• British Pharmacopoeia Volume IV
  • Appendices
  • Appendix I C. Standard Solutions

Calcium Standard Solution (10 ppm Ca)
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Calcium Standard Solution (10 ppm Ca) Immediately before use, dilute with distilled water R to 100 times its volume a solution in distilled water R containing calcium carbonate R equivalent to 0.624 g of CaCO3 and 3 ml of acetic acid R in 250.0 ml.