Not in EPA 1664A/B. For use lab Initial prepared standards and D7575: cal. Holding analyze at or after 28 stds. read back Time/ days. Do not use within +/-5% of Sample Prep Calibration true. Verified Standard Devices lin. cal. range Verification (CSD). Initial prior to and current cal. Study analysis: 200; 160; 120; 80; 40; 4; 1 mg/L. EPA 1664A/B: Initial prior to analysis; +/-10% at 2 mg, EPA 1664A/B; 2, 1000 +/-0.5% at 1000 Initial mg mg. Calibration D7575: 200; 160; 120; D7575: cal. Stds. 80; 40; 4; 1mg/L or stds. read back CSD. within +/-5% of true. Permit Conc. Limit for Analyte† Calibration D7575: <1 Not in EPA 1664A/B Blank mg/L EPA 1664A/B: <5 mg/L. D7575: <MDL Method One each batch of 20 or <10% of Blank samples known conc. of associated test samples EPA 1664A/B: Before and after batch: +/-10% at 2 mg, EPA 1664A/B; 2, 1000 +/-0.5% at 1000 Stial Cal. mg mg. Verification D7575: OPR at 40 D7575: OPR mg/L, do not use reads back CSD. within +/-5% of true. EPA 1664A/B; Before and after batch: +/-10% at 2 mg, EPA 1664A/B: 2, 1000 +/-0.5% at 1000 Continuing mg mg. Cal. D7575: OPR at 40 D7575: OPR Verification mg/L, do not use reads back CSD. within +/-5% of true. Ongoing Precision & One per batch; 40 HEM Recovery: Recovery mg/L. 78-114% (OPR)
Initial Holding Time/ Sample Prep Verification Study Not in EPA 1664A/B. For use lab prepared standards and analyze at or after 28 days. Do not use Calibration Standard Devices (CSD). Initial prior to analysis: 200; 160; 120; 80; 40; 4; 1 mg/L. D7575: cal. stds. read back within +/-5% of true. Verified lin. cal. range and current cal. Initial Calibration Stds. Initial prior to analysis; EPA 1664A/B; 2, 1000 mg D7575: 200; 160; 120; 80; 40; 4; 1mg/L or CSD. EPA 1664A/B: +/-10% at 2 mg, +/-0.5% at 1000 mg. D7575: cal. stds. read back within +/-5% of true. Permit Conc. Limit for Analyte† Calibration Blank Not in EPA 1664A/B D7575: <1 mg/L Method Blank One each batch of 20 samples EPA 1664A/B: <5 mg/L. D7575: <MDL or <10% of known conc. of associated test samples Stial Cal. Verification Before and after batch: EPA 1664A/B; 2, 1000 mg D7575: OPR at 40 mg/L, do not use CSD. EPA 1664A/B: +/-10% at 2 mg, +/-0.5% at 1000 mg. D7575: OPR reads back within +/-5% of true. Continuing Cal. Verification Before and after batch: EPA 1664A/B: 2, 1000 mg D7575: OPR at 40 mg/L, do not use CSD. EPA 1664A/B; +/-10% at 2 mg, +/-0.5% at 1000 mg. D7575: OPR reads back within +/-5% of true. Ongoing Precision & Recovery (OPR) One per batch; 40 mg/L. HEM Recovery: 78-114%