文档介绍：本科生毕业论文
题目流动注射分光光度法检测制革废水中的氨氮
流动注射分光光度法测定制革废水中的氨氮
摘要:制革废水中含有大量的氨氮,若不经处理直接排放到环境中,会对环境造成严重危害。制革过程产生的氨氮污染主要来自两个方面:一是加工过程中加入的各种铵盐;二是来自皮革本身由有机氮转化而来的氨氮。由于技术、经济的因素,许多制革企业仍使用大量的铵盐。产生氨氮的工序有浸水、脱毛、浸灰、脱灰、软化、浸酸、鞣制、中和染色等工序。本论文利用流动注射分光光度法原理,建立了一种灵敏度高、操作相对简单并可用于现场测定制革废水中氨氮含量的检测体系。主要实验原理是在亚硝基铁氰化钠的存在下,氨氮在碱性水溶液中与水杨酸钠和次氯酸钠反应,生成绿色络合物,通过分光光度法进行测定。通过优化实验,确定最优分析条件为:,;波长为630nm;S、C、R1、、、、;;;进样环体积为100μL;显色液R1:配制1000mL的显色液,,;氧化液R2:配制250mL的氧化液R2,,。~,线性相关系数为r= 。精密度RSD=%。应用于实际水样中氨氮的检测,%~%,具有良好的重现性和准确性。
关键词:氨氮,流动注射,分光光度法,制革废水
Flow injection analysis spectrophotometry determine ammonia-nitrogen in the tannery wastes
Major: Light Chemical Engineering
Undergraduate Cao Peng Supervisor Zhang Xinshen
Abstract:Tannery waste water contains a large number of ammonia-nitrogen, it is necessary to undergo a rigorous treatment before discharged. The nitrogen pollution of leather-making process is mainly from tow parts: one is various kinds ammoniacal salt added in leather-making process; another is converted by anonitrogen from leather. As the technology and economy, lots of tanneries still use large amount of ammonium salt. Processes produced ammonia-nitrogen is soaking, unhairing, liming, deliming, bating, pickling, tanning, neutralization and dye. In the processes of deliming and bating, they used ammonium sulfate, ammonium chloride and so on; in the processes of neutralization and dye, ammonium bicarbonate and liquid ammonia also be used; the ammonia-nitrogen in the processes of pickling and tanning is from the residues of ammonium in leather. The ammonia-nitrogen in the raw hides also will go in to the waste water during the processes. Part of the protein in the raw hides will be separated and posed into much of ammonia-nitrogen. Presently, ammonia-nitrogen can be measured by salicylic acid spectropho