Equilibration process l need pure salt solutions l problem of volatile contamination l large surface area to food l must be slurry - need excess salt l mixed type samples l takes time 7 to 21 days l vacuum fluxing l toxicity of salts - eg lithium , nitrite, iodide, bromideEquilibration process l need pure salt solutions l problem of volatile contamination l large surface area to food l must be slurry - need excess salt l mixed type samples l takes time 7 to 21 days l vacuum fluxing l toxicity of salts - eg lithium , nitrite, iodide, bromide