From the graph to find the measure of each time relative to a standard value, the concentration values differ from the standard values in the range 0-10 ppm and 0-15 ppm.
From the graph to find the values measured in each compared to a standard concentration that is different from the standard range 0-10 ppm and 0-15 ppm.
From the chart, it is found that the measured values each time when compared to standard concentration values that differ from the standard in the 0-10 ppm. 0-15, and ppm