[交流] Line 241: it is difficult to understand what kind of sample is spiked.

Line 241: it is difficult to understand what kind of sample is spiked. Please, give details. 原文：Fig. S1 shows the total ion chromatograms (TIC) of the SPE extractions from four real samples (100 mL), including Funan River water, Funan River water spiked with 20.0 ng of 16 PAHs, tap water and skim milk samples. Response: A total of 4 samples were tested, they are respectively Funan River water, Funan River water spiked with 20.0 ng of 16 PAHs, tap water and skim milk samples. Thus, it is 100 mL of Funan River water was spiked with 20.0 ng of 16 PAHs. 个人感觉已经写的很清楚了，这样回复和修改可以吧

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