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自从杜馬(Dumas)創始测氮法,以及后来普利格尔(Pregl)又进而改成微量方法以来,已有四十多年的历史了。杜馬的微量測氮法已被广泛利用,并公认为有
More than 40 years have passed since Dumas started the nitrogen measurement, and later, the Pregl has been further refined. Dumas trace nitrogen measurement method has been widely used, and is generally recognized as