流动注射化学发光法监测环境水中的亚硝酸盐
Determination of Nitrite in Water with Flow Injection Chemiluminescence Method
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摘要:研究发现,酸性亚硝酸根与碱性鲁米诺反应产生很强的化学发光,从而建立了亚硝酸根在线分析化学发 光新方法.此法测定亚硝酸根的线性范围为3.3×10-3~3.3μg/mL,标准曲线是I=729.09c+36.3(n=13,R2 =0.993),相对标准偏差为1.03%(0.17μg/mL亚硝酸根,n=11)和4.38%(0.017μg/mL亚硝酸根,n=11), 检出限为1.6×10-3μg/mL.将此法运用于环境水体中亚硝酸根的监测,具有灵敏度高、线性范围宽和不产生二次 污染的优点.Abstract:A new chemiluminescence method for the determination of nitrite in water is presented. This method is based on nitrite reaction with hydrogen dioxide solution with catalyst acid to create peroxynitrous acid. Peroxynitrous acid reacts with alkaline solution of luminol, producing chemiluminescence. The linear range for nitrite is 3.3×10-3to 3.3μg/mL with a detection limit of 1.6×10-3μg/mL, and the relative standard detection is 1.03% for 0.17μg/mL NO-2and 4.38% for 0.017μg/mL NO-2. This method has obtained satisfactory results in the analysis of natural waters.
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