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Under specified conditions, add potassium permanganate solution to the sample to be tested, compare it with the standard colorimetric solution, and observe the time required for the test solution to fade
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Note: No.
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Pipette 20mL of the sample into a 50mL colorimetric tube, then add 6mL of water, and place it in a constant temperature water bath at 15°C±0.
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Potassium permanganate time: the time from adding potassium permanganate solution to the time when the potassium permanganate color in the test solution fades or the color of the test solution reaches the same level as the standard colorimetric solution, in minutes
Take the arithmetic mean of the two parallel determination results as the determination result
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