Photothermal beam deflection was combined with the established and proven indophenol colorimetric method for the measurement of trace amounts of ammonium ion in water. A 7 mW 632 nm He–Ne laser and a 4 mW 780 nm Al–Ga–As semiconductor laser provided a limit of detection below 0.25 mmol m–3.
E. Strauss, J. Favier, D. Bićanić, K. van Asselt and M. Lubbers, Analyst, 1991, 116, 77 DOI: 10.1039/AN9911600077
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