The sample, after being purged by reversed extraction and purified byPVP - kieselguhr column, was enriched through Amberlite XAD - 7 column.样品经过乙酸乙酯反萃取及PVP - 硅藻土层析柱后, 再径XAD - 7柱浓缩....

n.硅藻土...

kieselguhr的音标：kieselguhr的英式发音音标为：['ki:zəlgʊə]kieselguhr的美式发音音标为：['kizəlˌgʊr]...