Measurement and Results - Elemental Impurities in Sodium Hydroxide
Josef Walser Total posts: 1
I wanna analyze elemental impurities in sodium hydroxide pellets for pharmaceutical industry via ICP-MS (NexION 350XX). But I have too high recoveries for some elements.
I dilute pistilled sodium hydroxide in water, acidify with nitric acid and spike with a multi-element standard, containing for example mercury, arsenic, lead, molybdenum and tungsten.
I result recoveries for 202Hg of 150 %, 75As 150 % and 182W 200 %. Other elements like lead, iron, zinc or copper have good recoveries.
Do you know where the problem is and what to do to get better results?