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一、试验目的 在有机碳湿烧重量法分析中,原用无水高氯酸镁作干燥剂,以吸收样品加热氧化和烧碱石棉吸收二氧化碳时所释出之水分。无水高氯酸镁虽然具有吸水性很强的优点,但价格昂贵,不易购买,回收困难(一般都不回收),消耗量大,用时需捣碎,吸水要结块,使用不是最方便。 阳离子交换树脂,其内部具有多孔性的网状结构,所以在干燥状态时也有较强的吸湿能力。树脂具价格低、使用方便、易于购置及回收等优点,使其有可能代替无水高氯酸镁作有机碳湿烧重量法干燥剂之用。
First, the purpose of the experiment In the organic carbon wet weight analysis, the original anhydrous magnesium perchlorate as a desiccant to absorb the sample heated oxidation and caustic soda absorption of carbon dioxide released by the water. Although anhydrous magnesium perchlorate has the advantages of strong water absorption, but expensive, difficult to buy, recovery difficulties (generally not recycled), consumption, when used to be mashed, absorbent to caking, the use is not the most convenient. Cation exchange resin, which has a porous network of internal structure, so in the dry state also has strong moisture absorption capacity. Resin with low prices, easy to use, easy to purchase and recovery advantages, making it possible to replace anhydrous magnesium perchlorate for organic carbon wet weight method desiccant.