ICP-MS analyzing process

Hello Agilent Community!
I have an interesting question for you about ICP-MS. So, a blood test is carried out, calibration is done at 5 points, then this calibration line is checked by a controller (CRM), everything coincides with the certificate data. But when we start reading the sample, with some elements (for example aluminum), a negative result is obtained. What is the reason for this?

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