ICP-MS (low counts for Be & Mg)

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Jigar Gandhi
Jigar Gandhi's picture
ICP-MS (low counts for Be & Mg)

hi,  I am currently new to the forum discussion. Currently I am having issue with PE ICP-MS (NexIon 300X) with low Be & Mg counts. I have been working with the ICP-MS for more than 3 yrs. I am having this issue since last 2 weeks. Me & PE Tech did all the necessary optmizations, we also replaced the detector, autolens & RF generator; still the counts for Be (500 to 700) & Mg (7000 to 9000) are very low. My passing specs for Be is >1800 & Mg is > 13500. I even tried replacing torch, injector, spray chamber, nebulizer & all the interface cones, still the same result. we also tried optimizing all the voltages for autolens, detector, Cell Ent/Cell Exit, etc still no changes in Be & Mg counts. I have also noticed my Neb flow is decreasing. Earlier it used to work with flow 1.02 to 1.05, but now its working from 0.98 - 0.95Desperately need some help.