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YSD-TN-Ⅱ型總氮在線水質分析儀

堿性和加熱條件下，過硫酸鉀將水體中的有機氮化合物、亞硝酸氮和銨態氮氧為硝酸氮；硝酸氮 與還原劑反應生成亞硝酸氮后，與磺胺、萘乙二胺反應生成深紅色偶氮化合物，于540nm波長處 測定吸光度值。

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