富阳区地表水中硝酸盐氮检测数据
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硝酸盐氮是含氮有机物氧化分解的最终产物，在天然水中以离子形态存在，高浓度的硝酸盐氮会使水环境质量恶化，对鱼类及某些水生生物有危害作用。硝酸盐氮是判定水质好坏的重要指标，从而为地表水的水质分析评价提供事实依据。1、数据来源:按照《水质 硝酸盐氮的测定 紫外分光光度法（试行）HJ/T 346-2007》对地表水进行水样采集检测。2、算法规则: 按照如下公式进行计算:样品浓度C=(A220-2A275-a)×f/b，式中C为样品中硝酸盐氮的质量浓度，单位mg/L；A220为试样在220nm波长下的吸光度值；A275为试样在275nm波长下的吸光度值；a为标准曲线的截距；b为标准曲线的斜率；f为稀释倍数。3、数据判定: 根据《地表水环境质量标准》Ⅲ类限值进行判定，若硝酸盐氮≤10mg/L，则判定地表水中该指标浓度合格，反之不合格。4、数据应用：通过分析水样中的硝酸盐氮质量浓度，我们可以判断该地表水的水质好坏，避免因硝酸盐氮浓度含量超高引起的水质问题，为监管提供依据。
Nitrate nitrogen is the final product of oxidative decomposition of nitrogen-containing organic matter, which exists in ionic form in natural waters. High concentrations of nitrate nitrogen will deteriorate water environmental quality and pose harm to fish and certain aquatic organisms. As a key indicator for water quality assessment, nitrate nitrogen provides factual evidence for water quality analysis and evaluation of surface water. 1. Data Source: Surface water samples were collected and tested in accordance with the Standard for the Determination of Nitrate Nitrogen in Water by Ultraviolet Spectrophotometry (Trial) HJ/T 346-2007. 2. Algorithm Rules: The sample concentration is calculated using the following formula: C=(A220 - 2A275 - a)*f/b, where C is the mass concentration of nitrate nitrogen in the sample, with the unit of mg/L; A220 is the absorbance of the sample at 220 nm wavelength; A275 is the absorbance of the sample at 275 nm wavelength; a is the intercept of the standard curve; b is the slope of the standard curve; f is the dilution factor. 3. Data Judgement: Judgement is made based on the Class Ⅲ limit specified in the Environmental Quality Standards for Surface Water. If the nitrate nitrogen concentration is ≤10 mg/L, the index concentration in the surface water is deemed qualified; otherwise, it is unqualified. 4. Data Application: By analyzing the mass concentration of nitrate nitrogen in water samples, the water quality of the surface water can be evaluated, water quality issues caused by excessive nitrate nitrogen concentration can be avoided, and a basis can be provided for environmental supervision.
