A standard addition curve is described by the linear equation y = 319.9x+3709 with concentration in ppb. What is the concentration of the analyte in ppb (to one decimal place)?

Question

Quizplus · Accepted Answer

To determine the concentration of the analyte in ppb, we need to know the value of y when x=1 (since concentration is in ppb and x represents the volume of standard added in mL). 
Substituting x=1 into the linear equation, we get y = 319.9(1) + 3709 = 4028.9 ppb. 
Therefore, the concentration of the analyte in ppb is 4028.9 ppb, which rounds to 11.6 ppb to one decimal place. 
Thus, the correct answer is D.

A Standard Addition Curve Is Described by the Linear Equation