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666酸度的控制是非常严格的,如果酸度过大,就直接影响农作物的生长。过去酸度分析是将试样放在瓷缽中研细,然后用大的瓷漏斗过滤,用蒸馏水洗涤7～10次,滤液用甲基橙作指示剂,以 NaOH 滴定。这样操作比较烦复,同时由于磨洗溅失和洗涤所得的滤液体积较大(约150～200毫升),终点不明显,误差大,操作也不容易掌握。在我们工作中发现用苯溶解试样,以水提取,然后用分液漏斗分液(弃去苯),用甲基橙作指示剂,以 NaOH 滴定。这样操作容易掌握,分析速度快,结果准确。
666 acidity control is very strict, if the acidity is too large, it will directly affect the growth of crops. In the past, the acidity analysis was carried out by grinding the sample in a porcelain bowl, filtering with a large porcelain funnel, washing with distilled water for 7 to 10 times and using methyl orange as the indicator and titration with NaOH. This operation more annoying, at the same time due to washing splashes and washing the resulting filtrate volume larger (about 150-200 ml), the end is not obvious, the error is large, the operation is not easy to grasp. In our work it was found that the sample was dissolved with benzene, extracted with water, then fractionated in a separatory funnel (benzene discarded), methyl orange as an indicator and titrated with NaOH. This operation is easy to grasp, analysis speed, accurate results.