TCVN 6498-1999 Soil quality Determination of total nitrogen Modifierd Kejldahl method《土质 总氮的测定 改进的凯氏定氮法》.pdf

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ASTM E258-2007(2015) 6419 Standard Test Method for Total Nitrogen in Organic Materials by Modified Kjeldahl Method《采用凯氏定氮法测定有机材料中总氮的标准试验方法》.pdf

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SANS 333-1996 Coal - Determination of nitrogen - Semi-micro Kjeldahl method《煤炭 氮含量测定 半微量凯氏定氮法》.pdf

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