The reference in enology
since 1855

PRINCIPLE

A standard sodium hydroxide solution is poured into the distillate obtained from steam distillation with some additional drops of phenolphthalein until it turns pink. In the presence of sulphurous acid (SO2) in the wine, the value found above is slightly in excess. It can be easily corrected by running an iodometric titration with a standard solution on the sample which has just been neutralized.

EQUIPMENT AND REAGENTS

• 2 automatic self-zeroing burettes (25ml - 1/10) (Ref. 600145)
• 1 crystallizer (100ml - 70mm diameter) (Ref. 627070)
• 2 security clips (Ref. 600195)
• 2 ground-joint flask heads (Ref. 600194)
• 2 amber glass ground-joint flasks (500ml) (Ref. 600145)
• 2 bulbs for automatic self-zeroing burettes (Ref. 606000)
• 1 pipette (10 ml - 1 mark) (Ref. 602010)
• 2 VERSILIC hoses (5/7 diameter) (Ref. 617602)
• 1 base (Ref. 600910)
• 1 rod (Ref. 600921)
• 1 clamp for two burettes with nut (Ref. 600905)
   
• Phenolphthalein, 60ml (Ref. 938060)
• Acidimetric solution, 500ml (Ref. 902500)
• Bromothymol blue, 60ml (Ref. 940060)
• Iodide/Iodate N/50, 500ml (Ref. 924500)
• Sulphuric acid, 250ml (Ref. 932250)
• Indicator, 125ml (Ref. 937125)