from ppb to PPm level PPb至PPm级多元素同时测定
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The gold concentrated with poly-urethane foam was roasted by adding Ni to obtain a stable recovery of gold in ppb Level.
以泡塑富集金、以镍盐作基体改进剂，提高了金的回收率和稳定性。
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That level has been raised to 85 ppb.
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