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10 mL C was added. Mix to keep C in contact with the sample fully. Then put it into the instrument (The 50 mL colorimetric tube might be placed in a 1000 mL breaker whose liquid level was higher than it in order to avoid fallen down). All the extraction times were 30 min. During the 15th min, the colorimetric tube was taken out and shaken upside down in order to make the sample in the bottom of the tube sufficient contact with C. The sample in the colorimetric tube was filtered into another 50 mL colorimetric tube through mid-speed qualitative filter paper which was immersed in C beforehand (a small amount of N was previously covered on the filter paper). The final solution volume was kept at 50mL with C. After 15 min, adding 5g of m to absorb o in the samples, shaking up and standing before the solution became clarification. The supernatant was used for the determination of o.

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