As a result of experiments, it was found that the concentration of the substance, 0.01, 0.03 standard 0, 0.05, 0.07 ppm on average three times a fluorescence value equals 28456, 60006, 72110 and 93285 40875, respectively. Best Blank and Sample fluorescence value equals 25738 and 73823 respectively. Standards with standard deviation equal to 642, 975, 2340, 1802 and 4014, respectively. The% CV values is equal to 2.2, 2.3, 2.4 and 4.3% and 3.8, respectively, and when the concentration of the standards, and the Fluorescence to the standard graphing linear graph the value found is the linear equation y = 910183x + equal and in the Sample with the amount of 30625 khe nakhon of salicylate ion is equal to 0.047 ppm.
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