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El�bi 1111 Page -19- SPIKING OF SAMPLES FOR EPA METHOD 3050 EXTRACTION Parameter Preparation Yield Antimony Add 1.0 mL of 250 mg/L standard 2.5 mg/L to 5 g of sample, extract with nitric acid, dilute to 100 mL Arsenic Add 1.0 mL of 250 mg/L standard 0.75 mg/L to 5 g of sample, extract with nitric acid, dilute to 100 mL Barium Add 1.0 mL of 250 mg/L standard 2.5 mg/L to 5 g of sample, extract with nitric acid, dilute to 100 mL Beryllium Add 1.0 mL of 10 mg/L standard 0.1 mg/L to 5 y,, of sample, extract with nitric acid, dilute to 100 mL Cadmium Add 1.0 mL of. 10 mg/L standard 0.1 mg/L to 5 g of sample, extract with nitric acid, dilute to 100 mL Chromium Add 1.0 mL of 250 mg/L standard 2.5 mg/L to 5 g of sample, extract with nitric acid, dilute to 100 mL Cobalt Add 1.0 mL of 250 mg/L standard 2.5 mg/L _. to 5 g of sample, extract with nitric acid, dilute to 100 mL Copper Add 1.0 mL of 250 mg/L standard ?.5 mg/L to 5 g of sample, extract with nitric acid, dilute to 100 mL Lead Add 1.0 mL of 100 mg/L standard 1.0 mg/L to 5 g of sample, extract with nitric acid, dilute tc 100 mL Mercury Add 2.0 mL of 1.0 mg/L standard 0.02 mg/L to 5 g of sample, extract with aqua regia, dilute to 100 mL Molybdenum Add 0.5 mL of 1000 mg/L standard 5.0 mg/L to 5 g of sample, extract with nitric acid, dilute to 100 mL Nickel Add 1.0 mL of 100 mg/L standard 1.0 mg/L to 5 g of sample, extract with nitric acid, dilute to 100 mL Selenium Add 1.0 mL of 20 mg/L standard 0.20 mg/L to 5 g of sample, extract with nitric acid, dilute to 100 mL