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I am reading the ICP ASTM D4951 method, i have questions:

1. For preparing Internal Std with Cobalt, 10ppm to 20ppm is recommended, can explain the theory behind? I have VHG Co 6% and kerosine now.

2. How to prepare calibration standards and samples 1-5 mass% oil in solvent? I have V23 900ppm standard and 75cst white oil.Can give example if the total weight is 10g.
Thank you.
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