ICP-OES 725 ES

Question

Hey there, i&acute;m working with the ICP-OES 725-ES and i have to detect Ca,Mg,K in a 5% Nacl matrix. The icp won&acute;t detect kalium correctly so i have to dilute the samples 1:2 (50%). But if i do it i don`t reache the limit of determination. I show the method in the picture below maybe anyone can tell me

cheopark · Accepted Answer

5% NaCl solvent is hard matrix for ICP-OES. It could be made EIE and contamination. 
 First step, We need to check dark current, wavelength calibration, torch alignment. it must be normal result. 
 I recommend ASA( Argon saturation Accessory) and adjust torch height for good optimization position in condition tab. 
 If from 0.1 to 1.0 ppm range is bad, it was no reason for detection limit about 0.25 ppm.

ICP-OES 725 ES

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