| 碱性过硫酸钾消解紫外分光光度法测定水中微量总氮影响因素分析 |
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| 引用本文： | 李莉.碱性过硫酸钾消解紫外分光光度法测定水中微量总氮影响因素分析[J].干旱环境监测,2014(3):129-134. |
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| 作者姓名： | 李莉 |
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| 作者单位： | 淮北市环境保护监测站,安徽淮北235000 |
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| 摘 要： | 采用国标《碱性过硫酸钾消解紫外分光光度法》（ HJ 636-2012）测定水中总氮（ TN），虽然实验步骤简单，但影响因素较多，需严格控制实验条件。本文针对含量在方法检出限0．05 mg/L附近的微量总氮水样，从实验用水、器皿的处置、试剂的配制与存放、消解样品的制作与冷却时间等方面考察了总氮空白值的控制、校准曲线的选取等影响因素，优化了实验条件，结果令人满意。
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| 关 键 词： | 总氮 紫外分光光度法 空白 校准曲线 |
Influencing factors in the Determination of trace total nitrogen in water by alkaline potas ium persulfated igestio n UV specrt ophotometric method |
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| LI Li.Influencing factors in the Determination of trace total nitrogen in water by alkaline potas ium persulfated igestio n UV specrt ophotometric method[J].Arid Environmental Monitoring,2014(3):129-134. |
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| Authors: | LI Li |
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| Institution: | LI Li (Huaibei Environmental Monitoring Station, Huaibei Anhui 235000, China) |
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| Abstract: | It is an easy procedure to determinate the total nitrogen （ TN） using a national standard entitled as alkaline potassi-um persulfate digestion -UV spectrophotometric method （HJ 636-2012）.However, it should be strictly controlled the pa-rameters to avoid so many influences during the experiment .The subject of this study is determinate the total nitrogen （ TN） of a trace concentration （0.05 mg/L） sample.The factors, such as the disposal of water and containers , the preparation and storage of reagents and digestion sample preparation and cooling , were investigated to control the TN blank and select the cali-bration curve.Based upon these results , the optimum conditions were obtained to determinate the trace TN in the water sam-ple. |
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| Keywords: | TN UV spectrophotometry blank calibration curve |
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