Sherman is a city in and the county seat of Grayson County, Texas, United States. The city's estimated population as of 2009 was 38,407. It is also one of two principal cities in the Sherman-Denison Metropolitan Statistical Area. The City of Sherman was named after General Sidney Sherman (July 23, 1805 â August 1, 1873), a hero of the Texas Revolution. The community was designated as the county seat by the act of the Texas legislature which created Grayson County on March 17, 1846.
A standard curve is a type of graph used as a quantitative research technique.Multiple samples with known properties are measured and graphed, which then allows the same properties to be determined for unknown samples by interpolation on the graph.o analyze the data, one locates the measurement on the Y-axis that corresponds to the assay measurement of the unknown substance and follows a line to intersect the standard curve. The corresponding value on the X-axis is the concentration of substance in the unknown sample.
A standard solution is a solution in which the analyte concentration is accurately known. The absorbances of the standard solutions are measured and used to prepare a calibration curve, which in this case is a plot of absorbance vs concentration. The points on the calibration curve should yield a straight line. The unknown solution is then analyzed. The absorbance of the unknown solution is used in conjunction with the calibration curve to determine the concentration of the analyte. The data obtained from the standard are used to plot a straight line. The slope and intercept of that line provide a relationship between absorbance and concentration: A = slope c + intercept. The absorbance of the unknown solution, Au, is then used with the slope and intercept to calculate the concentration of the unknown solution, cu.