Cs,Th,Ta and U to be analyzed on ICP OES 5100.

Can anyone tell me how to analyze trace metals (Cs,Ta,Th and U) on ICP-OES. Actually the problem is that i have been trying to analyze these four elements with different wavelengths but unable to find accurate results. For example in the case of cesium blank intensity is higher than the calibration standards that's why i am unable to read its peak and Ta,Th and U are giving higher results of CRM producing 200ppm but actual results is 4.73 ppm. i am unable to understand why is the instrument producing higher results as we know Ta,Th and U are not found in higher ppm in geochemistry samples.

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