Solubility of ammonia in liquid water and generation of trace levels of standard gaseous ammonia |
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| Institution: | 1. Cranfield Water Science Institute, Vincent Building, Cranfield University, Bedfordshire MK43 0AL, UK;2. Anglian Water, Block C-Western House, Peterborough Business Park, Peterborough PE2 6FZ, UK;3. Northumbrian Water, Boldon House, Wheatlands Way, Durham DH1 5FA, UK;4. Severn Trent Water, 2 St. Johns Street, Coventry CV1 2LZ, UK |
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| Abstract: | Equilibrium gas phase concentration of ammonia in dilute solution has been measured as a function of total ammonia + ammonium concentration (0.002–0.10 M), pH (6–10) and temperature (278.8?290.6 K). Henry's Law is obeyed under these conditions and may be expressed as In KH(M atm?1) = 4092/T ?9.70 with a relative standard error of less than 5 %, in good agreement with NBS thermodynamic data. Convenient generation of trace levels of ammonia (1.33 × 10?8–7.77 × 10?4 atm) using a porous membrane tube is described. |
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