Four quality control samples were prepared by adding various amounts (0 μL, 10 μL, 20 μL, and 30 μL) of the standard solution mixtures (containing 100 mg/L Pb, 1 mg/L Cd, 10 mg/L Cr, 100 mg/L Cu, and 50 mg/L Ni) to quadruplication of tea sample 12 (0.25 g for each), respectively. The concentrations of the five heavy metals in QC samples were analyzed six times to determine the relative standard deviation and the recovery of the method. The recovery was calculated as shown in formula (1)). As listed in Table 3, the recoveries ranged from 97.2% to 101.1% for Pb, from 97.7% to 99.0% for Cd, from 98.4% to 102.3% for Cr, from 98.7% to 104.1% for Cu, and from 96.7% to 98.2% for Ni. The precision represented by relative standard deviation ranged from 1.7% to 6.5%.
ในการประเมินกระบวนการทั้งหมดที่ทำการตรวจสอบ มีการศึกษาโลหะหนัก 5 ชนิด
Four quality control samples were prepared by adding various amounts (0 μL, 10 μL, 20 μL, and 30 μL) of the standard solution mixtures (containing 100 mg/L Pb, 1 mg/L Cd, 10 mg/L Cr, 100 mg/L Cu, and 50 mg/L Ni) to quadruplication of tea sample 12 (0.25 g for each), respectively. The concentrations of the five heavy metals in QC samples were analyzed six times to determine the relative standard deviation and the recovery of the method. The recovery was calculated as shown in formula (1)). As listed in Table 3, the recoveries ranged from 97.2% to 101.1% for Pb, from 97.7% to 99.0% for Cd, from 98.4% to 102.3% for Cr, from 98.7% to 104.1% for Cu, and from 96.7% to 98.2% for Ni. The precision represented by relative standard deviation ranged from 1.7% to 6.5%.ในการประเมินกระบวนการทั้งหมดที่ทำการตรวจสอบ มีการศึกษาโลหะหนัก 5 ชนิด
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