| 一种新型熏力分相器在流动注射液-液萃取原子吸收间接测定硝酸根的应用 |
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| 关键词:on-line liquid-liquid extraction new gravitational phase separator atomic absorption spectrometry nitrate nitrite |
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| Atomic Absorption Spectrometric Indirect Determination of Nitrate and Nitrite by On-line Liquid-Liquid Extraction with a New Gravitational Phase Separator |
| Nitrate reacts with bis (2,9-dimethy 1-1, 10-phenanthrolinato)copper (I) to form an ion-pair which is subsequently extracted into 4-methy 1-2-pentanone. By measuring the atomic absorption signal of copper in the organic phase, mixture of NO-3 and NO2- can be sequentially determained. In one aliquot of sample, nitrite is oxdised by Ce (Ⅳ), so that total nitrate is determined. In another, nitrite is designed versatile phase separator has been applied to the extraction manifold. Experimental conditions and mani-fold parameters were investigated in detail. The proposed method is effective, with a de-tection limit of 0.028 mg/L of NO3-, the precision is 1.85% RSD for 0.25mg/L of NO3- (n=10) and a sampling rate of 25 samples per hour can be achieved. Recoveries of NO3- in water samples are 100%-110%. |
| Qiu Haiou,Shuai Qin,Tang Zhiyong,Liu Shoulin.1996.Atomic Absorption Spectrometric Indirect Determination of Nitrate and Nitrite by On-line Liquid-Liquid Extraction with a New Gravitational Phase Separator[J].Acta Geoscientica Sinica,17(z1):258-263. |
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