1. Date 15 Nov 2021 (Mon) 40 Below is the test procedure testing of lead in food sample. 1. Prepare calibration standard

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1 Date 15 Nov 2021 Mon 40 Below Is The Test Procedure Testing Of Lead In Food Sample 1 Prepare Calibration Standard 1 (40.87 KiB) Viewed 54 times

1. Date 15 Nov 2021 (Mon) 40 Below is the test procedure testing of lead in food sample. 1. Prepare calibration standards - 2, 10, 20, 40 and 100ppm lead in 2% nitric acid. 2. 2g sample is digested using 2% nitric acid and hydrogen peroxide by microwave digester. 3. Dilute the sample to 50ml using Dl water 4. ICPAES analysis 5. A standard solution of different sources is used as a calibration check standard. 6. A CRM with certified value 2.01ppm is used as the laboratory control sample (LCS) (a) If there are 32 samples, how many laboratory control sample (LCS) should be performed? [2%) (b) (i) Refer to the test procedure: which solvent should the calibration blank be contained? ( 2% ] which solvent should the sample blank be contained? (2%) obtained 1691