In this paper we demonstrate another application of this inexpensive versatile platform using the moving drop for (NH
)gas collection, quantitating the collected gas conductometrically by momentarily stopping the drop at a measurement probe and then transmitting all to waste by sending a merging wash drop. Ammonia gas was liberated from a NH
-containing solution by alkalinization and purging and directed to the drop. Results from real samples are compared with spectrophotometric determination by the indophenol blue method, which often requires sample pretreatment