The procedure was described, including extraction by acetone and dichloromethane, cleaning up by passing through a column made up of neutral alumina and active carbon, determination by GC with NPD.
样本用丙酮提取，加二氯甲烷萃取，通过中性氧化铝和活性炭混合柱层析净化，然后上气相色谱用NPD检测。
We are cleaning up the data and we have discovered the name column is full of similar names that represent the same company.
我们正在清理数据，我们发现名称列满是类似的名字代表同一公司。
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