I have a sample of treated water sample & asked to obtain ammonia conc. in sample using a machine with 5-25 ppm detection range. However, upon testing with different dilution factors, all calculated conc. shows different values (df 50 - 89.5 ppm & df 20 - 104.4 ppm). So, does using different dilution factors affect negatively on the values or there are other factors affecting those values ?

thank you for your time

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