Elemental sulphur spray – Part 2: Residues during winemaking

Elemental sulphur spray – Part 2: Residues during winemaking

Dr. Carien CoetzeeBasic Wine30 September 2021   Elemental sulphur (S0) plays an important role in powdery mildew management during the growing season. However, several reports have shown that S0 residue concentration of more than 10 μg/g in the must can result in...
Removing copper-H2S complexes using membrane filtration

Removing copper-H2S complexes using membrane filtration

Dr. Carien Coetzee Basic Wine 30 June 2020 FOCUS ON H2S: Part 6 The entire Focus on H2S series has highlighted the importance of removing the copper-H2S complex from wine, especially in cases where copper was added as a remedial treatment for the removal of reductive...
Removing copper-H2S complexes using PVI/PVP

Removing copper-H2S complexes using PVI/PVP

Dr. Carien CoetzeeBasic Wine28 June 2020 FOCUS ON H2S: PART 5 In Part 1 of this Focus on H2S series, the implications of fining a reductive wine with copper(II)sulphate were discussed. Cu2+ will bind with H2S to form a copper-H2S complex, however, contrary to popular...
Copper and SO2 used together – effect on H2S

Copper and SO2 used together – effect on H2S

Dr. Carien CoetzeeBasic Wine20 May 2020   FOCUS ON H2S: PART 4COPPER AND SO2 USED TOGETHER – EFFECT ON H2S The mechanisms involved in the formation of hydrogen sulfide (H2S) post-bottling are not yet as well defined as those involved during fermentation. However,...