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Indicator reagents are used in testing because they undergo a chemical reaction which changes their color, making visible confirmation possible. I agree that it is a tedious process.
My 5 cents because I tested ions selective electrodes three years ago (many different ).
My few thoughts:
1. ions selective electrodes can't be use in continuous mode - after measurement they should be flushed . They have limited lifetime(depending from construction some parts can be replaced - like membranes ).
2. . The ion-selective electrode works based on the principle of a galvanic cell. It consists of a reference electrode, ion-selective membrane and voltmeter.
The ion-selective electrode works based on the principle of a galvanic cell. It consists of a reference electrode, ion-selective membrane and voltmeter.
The transport of ions from an area of high concentration to low concentration through the selective binding of ions with the specific sites of the membrane creates a potential difference.
This potential is measured with respect to a stable reference electrode having a constant potential, and a net charge is determined. The difference in potential between the electrode and the membrane depends on the activity of the specific ion in solution.
The strength of the net charge thus measured is directly proportional to the concentration of the selected ion.
The electric potential can be calibrated by direct means, standard additions and titrations. However, direct calibration is the most common means of measuring concentrations.
Long story short - for proper work they require reference electrode - which measure amount of ions in liquid(know parameters - like Ca 400) and that is compared to measurement taken from main probe. On the photo I can see one electrode and one cable which not look like electrode which can be replaced (it's rather power cable - looking on shape).
Question is - where are reference electrodes for Ca/Mg/K and No3? How they are calibrated inside the device without changing liquid before each measurement? I can't see that on the photo - or we are talking about completely different device(not from the photo).
3. Multi-ions electrodes are not precise like single ion electrode. I doubt about 2% precision.
All above what I said is based on my experience - same like we tested ion selective membranes(and decided to not use it in our projects) - we tested also method for measuring pCO2(dissolved carbon dioxide in water - using infrared sensors) and knowing pH - calculate alkalinity. For measuring pCO2 we were using special membranes(which slew for transfer CO2 gas from water to testing chamber ) which was precise - but for maintenance and long term use - very not practical (and hard to service by Customer).
I wish everybody that product like this will be released soon - but that what we are looking for is something completely different than this what was described. Additionally - nobody say about cost and lifetime of this electrodes ;-)
From technical point of view - of course everything is possible, however not for that kind of money(until they will not focus only on direct sale - manufacturer to Customer). Having national distributors, wholesalers, shops and other "distribution levels" - we can forget about 450 euro price(retail).
I can bet for a good bottle of whiskey ;-)
Have a nice weekend!
Przemek
My name is Mikel and I am the CEO of the Xepta company. Thank a lot of for your interest in our products.
buy a good bottle of whiskey, I accept the bet! for your statements, I think you´re a little lost with this measurement technique, I don´t give many details because I´ve seen this week GHL has copied our idea and I imagine that they will start with the development, you can see autoBalance and aBex in Reef a Palooza at the Coralvue stand.
I wish you made a stand alone unit .
Hello,
sorry, aBex need autoBalance, isn´t independent unit
I´ve seen this week GHL has copied our idea and I imagine that they will start with the development