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【Daily Question】Chemical Analysis Edition, 3/18/2022

2022-03-18View Original

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The oxygen bottle combustion method is used to determine the organic sulfur content; at pH=4, tholin is used as an indicator, and a barium perchlorate standard solution is employed for titration. The color at the endpoint is difficult to discern, so ________ can be added as a masking agent to change the endpoint color from pale yellow-green to rose red. B A, hexamethylenetetramine B, methylene blue C, sodium sulfite D, lead acetate

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