Panreac Quimica

The indicator substance for iron determination is Tiron [4,5-dihydroxy-l,3-benzenedisulfonic acid, disodium salt] (Acros Organics, Geel, Belgium). The stock solution used to prepare the calibration samples contains Ig Fe/L (solution of Fe(N03)3-4aq in HNO3 0.5N) (Panreac Quimica, Barcelona, SP). 

Methanol (HPLC grade) was obtained from Seharlau Chemie (Barcelona, Spain). Gelatine (300 bloom, A type) was supplied by Sigma Aldrieh (St Louis, USA). Sunflower oil and chicken meat were obtained from a local supermarket and sodium ehloride was from Panreac (Pameac Quimica S.A., Barcelona). 100 pm PDMS SPME stationary phase was provided by Supelco. 

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