolved Sulfide Interference in the Flow-Injection Determination of Sigma-CO2 by Addition of Molybdate" (1995). OES Faculty Publications. 79.