Determination of the ammonium ion by evolution of ammonia and ultraviolet absorption spectrometry in the gas phase

Determination of ammonium, nitrate, and urea nitrogen in fertilizer by gas-phase molecular absorption spectrometry

“…The appearance of typical recorded peaks is illustrated in Figure 1 of ref 6. The height of the recorded peak above the base line has been shown to be directly proportional to the concentration of the test species in the injected solution over a substantial concentration range (6,8).…”

“…For the measurement of evolved ammonia, the wavelength was set at 194 nm with a slit corresponding to a bandwidth of 2 nm, as recommended by Muroski and Syty (8). For the measurement of the gases evolved from nitrite (believed to be nitrosyl chloride (9) and oxides of nitrogen), absorbance was measured at 195 nm with a bandwidth of 0.7 nm, as suggested by Syty and Simmons (6).…”

“…However, the atomic absorption instrument can be modified very simply to allow molecular absorption measurements in the gas phase without the flame. This has made possible the determination of I-, Br" (1), S032" (2-4), S2~( 5), N02~ (6), CN" (7), and NH4+ (8) in a variety of materials.…”

Atomic line molecular analysis for multicomponent determinations in the gas phase

“…In the past, little analytical use has been made of ultraviolet and vacuum ultraviolet molecular absorption spectroscopy. Syty, et al detected sulphite, sulphide, ammonium ion, iodide, and bromide in liquid samples by converting these ions to the gaseous species so 2 , H 2 s, NH 3 , r 2 and Br 2 and measuring the ultraviolet or visible molecular absorption [11][12][13][14][15][16][17][18]. Fuwa and Vallee detected so 2 using flame absorption at 207 nm [19].…”

A sensitive colorimetric procedure for nitrogen determination in micro-Kjeldahl digests

“…Thus, alternative methods for estimation of liberated ammonia directly from the digest have been examined. These include spectrophotometric estimation of volatilized ammonia (Muroski and Syty, 1980), colorimetric methods (Wall and Gehrke, 1975; Mitcheson and Stowell, 1970), and quantitation using an ammonia specific electrode (Eastin, 1976).…”