Stripping Efficiency. The water flow rate was varied while holding the stripping gas flow constant at 20 ml/min. The nitrogen peak areas increased linearly with increasing WFR to about 12 ml/min indicating complete stripping. The pumps are normally run at 4 ml/min. Effect of Hydrazine Concentrations. Experiments demonstrated that reducing the hydrazine sulfate concentration by one half had no effect on the yield of NO. The yield was linear over the current densities used.Precision and Accuracy. The relative standard deviation is typically 0.5 for 4 samples. The accuracy is more difficult to assess: The resistor was calibrated to 1000.01 ohms. The digital integrator is accurate to 0.1 (ignoring false base-line tripping due to signal noise). The digital voltmeter is calibrated to 0.2%. The flow measurement is certainly accurate to 0.1 %. Therefore, the total error in accuracy is at most 0.5 %, Seawater Itesults. About 300 samples were successfully analyzed for Nz and Ar in this laboratory and aboard ship during the pa st year.
ACKNOWLEDGMENTThe author thanks P. J. Wangersky, R. C. Cooke, and T.Yoshinari for advice in developing this method.
results in a higher sensitivity than when stored in air. Such dependence on environment is not unexpected for an active electrode surface.The results here suggest that the lead dioxide electrode is potentially applicable to the monitoring and investigation of a wide variety of titration reactions.
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