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December 27, 2022 <br /> SKS Enterprises Lab No. : STK2256517 <br /> Customer No. : 3013071 <br /> Quality Control - Metals <br /> MSRPD mg/kg 200.0 1.5%% <20 <br /> PDS mg/kg 40.00 131 % 75-125 430 <br /> Definition <br /> Blank : Method Blank- Prepared to verify that the preparation process is not contributing contamination to the samples. <br /> DQO : Data Quality Objective -This is the criteria against which the quality control data is compared. <br /> LCS : Laboratory Control Standard/Sample Prepared to verify that the preparation process is not affecting analyte recovery. <br /> MS : Matrix Spikes -A random sample is spiked with a known amount of analyte. The recoveries are an indication of how that sample matrix <br /> affects analyte recovery. <br /> MSD : Matrix Spike Duplicate of MS/MSD pair-A random sample duplicate is spiked with a known amount of analyted. The recoveries are an <br /> indication of how that sample matrix affects analyte recovery. <br /> MSRPD ; MS/MSD Relative Percent Difference (RPD) - The MS relative percent difference is an indication of precision for the preparation and <br /> analysis. <br /> ND ; Non-:detect -Result was below the DQO listed for the analyte. <br /> PDS : PDS failed, matrix - Post Digestion Spike (PDS) not within Acceptance Range (AR) because of matrix interferences affecting this analyte. <br /> Data was accepted based on the LCS recovery, <br /> Explanation <br /> 430 : Post Digestion Spike (PDS) not within Acceptance Range (AR)because of matrix interferences affecting this analyte. Data was accepted <br /> based on the LCS recovery. <br /> 435 : Sample matrix may be affecting this analyte. Data was accepted based on the LCS or CCV recovery. <br /> Page 4 of 4 Page 4 of 4 <br />