AOAC SPIFAN Nutrients ERP (December 7, 2022)

For ERP/Working Group Use Only DO NOT DISTRIBUTE Fluor-04 (SLV) Resubmission FOR ERP USE ONLY DO NOT DISTRIBUTE

Table III: Fluoride Calibration Curve Data – Low Curve

LOW CURVE (0.02 - 0.1 ppm)

Electrode 1

Electrode 2

Correlation Coefficient

Correlation Coefficient

Slope

Intercept

Slope

Intercept

Day

1 2 3 4 5 6

0.99478 0.99720 0.99685 0.99657 0.99675 0.99681 0.99649

-39.2677 -40.9080 -40.8552 -41.1607 -41.4772 -41.0235 -40.7821

104.9801 102.8541 101.6818 101.2695 102.5431 103.0857

0.99606 0.99737 0.99756 0.99674 0.99633 0.99718 0.99687

-39.8019 -41.0964 -41.2881 -41.1867 -41.4304 -40.6694 -40.9121

93.4542 91.2122 90.6460 91.4361 91.1833 92.3604

AVG RSD

0.09

0.06

Table IV: Fluoride Calibration Curve Data – High Curve

HIGH CURVE (0.1 - 2 ppm)

Electrode 1

Electrode 2

Correlation Coefficient

Correlation Coefficient

Slope

Intercept

Slope

Intercept

Day

1 2 3 4 5 6

0.99983 0.99974 0.99973 0.99953 0.99977 0.99962 0.99970

-55.6448 -55.7749 -56.0211 -55.4831 -55.9670 -55.6385 -55.7549

87.9459 87.8476 86.4229 87.0059 87.9096 88.4149

0.99982 0.99960 0.99975 0.99958 0.99958 0.99967 0.99967

-55.8592 -55.7505 -55.8166 -56.4211 -55.6595 -55.7348 -55.8736

77.0997 76.5567 76.0155 76.2911 76.8571 77.2792

AVG RSD

0.01

0.01

LOD/LOQ AOAC Appendix E: Laboratory Quality Assurance gives alternative ways to determine LOD/LOQ based on data collected by blank measurement. The data generated by both electrodes on the daily blank replicates were analyzed, and LOD and LOQ were calculated as follows: = ̅ + 3 ∗ = ̅ + 10 ∗

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