| 摘要 |
<p>A reusable device for continuously monitoring gaseous ammonia concentration in a surrounding environment comprising a plurality of layers, including an active layer in which a dye (e.g., an indicator dye useful for measurement of pH) is immobilized to a membrane (e.g., polyamide membrane), and a hydrophobic filter layer impermeable to liquids and capable of permitting contact between the active membrane and dissolved gaseous ammonia.</p> |
