Hi
I'm working in an Agilent 8900 instrument (no collision cell) measuring Cl in apatites by La-ICP-MS along with other masses as REE U-Pb.
I'm having problems with baseline substraction for Cl, which shows high CPS values on NIST_612 when compared with other experiment form a colleague which shows nearly zero values for the same glass (joint Pic)
besides this higher CPS count in my NIST-612 glass, after data processing my Cl ppm content from the reference material is about one order of magnitude lower.
does anyone knows how to correct this baseline substraction? perhaps an O/O interference
thanks for your feedback