[Help] How to detect the trace oil in the water?

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主题:[Help] How to detect the trace oil in the water?
1楼|simpler|2009-06-23 12:24:48|展开
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【在 GreenGene (kk) 的大作中提到: 】
: RT,thx!
: it's some kind of oil or cream, water-fast. >=1mg/L.
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