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Guru
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Ion specific sensors

05/26/2007 5:50 PM

I see that ion specific sensors are V expensive.

Anyone got any whacky ideas or theories for a cheap way to sense Cu2+ ions in water (at low concentrations)?

This is a work related query, so don't give away your IP !

I Just wondered if there are any theories I could play with...My discipline is electronics and mechanics rather then chemistry ... but I'll have a dabble with anything.

Del the (curious) Cat

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#1

Re: Ion specific sensors

05/26/2007 9:03 PM

Hi Del,

How low?

While you're answering, I'll see what I can come up with.

Mike

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Guru
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#2
In reply to #1

Re: Ion specific sensors

05/27/2007 4:02 AM

Ta,

I'll get back to you on that when I'm back at work...Tuesday.

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#6
In reply to #1

Re: Ion specific sensors

05/29/2007 7:25 AM

Hi,

Back at work today.

We are looking to measure values upto about 1ppm. (expected range 0.4 - 0.8 ppm)

Del

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#3

Re: Ion specific sensors

05/27/2007 5:40 PM

Here is some thing I found after a quick search.

I tend to measure copper in the low mg/l and µg/l ranges so color-metric measurement such as the Hach pocket kit is the best method for my application. I would love to install a APA 6000 Low Range Copper Analyzer to reduce chemical exposure to the techs that pull hourly samples but even with a 30% corporate discount the bean counters don't want to spend the money.

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#4

Re: Ion specific sensors

05/27/2007 11:51 PM

I don't have much of a background in anything related but since copper is such a good conductor it seems like the impedance of the solution would be somewhat inversely proportional to it's concentration. I'm sure that's probably wrong but it's the only thing I came up with.

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Guru
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#5
In reply to #4

Re: Ion specific sensors

05/28/2007 4:02 AM

Thanks for the response, but I already use a conductivity sensor (2 stainless steel pins with a short 5v pulse to sense conductivity) but too many other chemicals effect this sensor.

Dunno if just having different metal for the electrodes woould help...or different pulse time?

Del

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