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Fig. 1. Flow injection manifold for detecting carbon dioxide in persulfate digest. Injection valve is shown in the inject position. Reagents, standards, and diffusion block are described in the text. Nominal flow rates are listed; actual flow rates are approximately 2.5 times greater; tubing colors are in parentheses. Manifold tubing is 0.8 mm i.d. (5.2 µL cm^–1); 5-cm mixing coil has 70 cm of tubing.