The objective is to study the appropriate storage duration of the fluoride standard solution can also be done by Selective Ion calibration curve for preparing Fluoride by substances from the Electrod melt 100 ppm fluoride concentration standards. A new calibration curve must be prepared. Every time you prepare a calibration curve to cause problems to shed both the chemicals and time. During the preparation of the fluoride concentration standards for calibration curve. Therefore, this research is interested in researching the possibility to solve it
.Materials and methods the study, for example, the concentration of fluoride 0.1 1.0 and 10.0 ppm, which is stored in a refrigerator at 4 degrees Celsius. Is a measurement of the amount of fluoride in each week until 9 weeks analyzing the sample quantity all came out with a fluoride Ion Fluoride Selective for Electrod? Calibration curve, measured fluoride from the stored samples. Save up to the average of the concentrations of fluoride. Then measure the quantity of fluoride in every week until it is due. SPSS version 16
Study results from the study found that fluoride at concentrations 0.1, 1.0 and 10 ppm in the extreme temperature of 4 degrees Celsius. In different periods. I found that by measuring the concentration of fluoride from starting until week 9 concentration of fluoride of 3 values (0.1, 1.0, and 10.0 ppm) when viewed from the Mean ± SD found that there are no changes in the week 1 to week 4, and it has changed noticeably in the week 5 and 9 of the 10.0 ppm fluoride concentration, with the Mean ± SD equivalent to 10.94 and 10.78 .055 ± ±.45 respectively
summary The average values of the test substance concentration soluble fluoride standards. 0.1, 1.0 and 10 ppm was found when the event is held here from Beijing's average and graphs found value in the range from the start until week 4 in the extreme temperature of 4 degrees Celsius is an appropriate time to be used in the creation of calibration curve. That such a test is a test that is supposed to control other factors that are involved here
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