例如在地球上，铂和铂系元素在地表上虽然罕见，但人们认为在富含金属的地核里却是较为常见的。
On Earth, for example, platinum and its allied elements, though rare at the surface, are reckoned more common in the planet's metal-rich core.
作为不对称变色酸双偶氮试剂的二溴硝基偶氮氯膦与金属钯可发生显色反应，而与同属铂系元素的其他五种金属的显色反应并不明显；
DBNCPA of asymmetry acid bis-diazo reagent have the color reaction with the metal palladium, but have not obvious color reaction with other five kind of metal elements of the platiniridium.
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