SEQUENTIAL INJECTION-ANALYSIS OF NITRITES AND NITRATES

被引：60
|
作者：
OMS, MT [1 ]
CERDA, A [1 ]
CERDA, V [1 ]
机构：
[1] UNIV ILLES BALEARS,DEPT QUIM,E-07071 PALMA DE MALLORCA,SPAIN
来源：
ANALYTICA CHIMICA ACTA | 1995年 / 315卷 / 03期
关键词：
FLOW SYSTEM; NITRATES; NITRITES; SEQUENTIAL INJECTION ANALYSIS;
D O I：
10.1016/0003-2670(95)00316-R
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A sequential injection system for the analysis of nitrate and nitrite is described. The sample and reagents are aspirated and mixed by flow reversal while being propelled to a reaction coil or to the detector. The determination of nitrite is based on the Griess-llosvay reaction. Nitrate is previously reduced by hydrazine in alkaline medium and analyzed as nitrite. The sequencing and overlap of the stacked zones are key parameters that have been studied together with concentrations of reagents, influence of temperature and potential interfering ions. Under the final optimal conditions up to 400 mu M Of nitrite and nitrate can be analyzed, the detection limits being 0.07 ppm and 0.2 ppm respectively. The method has been tested with prepared standard samples, atmospheric aerosol filter extracts and wastewater samples.
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页码：321 / 330
页数：10
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