林仁权, 厉志玉, 金建洪. 新双波长分光光度法测定水中痕量亚硝酸盐氮[J]. 环境与职业医学, 2010, 27(5): 319-320.
引用本文: 林仁权, 厉志玉, 金建洪. 新双波长分光光度法测定水中痕量亚硝酸盐氮[J]. 环境与职业医学, 2010, 27(5): 319-320.
LIN Ren-quan , LI Zhi-yu , JIN Jian-hong . Determination of Trace Nitrite Nitrogen in Water by New Dual-wavelengths Spectrophotometry[J]. Journal of Environmental and Occupational Medicine, 2010, 27(5): 319-320.
Citation: LIN Ren-quan , LI Zhi-yu , JIN Jian-hong . Determination of Trace Nitrite Nitrogen in Water by New Dual-wavelengths Spectrophotometry[J]. Journal of Environmental and Occupational Medicine, 2010, 27(5): 319-320.

新双波长分光光度法测定水中痕量亚硝酸盐氮

Determination of Trace Nitrite Nitrogen in Water by New Dual-wavelengths Spectrophotometry

  • 摘要: 目的 改进测定水中痕量亚硝酸盐氮。

    方法 在酸性介质中,水中亚硝酸盐氮能与对氨基苯磺酰胺重氮化,再与盐酸萘乙二胺产生偶合反应,生成紫红色的产物,根据紫红色的深浅,利用稳定悬浮液吸光特性,测定水中亚硝酸盐氮的新双波长光度法。

    结果 在实验条件下,亚硝酸盐氮浓度在0~0.025μg/mL之间存在线性关系(r=0.99996)。测定波长为540 nm和580 nm。方法检出限为0.0005 mg/L。RSD=1.7%。

    结论 本法用于水中亚硝酸盐氮的测定,灵敏度、精密度均高于盐酸萘乙二胺比色法。

     

    Abstract: Objective To develop a simple and sensitive method for determination of trace nitrite nitrogen in water samples.

    Methods Nitrite nitrogen was determined directly using the Criess diazo-coupling reaction and the formed azo dye was measured at 540 nm and 580 nm in hydrochloric acid medium.

    Results Nitrite nitrogen in the linear concentration range of 0-0.025 μg/mL was determined with a detection limit of 0.000 5 μg/mL. r=0.999 96, RSD=1.7%.

    Conclusion The method has been applied to the determination of trace nitrite nitrogen in water samples. The possible reaction mechanism was also discussed.

     

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