The conversion of nitrite is slowed down as contrasted to the conversion of ammonium ions to nitrite.

与铵离子转变为亚硝酸相比， 亚硝酸转变为硝酸是很缓慢的。

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Pig farm wastewater in high concentration of ammonia , ammonium ions and are free to the state of ammonia exist.

猪场废水中的氨氮浓度高，大多以铵离子和游离氨的状态存在。

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The said catalyst is prepared through mix shaping of zeolite with alumina to make up carrier, exchanging na ions in zeolite with ammonium ions, and impregnating with Pt.

该催化剂是将沸石与氧化铝先混合成型、制成载体，然后用铵离子将沸石中的钠离子交换至一定交换度，再用铂金属进行浸渍而制成的。

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This gene is the blueprint for an enzyme called urease, which converts urea into ammonium ions.

ECONOMIST: Stomach turning | The

So by building up the concentration of ammonium ions inside its retaining membrane, H. pylori is able to fend off the destructive attentions of the hydrogen ions in stomach acid and thus live free from competition by less hardy germs.

ECONOMIST: Stomach turning | The