Copper, reagent kit for wine

12814

Colorimetric analysis for copper determination

Kit volume: 100 ml
Method: Two-reagent differential at 560 nm
Limit of linearity: 7 mg/l
Limit of detection: 0.4 mg/l (ppm)

Advantages

Stable liquid reagent until the expiration date
Ready-to-use dedicated reagent
Liquid calibrator included in the kit

Copper is a metal that clearly originates in the process of vinegrowing. The main source is phytosanitary treatments of vineyards to prevent mildew. During harvest, the copper content may be 4 to 6 mg/L. During fermentation its concentration decreases to 0.2-0.3 mg/L due to the formation of copper sulfides or the presence of yeasts that fix the copper contained in the medium.The OIV has set a maximum acceptable limit of copper of 1 mg/L.

Any copper in the sample reacts with 4-(3,5-dibromo-2- pyr- idylazo)-N-ethyl-N-sulfopropylaniline (PAESA). The color in- crease is directly proportional to the copper concentration of the sample.