Low reading of standards

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Munib Ahmed Shafique
Munib Ahmed Shafique's picture
Low reading of standards

I am working on Thermo icap 6000 series ICP-OES. For the last few days the machine is continously giviging values of standards on the lower side. like 1 ppm is giving values around 0.5 to 0.3 pmm for almost every element. the same goes for 5 ppm , 10 ppm standrads.how can i overcome this issue