Chemiluminescent Flow Determination of Nitrates in Water
Institute of Analytical Chemistry, Academy of Sciences of the Czech Republic, Brno
A fast and simple flow-injection method for sensitive automated determination of nitrates in various water samples is described. The method is based on the on-line photolytic conversion of nitrate in a quartz capillary to nitrite, which is determined by a chemiluminescent reaction. The photolytic conversion provides ecological detection of nitrate as compared with nitrate reduction at copperized cadmium. The detection limit is 2 10-7 M nitrate, the calibration curve is linear to 1 10-5 mol.l-1. The efficiency of conversion of nitrate to nitrite is 63 %. The method is usable for the simultaneous determination of nitrate and nitrite in water.
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