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Procedure for mixing solutions in the ammonia-, urea-, and creatinine-sensing sites. (a) The electrolyte solution fills the sensing area. (b) A sample solution and a NaOH solution are transported to the mixing area. (c) The two solutions are mixed when the potential is applied to the mixing electrode. (a& prime;) ∼ (c& prime;) show a series of photographs of transports of dyed solutions.
