Hybrid fluorometric flow analyzer for ammonia

Analytical Chemistry
N AmornthammarongPurnendu K Dasgupta

Abstract

We describe a robust, highly sensitive instrument for the determination of ambient ammonia. The instrument uses two syringe pumps to handle three liquids. The flow configuration is a hybrid between traditional flow injection (FI) and sequential injection (SI) schemes. This hybrid flow analyzer spends approximately 87% of its time in the continuous flow FI mode, providing the traditional FI advantages of high baseline stability and sensitivity. The SI fluid handling operation in the remaining time makes for flexibility and robustness. Atmospheric ammonia is collected in deionized water by a porous membrane diffusion scrubber at 0.2 L/min with quantitative collection efficiency, derivatized on-line to 1-sulfonatoisoindole, and measured by fluorometry. In the typical range for ambient ammonia (0-20 ppbv), response is linear (r2 = 0.9990) with a S/N = 3 limit of detection of 135 pptv (15 nM for 500 microL of injected NH4+(aq)) with an inexpensive light emitting diode photodiode-based detector. Automated operation in continuously repeated, 8-min cycles over 9 days shows excellent overall precision (n = 1544 p(NH)3 = 5 ppbv, RSD = 3%). Precision for liquid-phase injections is even better (n = 1520, [NH4+(aq)] = 2.5 microM, RSD = 2%)....Continue Reading

References

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Citations

May 14, 2014·Annual Review of Analytical Chemistry·Mirek MackaPurnendu K Dasgupta
May 15, 2010·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Saowapak TeerasongNuanlaor Ratanawimarnwong
Jun 6, 2013·Environmental Science. Processes & Impacts·Natchanon AmornthammarongMichael W Kindel
Mar 25, 2021·Analytical Chemistry·Charles Phillip ShelorPurnendu K Dasgupta
Jan 26, 2008·Analytical Chemistry·Natchanon Amornthammarong, Jia-Zhong Zhang
Mar 21, 2008·Environmental Science & Technology·In-Yong EomPurnendu K Dasgupta
Jun 12, 2021·Journal of Hazardous Materials·Aida Javadian-SarafMohammad Arjmand

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