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I have been trying to analyse halogens (five chemically related elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At)) in soil & sediment samples at LLDs 0.5 ppm for iodine, 15 ppm for chlorine. I am able to get reproducible results for iodine above 1.5ppm & in case of chlorine reproducible results are observed in samples having concentration 50ppm or more. In case of pellets of samples having chlorine concentration less than 50 ppm enhancement of signal/concentration was observed with every exposure untill the pellet gave a value of 50ppm, thereafter it remained stable. I am using methyl acrylate in acetone(5% solution) as binder.