These would react with barium ions in the test, giving an incorrect positive result. Explain why, in a test for halide ions, the sample is acidified with dilute nitric acid first. Carbonate ions ...

Würzburg chemists have succeeded in controlling the passage of halide ions by deliberately introducing defects into a two-layer nanographene system. Their results have been published in Nature.

The penetrated halide ions are bound in this cavity so that the time required for entry could be measured. The results have been published in the journal Nature .