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2. Instruments and Reagents

2.1 Instruments and Equipment

2.1.1 Testing Instruments

2.1.2 Sample Pretreatment Equipment

2.2 Reagents

2.2.1 Raw Reagents

2.2.2 Prepared Reagents

2.3 Reference Standards

2.3.1 Stock Solution

3. Result Calculation

• X = Copper content in the sample, unit: milligram per kilogram (mg/kg);
• ρ= Mass concentration of copper in the sample test solution, unit: microgram per milliliter (μg/mL);
• ρ0= Mass concentration of copper in the blank solution, unit: microgram per milliliter (μg/mL);
• 에프 = Dilution factor of the digested sample solution;
• V = Total volume of the digested sample solution, unit: milliliter (mL);
• 중 = Mass of the sample, unit: gram (g).