IMPREGNATED FIBROUS CHEMISORBENTS FOR THE COLORIMETRIC DETECTION OF AMMONIA

The paper presents research results on the colorimetric behavior of impregnated fibrous chemisorbents (IFCS) basic gases with visual identification dynamic absorption capacity “response” moment (IFCS-I) during ammonia. Chemisorbents were obtained by impregnation carriers polybasic hydroxyl acid aqueous solutions adding acid-base indicators (Ind). IFCS-I based oxyethylenediphosphonic (IFCS-OEDPA-I), citric (IFCS-CA-I), and malic (IFCS-MA-I) acids used. Azolithine (Az), lakmoid (LA), methyl orange (MO), red (MR), Tropeolin OOO (TrOOO), Congo (CoR), bromocresol green (BCG), broxylenol blue (BXB), bromophenol (BPB), (BPR), thymol (TB), xylenol (XO), phenol (PR) used as indicators. specificity changes in functions NH3 them was revealed. It found that color initial samples significantly depended not only structure Ind, but also nature hydroxy being part them. colors OEDPA (Ind = CoR, BCG, BPB), CA TrOOO, BPB, BPR, XO) some MA (TrOOO, BCG) are similar to Brönsted acids. difference other from strong same Ind is apparently due specific interactions between anions neutral dye forms. During (Ind: MO, Az BPR), MR, BXB, TB, PR) LA, Az, XO, discolored contrast SO2 indicator chemisorbents.