Boron analysis by GFAA

Hi, I'm having trouble with boron analysis on my 240Z GFAA; I'm trying to reproduce conditions for the AA125 application notes, but I can't seem to get consistant signal. I'm using pyroliticaly coated partitionned tubes and a zirconium nickel matrix modifier, but in 5 analysis the signal seems to drop by 25%. Any tips?

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