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One-half liter of each water sample spiked with NDMA standard at a given concentration was extracted using solid phase extraction (SPE) procedures similar to those described elsewhere [1]. NDMA-d6-was added to samples as a surrogate prior to sample preparation to monitor extraction efficiency. The eluent from the SPE column was reduced to 0.5 mL using a gentle stream of nitrogen at room temperature. The sample was then brought to 1.0 mL with dichloromethane. The final concentration factor was 500 fold. Çë½ÌÒ»ÏÂÕâ¸ö²ÉÓùÌÏàÝÍÈ¡·½·¨µÄÑùÆ·ÖÆ±¸¹ý³ÌÊÇʲôÑùµÄ£¬×Ô¼ºÅª²»Ì«Çå³þ£¬Àí½â²»ÁË£¬Ð»Ð» |
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