The test work indicated the probability of a pre-concentration stage using a screening, dense media separation or coarse-ore jigging after crushing and screening.
The method of ICP-AES for simultaneous determination of Platinum and Palladium content in copper anode mud with lead fire assaying pre-concentration has been established.
采用铅火试金预富集，ICP - AES法同时测定铜阳极泥中微量铂和钯含量。
3
The concentration of atmospheric carbon, an important indicator of global warming, has shot from 280 parts per million in pre-industrial times to 386 PPM last year and appears to be accelerating.
全球变暖的重要指示——大气的碳浓度——已经从工业社会前的280ppm (parts per million)激增到386 p pm，而且这一速度似乎还在增加。