水质中总氮的测定毕业论文

水质总氮测定方法如下

1.碱性过硫酸钾紫外分光光度法（HJ 636-2012）：现如今，水质监测的主要方法，如英国RAIKING，中国锐泉等品牌是主流的在这个标准基础上优化的在线监测产品。

2.气相分子吸收光谱法：该方法主要应用于实验室。

3.也有采用氨氮、硝酸根、亚硝酸根分别进行测量，然后将结果累加值作为总氮的测量结果。典型应用如德国WTW。

在环境地表水、水质监测领域，碱性过硫酸钾紫外分光光度法以及优化方法是当前的主要方法。

拓展资料：总氮，简称为TN，水中的总氮含量是衡量水质的重要指标之一。总氮的定义是水中各种形态无机和有机氮的总量。包括NO3-、NO2-和NH4+等无机氮和蛋白质、氨基酸和有机胺等有机氮，以每升水含氮毫克数计算。常被用来表示水体受营养物质污染的程度。

水中的总氮含量是衡量水质的重要指标之一。其测定有助于评价水体被污染和自净状况。地表水中氮、磷物质超标时，微生物大量繁殖，浮游生物生长旺盛，出现富营养化状态。

Abstract: total phosphorus in water, nitrogen and COD (chemical oxygen demand) is reflected in the importance of water quality indicators, in general, because of self-purification capacity of water, natural water of nitrogen and phosphorus content and COD value is not high and the trend On the stability. But with the accelerated process of urbanization, urban industrial building high-speed development in recent years, urban sewage and industrial wastewater emissions were rising trend year by year, fertilizer, metallurgy, printing and dyeing, synthetic detergent industries such as wastewater, sewage life Water and water for agricultural use, with a large number of nitrogen and phosphorus compounds, the COD value is high. Through various channels such sewage into the water, all kinds of phosphate in water, organic and inorganic nitrogen content of nitrogen compounds will continue to improve, a direct impact on water quality. Material increase in nitrogen and phosphorus in water, algae and micro-organisms will lead to excessive breeding, large consumption of dissolved oxygen in water. When more than the load of water, will result in decreased water transparency, eutrophication, and other adverse effects, so that the water quality the other hand, China's annual COD only in the liquid waste generated in the form of environmental emissions of mercury and silver of sulfuric acid on a few tonnes, the environmental pollution caused by the secondary has been not to be ignored. Determination of potassium dichromate and used water samples COD not only time-consuming energy, water back, reagent consumption also great. It can be said that we have been adopted by the COD of the water quality is not consistent with the way the concept of environmental sum up, with the water quality of the increasing deterioration of the situation, water quality monitoring in the determination of nitrogen and phosphorus to the improvement of water quality monitoring and protection is of great significance, and improve the existing COD or on the determination of low energy consumption, Reagents used and less time-precise determination of the new, equally positive and important article from the multi-pronged approach to study high temperature and high pressure digestion, microwave confined digestion, digestion and a series of heated water bath TP digestion of the total nitrogen, as well as the standard return, microwave digestion and a series of COD determination of the digestion. Through the TP TN COD content of the results of different methods of comparison, and various microwave digestion time and return to standard time that the effect of digestion sample comparison of research, improvement of the original determination, or find a new technology Means to achieve rapid and effective sample decomposition, shorten the time for the purpose of digestion, and can greatly reduce the digestion of the samples in the loss and pollution, improve the determination of precision and accuracy, expanding the scope of application methods, while exploring a new approach And the classic method of comparability, and its practical application in the superiority of developed a variety of water suitable for TP TN COD of the rapid digestion of accurate, the new method is simple system, to improve the water and wastewater monitoring Analysis at the same time, to a certain social words: total phosphorus (TP); Total Nitrogen (TN); chemical oxygen demand (COD); microwave digestion; optimum conditions