Abstract
Nitrate concentration (2–100 μg NO 3-N1 −1) in water samples as small as 5 ml can be determined manually in test tubes by a modification of the standard cadmium reduction method without loss of sensitivity. Once reaction tubes are prepared, 30 samples can be batch-processed in one hour by this technique. Reaction tubes can be used 5–10 times before the reactivation of the cadmium is necessary.
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