ICPOES 5800 wavelength calibration solution orgaic

Hello Sophia,

Wavelength calibration for organic samples can be completed using a multi-element standard that has these elements present at a minimum concentration of 5 mg/kg in a suitable solvent (such as Agilent A-solv solvent or kerosene):
Al, Ba, Ca, Cd, Cr, Cu, Fe, Mg, Mn, Mo, Ni, P, Pb, Sn, Ti, Zn.

The most common way to prepare this is to use one of the Agilent A21 Wear metal standards (with or without K) such as those shown below:
5190-8603 A21 wear metal standard, Ag, Al, B, Ba, Ca, Cd, Cr, Cu, Fe, Mg, Mn, Mo, Na, Ni, P, Pb, Si, Sn, Ti, V, Zn 100 µg/g, in 75 cSt hydrocarbon oil, 100 g
5190-8604 A21 wear metal standard, Ag, Al, B, Ba, Ca, Cd, Cr, Cu, Fe, Mg, Mn, Mo, Na, Ni, P, Pb, Si, Sn, Ti, V, Zn 300 µg/g, 100 g
5190-8605 A21 wear metal standard, Ag, Al, B, Ba, Ca, Cd, Cr, Cu, Fe, Mg, Mn, Mo, Na, Ni, P, Pb, Si, Sn, Ti, V, Zn 500 µg/g, 100 g
5190-8706 A21 wear metal standard, Ag, Al, B, Ba, Ca, Cd, Cr, Cu, Fe, Mg, Mn, Mo, Na, Ni, P, Pb, Si, Sn, Ti, V, Zn 900 µg/g, 100 g

Hope that helps you,
Cheers Eric

Hey Eric,

We have a MP-AES we use only for organic are also using that 21 Agilent standard.  When diluted in kero it goes in the machine at about 10 ug/g.  can we use that or would you recommend another concentation?  Machine is fairly new and we haven't actually done the calibration since it was installed. 

Michael

Hey Eric,

We have a MP-AES we use only for organic are also using that 21 Agilent standard.  When diluted in kero it goes in the machine at about 10 ug/g.  can we use that or would you recommend another concentation?  Machine is fairly new and we haven't actually done the calibration since it was installed. 

Michael

Hello Michael,

We would normally prepare the dilution of the 21 element Agilent standard so that the elements were there at a concentration of 5ppm (by weight) or 5ug/g. So the standard you have at 10ug/g is a little higher in concentration than required.

You could still use it - but it would be better to prepare a lower concentration for the next time you need to do the calibration.

Hope that helps you,

Cheers Eric

Hi Eric, Sorry for the late reply, the system didn't notify me that you had responded.  Thank  you.   Its good that we we can use the A21+K multi element standard  we already use Agilent Part no 5190-8712 .  Coincidentally the method we have developed has a CCV at 50 ug/g in oil which is diluted 1:10 with solvent, which is rather convenient.  

We have had some debate about this.  One of the points is that in MP-Expert - Instrument - Calibration - the calibration is looking for Strontium, which isn't present in the A21+K multi element standard, but all the other six lines it is looking for are.     I don't see this a problem because strontium is in the middle of the range at 407.7.  Does this flip the machine out at all?

Hello Michael,

It's kind of a yes and no answer.
Technically, the wavelength calibration will have failed because the strontium wavelength was not found - so you will see this if you check the results.
Practically this is unlikely to impact operation if all the other wavelengths have been identified.

If this is a concern, then it would be necessary to add strontium into the A21+K multi element standard when preparing the 5ppm concentration.

Hope that addresses your question,
Cheers Eric

Thanks  - I think we will just try it and let you know.   Would lack of wavelength calibration be the cause of the red line not lining up with the peak?  Seeing that a lot across the elements and its not always the same.  This wavelength chosen due to high concentration of Ca in engine oils.  When you pick it up and move it onto the peak it usually makes almost no difference - Auto Background correction.

. 

Hello Michael,

Lack of wavelength calibration may well be contributing to this issue.
But I should also check with you about whether you power down the instrument or not.
If you have not done this for a while, then you should do this and see if that helps improve the peak identification.

At power up, the instrument completes a zero order check which provides a datum for the wavelength drive. If this is "off", then you may see issues with peak identification even if the wavelength calibration has been completed.

Hope this helps you,

Cheers Eric