Aquion Detector Cell Certificate Clarification

Issue

There has been recent confusion regarding the detector cell certificate specifications for the Aquion. On the detector cell certificate, the specification for correlation coefficient is listed as ">= 1.00" with a measured of value of "0.999...."

The correlation coefficient as defined in Chromeleon is:

"The linear Correlation Coefficient variable calculates the "linear dependence" between two variables (for example, the peak area and the amount (concentration) of an analyte. It can range from –1 to +1 (-100% to +100%). Use the coefficient of determination if you are using either non-linear calibration curves or a linear calibration curve forced through the origin.

If all data points are located on a straight line, the correlation coefficient is exactly +1 or -1 (or ±100%). If the data points are scattered very much, the coefficient approximates 0."

This indicates that a value greater then 1.00 should not be possible.

Environment

• Aquion IC

Resolution

The correct specification for the Pass/Fail criteria is ">=0.999."  The summary report formatting for the certificate applied rounding of the value to only 2 digits, therefore only "1.00" is displayed on the certificate.