所谓离子共存，实质上就是判断离子间是否发生反应的问题。若在溶液中能够发生反应，就不能大量共存。判断能否发生反应，不仅是有沉淀、气体、水、难电离的物质产生，还涉及到溶液酸碱性、有色、无色，能否进行氧化还原反应等。
利用自制的离子交换纤维素纸研究了硒和碲的分离以及它们与许多一般离子共存时的分离条件。
Separation of selenium and tellurium and the conditions of separation in the presence of many common ions were investigated by means of cation-exchange. cellulose-paper prepared by ourselves.
试验表明，碘离子及碘酸根离子共存时，该方法能分别测定不同存在形式碘的含量，结果准确可靠。
The experiment indicates that when iodine ions and iodate radicals co-exist, this process can determine iodine content in different forms respectively with accurate and reliable results obtained.
证明在多种金属离子共存的复杂溶液体系中，可以避免其它离子的干扰，使铜选择性地富集到金电极表面。
It is found that the deposition of the Cu 2+ on Au electrode possesses very good selectivity to a more complex solution system containing many other metal ions.
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