Sodium Standard solution preparation
Sodium Standard Solution (1000 ppm Na):
Dissolve a quantity of anhydrous sodium carbonate equivalent to 2.305 g of Na2CO3 in a mixture of 25 mL of water and 25 mL of nitric acid and dilute to 1000.0 mL with water.
Sodium Standard Solution (200 ppm Na):
Immediately before use, dilute with water to 10 times its volume a solution containing sodium chloride equivalent to 0.509 g of NaCl in 100.0 mL.
Sodium Standard Solution (50 ppm Na):
Dilute the sodium standard solution (200 ppm Na) to four times its volume with water.
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