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Dilution calculations

Im struggling with dilution calculations for the following write up, can someone help?

- Stock solution of KI/potassium iodate at 1000 μg I/g prepared with water and NaOH(1:4v/v) .
- Diluted with water to 1 μg I/g
- Te standard (1000 ug Te/mL in 2-3% HNO3) was diluted to 1 ug Te/g and further dilute to 100 ng Te/g before adding to samples

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