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Based on the fact that formaldehyde has a promoting effect on condition that potassium iodide  was easy oxygenated by potassium bromate in sulfuric acid medium, dynamic potentiometry of trace formaldehyde was established by this technology which make iodine ion selective electrode to track I-
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Based on the fact that formaldehyde promotes the rate of oxidation of potassium iodide  by potassium bromate in the presence of sulfuric acid, a sensitive method for the measurement of a trace amount of formaldehyde was established by using dynamic potentiometry with an iodine ion selective electrode to track the generation of  I-.
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