Magnesium 1000 ppm Standard Solution is a precisely prepared aqueous standard used in instrumental calibration for atomic absorption spectroscopy (AAS), ICP-OES, and ICP-MS...
Sodium Standard for Atomic Absorption (AAS) 1000 g/mL in 1M Nitric Acid (HNO3) is manufactured from very pure metal or salt (at least 99.9%).

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This is because 1 ml of the 1000 ppm stock solution contains 1000 parts of solute in 1 million parts of solution, which is equivalent to 1 liter.
Such details provide a deeper understanding and appreciation for 1000 Ppm Standards.
TDS solution HM Digital 1000 ppm standardized using a conductivity meter calibrated with NIST potassium chloride.