The sensor is designed with ion selective electrode. It is a kind of electrochemistry sensor which measures ion activity and concentration in solution using membrane potential. When it touches the solution with ion to be measured, membrane potential will be generated between its membrane and solution. Ion selective electrode is also called membrane electrode. There is a layer of special electrode membrane on the electrode which response to specific ion. The relationship between potential of electrode membrane and ion to be measured compliance with Nernst formula. The circuit of sensor converts potential to analog signal.
Specification
| Range |
4.6~4600ppm |
|
Resolution |
.5 ppm |
Usage
Connect Nitrite Ion Sensor to any port in SenseDisc.
Connect probe to Nitrite Ion Sensor. Demarcate and use it.
Rinse the probe using distilled water after measuring. Dry the probe using filter paper. Cover the probe and preserve it in bag.
Typical experiment
Concentration of nitrite in solution
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Detect nitrite in water
Note
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To maximize the service life and best function, it is suggested that preserve the probe in fridge and temperature around 5ºC.
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When measuring concentration of nitrite in solution, you should configure two kinds of nitrite solution to demarcate. Try to configure nitrite solution which has same concentration as the solution to be measured in order to increase accuracy.
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Stable time: at least 5 minutes. Best PH range: 4.5-8. Temperature range: 5ºC-50ºC. Best temperature: 25ºC.
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The following ion will interrupt nitrite (the coefficient is shown in bracket): acetate (0.001), fluorinion (0.0008), chloridion (0.00005), nitrate (0.00001), sulfate radical (0.00001). The error will occur only when concentration of these matter is several times of nitrite. For example, when the concentration of chloridion is same as nitrite, the effect is only 0.005%. To make the effect up to 5%, the concentration should be 1000 times of nitrite.
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The effect of cyanide is very significant. It is forbidden to exist or only accepted to exist when its concentration is far lower than nitrite.
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The electrode filling liquid should be injected before using every time. It is suggested to discard it if the sensor will not be used in short period of time. Otherwise it will evaporate.
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