凯氏定氮仪在固废全氮测定中的应用研究

Application of Kjeldahl Nitrogen Analyzer in Total Nitrogen Determination of Municipal Domestic Refuse

固体废物中全氮的测定一般采用半微量开式法(CJ/T 103-1999),此方法存在效率低下、操作困难等问题。对半微量开氏法测定城市生活垃圾中全氮方法进行了研究和改进。一是以数控消解炉替代调温电炉进行样品消解,大大缩短了消解时间;二是以自动凯氏定氮仪替代开氏蒸馏器进行自动蒸馏,方便清洗和样品加入,并和数控消解炉配合使用,提高实验效率。经过实际样品的测定,并与国标测定方法进行对比,证明改进后的测定方法准确可行、实验操作方便,实验效率得到提高,效果良好。

Semi-micro Kjeldahl method is commonly utilized in determination of total nitrogen in solid waste , but there is in-efficiency, operating difficulties and other problems of this method.Therefore, this paper discussed and improved the process by using semi-micro Kjeldahl method to determine total nitrogen in municipal domestic refuse .First, NC digestion oven instead of thermostat electric furnace is used to digest the samples, greatly reducing the digestion time.Secondly, automatic Kjeldahl analy-zer rather than Kelvin distillation automatic distillation is adopted, which simplified the cleaning and sample addition process.The experimental efficiency is improved.After the actual samples determination and comparison with GB determination method , the results show that the improved determination method is accurate, feasible, and easy to operate.