Identification of Ions in a Multiphase System?

Ions only exist in aqueous solutions.

You also have ions in a plasma. But this does bring up the question about identifying what media will these ions exist? Are these salt ions in an aqueous solution for a possible chemical reaction or is this part of an ion depositing technique (plasma) for semi-conductor fabrication?

My application is, i have a big chunk of salt and will pass a slurry (whose ions conc is known) at particular rate and time. Now the slurry will take some salt while its being pumped thorugh i could like to caprture and quantify the ions that are migrated to the slurry from the salt. Some where i came across a technique that when this aqueous soltion is subjected to the magnetic field the conductivity of the solution changes and by logging the amount of mV we can able to logg the migration of ions from salt into the slurry. I am not sure how feasible it is. Anyway, i have an another dooubt, this method will be able to say the change in ion conc as a whole but i am looking for change in conc of individual ions in the aqueous slurry.

Does it sounds sense?

Bala.

We do this all the time measured resistance at inlet and outlet and you will know how much is extra ionic pick up is as long as you know diffusion rate. We have for our boro silicate glass tubing and can say the leach rate.

Leach rate is depended on slurry chemistry, pH, temperature and flow speed. It will be hard to predict without having full information but if you need help I can provide you if you provide me information

Not always true. Ions exists in solid also and glass is prime example. sodium, lithium and potassium ions hops in solid glass. Under applied electrical field diffusion is directional and under non applied electrical field it is random

Ionic diffusion gave us atomic balance, ion exchange strengthening of glass bottle and melting silicate glasses at low temperature to manufacture bottle, window glasses and other critical applications which made our life little easier

Masyood ,

Thanks for the helping hand, my intention is to model the diffusion rate of individual ions under defined conditions of flow rate, temp and pressure. Here the difficulty is the presence of multiple ions in the source. Basicall the salt is a mixture of Na,K, Mg and Cl- etc. so common ion effect will come in to pictuer where initally the ions diffusion rate will be high where as the time goes on at the same conditions like flow rate ,tem and pressure the diffusion rate may drop and phase out due to the common ion effect . i could like to capture it for ever indiviual ion.

thanks ..Bala.

What you're asking to do seems to me to be more like a lab experiment. My opinion is that if this can be done "in situ" it cannot be done cheaply. In essence what you are asking for is a way to convert this slurry system into a liquid form of chromatography. In both paper and gas chromatography, the mass of the chemicals are what separate neutrally charged particles. You have ions in an aqueous slurry which will be heavily influenced by their ionization state instead of the momentum or gravity forces that differentiate the mass of these atoms. You certainly can identify the pH of this slurry as these salts dissolve but this will not give you any ion separation data. The only approach I can think of that you could identify the discrete ion concentrations in an aqueous solution at all is x-ray absorption spectroscopy. I doubt that you have the budget to build a synchrotron and monochromator for the x-ray source to do this.

Maybe someone with a better understanding of chemistry than I have can suggest another technique.

I am not sure what Bala has if he has in his lab ICP he can also do that by diverting small sample volume at time interval and performing ICP for individual ions he is talking about. If there is will there one will find way I have done initial experiments on coal and ash transportation by drawing slurry as it flow and monitoring flow rate and ionic contamination based on wet chemistry approach.

I am not sure but if Baba is motivated he will find way to connect wet chemistry or ICP to flow behavior and if he has money will go for X-ray monitoring system

I don't think that the International Center of Photography has any relevance here. As much as I enjoy their name, the rap of Insane Clown Posse has nothing to do with chemistry. (Well not this kind of chemistry.) What do you mean by ICP? Please define your acronyms.

ICP Ion couple plasma analysis what you do is take the liquid dilute it and then ionize it and go through analysis. One can also do AA on the solution and I can keep naming this . I do not know from where you have International center of photography. This center I am not sure has to do what for the analysis what we are talking about

Well if you had clicked on my link labeled ICP, you would've seen that Google first identifies ICP as the International Center of Photography. The OP likely does not know the jargon or acronyms of the field as well as you and your work colleagues because they are asking for help. This is why it is always a good idea to define all acronyms when they get introduced into a thread. This is particularly true because many acronyms have many possible roots but most of them will not make sense in context. Some acronyms are actually real words. If you don't identify that this is your chosen acronym you can make a sentence that makes no sense. Aa is a form of lava.

Lastly, taking samples of the slurry is not really an in situ technique as I had presumed was required. None the less your proposal of taking samples will likely be the method that will meet the real requirements.

It is okay. AA is atomic absorption spectroscopy. This may also work. I do not believe a drop is going to change the solution chemistry. If it does then make a note volume drawn and develop fudge factor to manipulate the bath. People do all the time

Hello Red,

You are correct i am looking for a lab setup. But i cant go for costly equipments like the one you are talking about.

ICP is "inductively coupled plasma mass spectroscopy"

Hello Masyood,

Actually, I have ICP in my lab. The slurry which i am talking about is going to set like a cement over a period of time and i was told that ICP can not take particle laden fluids for analysis so what we are doing rite now is digesting the slurry with HCL over a period of 8 - 10 hrs and taking the digested fluid for ICP analysis. THis is OK if we do it for a NON-Dynamic system but when we go for dynamic that means i need to circulate the same fluid to increase the contact time with the mixture of salt at the same testing conditions. So if I take out samples for ICP analysis my volume of slurry is bound to change which will alter my the test volume which will impact much on the salt dissolution.

thanks..Bala.

Well OK you do understand the acronym ICP.

Why not just filter out the liquids of the slurry for ICP analysis with filter paper? The ions will only reside in solution anyway.

good idea..but there is a MgOH formation in the solution due to the MgCl2 ions this MgOH tends to precipitate as a solid so if i filter i m gonna miss the Mg ions.

Yes, but I'm going to make a a linguistic argument back. If you have a precipitate that can be formed then these precipitates will form regardless of filtration. They will form in the slurry itself and the Mg ions won't be there anyway. You also will have plenty of time from taking the slurry sample for these plausible precipitates to form.

If you have ICP then make use of it. Mg ions precipitate so be it. You can redisolve and analyze it. There is lot of way you can do but doing within resources is the best way.

If you will be able to correlate the ICP with amp flow under applied voltage then you can have graph on x-axis amp and y-axis you ions concentration and process will be usable.

Just find a way or hire me as your technician and will make sure this happen.