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

Arsenic Standard Solution (10 ppm As)
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Arsenic Standard Solution (10 ppm As) Immediately before use, dilute with water R to 100 times its volume a solution prepared by dissolving arsenious trioxide R equivalent to 0.330 g of As2O3 in 5 mL of dilute sodium hydroxide solution R and diluting to 250.0 mL with water R.