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Requirements of NaCl

Requirements of NaCl

Requirements of NaCl

(OP)
Hi,
Can somebody enlighten me on the requirement of chemical composition for NaCl.The grade I'm looking for is extra pure and ASTM B 117 specifies that the salt used shall be free of nickel and cooper and contains not more than 0,1% of sodium iodide and max 0.3% of total impurities.I need to know how to establish other elements/compounds not specified.These are required for Salt Spray analysis for Sulfuric acid and Chromic acid anodizing(AMS 2470 & 2471).Thanks for advise.

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