摘要
污泥作为水厂主要副产品,其中的有机质和氮、磷、钾等具有再利用价值.碳、氢、氮含量高低可以间接反映污泥资源再利用价值的大小.因此,文章研究了元素分析仪测定污泥中碳、氢、氮含量,讨论了样品量、卤化物和硫化物以及样品包裹方式对碳、氢、氮测定的影响,建立了元素分析仪测定污泥中碳、氢、氮含量的方法.实验结果表明,样品量为0.10 g、吸收剂为 0.10 g氧化钙、催化剂为 0.05 g五氧化二钒时,能有效解决污泥样品中约 57%的氟、氯、硫对碳、氢测定的干扰;采用锡囊代替锡箔包裹样品,能提高碳、氢、氮测定的稳定性;碳、氢、氮定量限分别为 0.009 2%、0.078%、0.037%.该方法应用于污泥样品及土壤和煤炭标准样品测量时,各元素精密度小于 5.0%,标准样品测量准确度较好.
Abstract
Sludge is the main byproduct of water plants,which contains organic matter,nitrogen,phosphorus,potassium and other resources that can be reused.The content of carbon,hydrogen and nitrogen can indirectly reflect the value of sludge resource reuse.Therefore,the paper studied the determination of carbon,hydrogen and nitrogen content in sludge using elemental analyzer.The effects of sample size,halides,sulfides and sample wrapping methods on the determination of carbon,hydrogen and nitrogen were discussed.A method for determining carbon,hydrogen and nitrogen in sludge using elemental analyzer was established.The experimental results show that when the sample size is 0.10 g,0.10 g calcium oxide is used as the absorbent,and 0.05 g vanadium pentoxide is used as catalyst,it can effectively solve the interference of about 57%of fluorine,chlorine and sulfur in sludge samples on carbon and hydrogen determination;Using tin bags instead of tin foil to wrap the sample can improve the stability of carbon,hydrogen and nitrogen measurements;The quantification limits for carbon,hydrogen and nitrogen are 0.009 2%,0.078%and 0.037%respectively.The method was applied to the measurement of sludge samples,as well as soil and coal standard samples,and the precision of each element was less than 5.0%.The measurement accuracy of standard samples was good.
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