However, extraction time, increase the amount of liquid case, the heavy metal extraction efficiency is improved.
但在萃取时间、萃取液的总量增加的情况下，各重金属萃取效率得到提高。
To separate and evaluate heavy metal fractions properly, the proposed sequential extraction method was optimized by single extraction procedure.
采用单一萃取程序对建立的重金属形态连续萃取方法的萃取条件进行优化。
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