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《生物学教学》第10期上刊登的陈慧昭的“观察根的离子交换吸附现象实验用饮用水代替蒸馏水的研究”一文。这对于普通中学和农村中学（包括山区中学）确实能克服材料来源不足的困难。 但我们仔细想想,饮用水的确切标准是什么呢?山区的饮用水,有些是山泉水。农村的饮用水,有些是井水。城市的饮用水有些是经过软化的,也有些是来自本厂建设的水塔。水未经处理。这些饮用水与天然水有什么两样呢?它们的硬度一般都超过25°,即每升水含矿质元素250毫克。因此我认为以上的饮用水中同样含天然水所含的Ca~(2-)、Mg~(2+)、HCO_3~-、CO_3~(2-)、SO_4~2、和NO_3~-等离子,而这里的离子在做根对矿质元素离子的交换吸附实验中同样影响实验效果。
Chen Hui-zhao’s “Study on Drinking Water Replacement of Ion Exchange Adsorption Phenomenon in Experiments” in Biology Teaching, Vol.10. This is true for ordinary middle schools and rural secondary schools (including mountain secondary schools) that can really overcome the difficulties of lack of materials. But we think about it carefully. What is the exact standard of drinking water? Some drinking water in mountain areas is mountain spring water. Some drinking water in rural areas, some well water. Some of the city’s drinking water is softened, and some are water towers built by the factory. Water is untreated. What is the difference between these drinking water and natural water? Their hardness is generally more than 25 degrees, that is, 250 milligrams of mineral elements per liter of water. So I think the above drinking water also contains Ca~(2-), Mg~(2+), HCO_3~-, CO_3~(2-), SO_4~2, and NO_3~- plasmas contained in natural water. The ions here also have an effect on experimental results in the exchange experiments of the mineral ions in the root.