Ammonium Ion Sensor
- 产品介绍
- Typical experiment
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Introduction
♦ Ammonium Ion Sensor consists of sensor and gas sensitive electrode. It is used to measure the concentration of ammonium ion in solution. The solution to be measured should be adjusted to pH higher than 11 by using sodium hydroxide. Sensor respond time is 5-10s.
Usage
♦ Connect probe to Ammonium Ion Sensor. (The probe has been assembled during manufacture. If it is broken during using, you can assemble it again. The procedures are shown below: place the electrode membrane into the probe front cover. Cover the silicon rubber gasket onto the top of probe. Screw the probe front cover onto the probe tightly so that electrode membrane is griped between silicon rubber gasket and front cover. Inject the filling liquid into electrode using syringe. Fill two out of three of the electrode. Place the electrode into the probe slowly to keep the electrode touching the electrode membrane. Screw the probe back cover onto the probe back. When the probe back cover reaches thread of probe, pull the electrode wire few times softly so that the air bubble rises to the top part of filling liquid. Screw tight the probe back cover.)
♦ Mount the electrode on iron stand. Make sure it aims downward.
♦ Rinse the probe: place the beaker with distilled water on magnetic stirrer disk. Immerse the probe into distilled water completely. Rinse it during stirring until the reading becoming stable (12-22mV). The distilled water can be changed during rinsing to speed up the procedure.
♦ Check if the electrode membrane is assembled properly: drop saturated sodium hydroxide solution into distilled water during last procedure (1 drop/50ml). Wait until the reading becoming stable. If the reading is higher than -50mV, it means the electrode membrane is assembled properly.
♦ Connect electrode to sensor, datalogger and computer.
♦ Open SWR iLab. The sensor has been calibrated before manufacturing.
♦ Immerse the probe into solution. Collect data using software.
♦ Discard the filling liquid after experiment. Rinse the probe using distilled water or deionized water. Dry it using filter paper. Cover the probe and preserve it in bag.
Notes
♦ The pH value of sample should be more than 11.
♦ If the experiment takes long time to complete, you should airtight the container in case ammonia gas evaporation.
♦ The temperature of standard and sample solution should be same.
♦ If the probe is used next day, you should screw off the probe back cover and pull the electrode to refresh the filling liquid.
♦ If the probe is left unused for long time, disassemble it and rinse all parts. Preserve them in clean and dry place.
