In situ flow-injection monitoring of ammonia in landfill leachate

A portable flow-injection instrument incorporating a miniature spectrometer for the real-time monitoring of nitrate in rivers

“…Both baseline stability and reproducibility were excellent with typical RSDs (n ‫ס‬ 3) of Ͻ2%. It is possible to thermostat the instrumentation [8] to provide a stable response, but for this field trial a 5 mg L ‫1מ‬ NO 3 -N standard was used as a reference for all daytime samples. With few exceptions, reproducibility between replicate injections was Ͻ2% RSD (n ‫ס‬ 3), pooled (all three calibrations) RSDs were Ͻ4% (n ‫ס‬ 9), and linear correlation coefficients for all calibrations were good (pooled result: r 2 ‫ס‬ 0.9998, n ‫ס‬ 6).…”