Low sensitiviy and change in cps through time ICP-MS 8900


From a year till now, every time we measure, whether in LA-ICP-MS or in liquid mode, sensitivity is not good.

Furthermore, relationship between masses differ a lot through time (like, 3 or 4 hours).

Agilent Argentina does not provide useful help and takes months to respond.

We cleaned lenses, torch, nebulizer and the cones seem in good shape.

Only thing we didn't touch is the reaction cell.

Maybe something of the tuning could improve, or may this be hardware realted?

This is the last standard tune (the one that runs at starting plasma, we do this every week using 1 ppb of masses Li, Mg, Ce, Co, Y, Tl)

And this is the specific tuning for solution 1 ppb of same elements of before plus 1 ppb U, Th, Pb (also note that uses He mode)

Any lead could be useful, thanks.



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