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The concentration of PCP was analyzed by high liquid performance (HPLC, Waters, USA), which consists of a waters 1525 binary HPLC pump and a waters 2487 dual ¦Ë absorbance detector with a Kromasil reverse phase C18 column(5 um particle size and 250 ¡Á 4.6 mm). The mobile phase was 15% water (containing 2% acetic acid) and 85% methanol with flow rate of 1.0 mL/min. Detection wavelength was set at 305 nm.
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